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CCH1:
Featuring California vascular plant data from the Consortium of California Herbaria and other sources
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Search Results
— 513 specimen records retrieved (224 records with coordinates)
Results for search: County=CONTRA COSTA; Source=All; Collector=Howell; Map/download results: BerkeleyMapper with layers and yellow flags |
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| Please cite data retrieved from this page: Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/cch_archive/). | |
| Records are made available under the CCH Data Use Terms. |
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Click on column header to sort data (* sorts by family); click in leftmost checkbox to select record. CCH Help Page.
A yellow cell in the column headed "?", for records with coordinates, indicates a discrepancy with respect to range as specified in the eFlora. Read more ... |
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| ? | Specimen ID | Determination * | Collector | Collection Date | Collection Number | County | Locality | Elevation in meters | Feedback | |
|---|---|---|---|---|---|---|---|---|---|---|
| CAS-BOT-BC104164 | Quercus X morehus | John Thomas Howell | 1925-10-11 | 1503 | Contra Costa | Chaparral, Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC104707 | Quercus wislizeni | John Thomas Howell | 1950-6-5 | 26637 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC11024 | Dendromecon rigida | John Thomas Howell | 1925-10-11 | 1497 | Contra Costa | Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC114612 | Cyperus eragrostis | John Thomas Howell; Gordon H. True | 1972-6-29 | 48936 | Contra Costa | Along ditches on Byron Hot Springs Road SE of Byron. | Comment | |||
| CAS-BOT-BC116456 | Delphinium patens subsp. patens | J. T. Howell | 1933-5-14 | 11279 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC132506 | Calochortus pulchellus | John Thomas Howell | 1940-4-21 | 15397 | Contra Costa | Pine Canyon, Mt. Diablo | Comment | |||
| CAS-BOT-BC132534 | Calochortus umbellatus | John Thomas Howell | 1933-5-14 | 11261 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC137970 | Alopecurus saccatus | John Thomas Howell | 1953-4-26 | 28936 | Contra Costa | Between Byron and Byron Hot Springs. | Comment | |||
| CAS-BOT-BC143647 | Heteromeles arbutifolia | John Thomas Howell | 1925-10-11 | 1494 | Contra Costa | Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC147410 | Rosa californica | John Thomas Howell; Gordon H. True | 1972-6-29 | 48930 | Contra Costa | Byron Hot Springs southeast of Byron | Comment | |||
| CAS-BOT-BC148107 | Rosa gymnocarpa | John Thomas Howell | 1925-9-27 | 1485 | Contra Costa | San Leandro Canyon, Oakland Hills | Comment | |||
| CAS-BOT-BC154333 | Phacelia phacelioides | John Thomas Howell | 1978-5-4 | 52870 | Contra Costa | Burned area in chaparral near summit, Mt. Diablo | 1066 | Comment | ||
| CAS-BOT-BC157455 | Solanum umbelliferum | J. T. Howell | 1933-5-14 | 11291 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC163672 | Clarkia purpurea subsp. quadrivulnera | John Thomas Howell | 1931-5-12 | 6483 | Contra Costa | Mt. Diablo | Comment | |||
| CAS-BOT-BC16379 | Barbarea orthoceras | John Thomas Howell | 1976-5-20 | s.n. | Contra Costa | Mount Diablo. Below Juniper Camp. | Comment | |||
| CAS-BOT-BC166166 | Epilobium canum subsp. canum | John Thomas Howell | 1925-11-1 | 1536 | Contra Costa | Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC168924 | Ribes malvaceum | John Thomas Howell | 1923-11-12 | 243 | Contra Costa | Mt. Diablo | Comment | |||
| CAS-BOT-BC168925 | Ribes malvaceum | John Thomas Howell | 1926-3-7 | 1667 | Contra Costa | Mt. Diablo | Comment | |||
| CAS-BOT-BC169516 | Corylus cornuta subsp. californica | John Thomas Howell | 1925-9-19 | 1456 | Contra Costa | Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC172934 | Toxicodendron diversilobum | John Thomas Howell | 1933-5-14 | 11289 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC17454 | Athysanus pusillus | John Thomas Howell | 1926-3-7 | 1677 | Contra Costa | Mount Diablo. | Comment | |||
| CAS-BOT-BC17456 | Athysanus pusillus | John Thomas Howell | 1931-3-10 | 5754 | Contra Costa | East side of Mount Diablo 7 miles from Clayton on Livermore Road. | Comment | |||
| CAS-BOT-BC17457 | Athysanus pusillus | John Thomas Howell | 1931-3-10 | 5754 | Contra Costa | East side of Mount Diablo 7 miles from Clayton on Livermore Road. | Comment | |||
| CAS-BOT-BC183936 | Vulpia microstachys var. microstachys | John Thomas Howell | 1942-5-24 | 16963 | Contra Costa | Near Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC19203 | Carex barbarae | John Thomas Howell | 1933-5-14 | 11236 | Contra Costa | St. Mary's College. | Comment | |||
| CAS-BOT-BC192679 | Deschampsia danthonioides | John Thomas Howell | 1953-4-26 | 28937 | Contra Costa | Between Byron and Byron Hot Springs | Comment | |||
| CAS-BOT-BC197108 | Echinochloa crus-galli | John Thomas Howell; Gordon H. True | 1972-6-29 | 48942 | Contra Costa | Along Byron Hot Springs Road where water has stood, southeast of Byron | Comment | |||
| CAS-BOT-BC199244 | Vaccinium ovatum | John Thomas Howell | 1925-9-12 | 1435 | Contra Costa | Oakland Hills at head of San Leandro Canyon | Comment | |||
| CAS-BOT-BC200623 | Garrya elliptica | John Thomas Howell | 1926-1-16 | 1625 | Contra Costa | Head of San Leandro Canyon, Oakland Hills | Comment | |||
| CAS-BOT-BC200634 | Garrya elliptica | John Thomas Howell | 1925-9-12 | 1437 | Contra Costa | Oakland Hills at head of San Leandro Canyon | Comment | |||
| CAS-BOT-BC204098 | Malacothamnus hallii | John Thomas Howell; T. H. Kearney | 1950-7-5 | 26634 | Contra Costa | Mt. Diablo | 259 | Comment | ||
| CAS-BOT-BC206018 | Ribes menziesii | John Thomas Howell | 1942-4-26 | 16951 | Contra Costa | Oakland Hills near Redwood Peak | Comment | |||
| CAS-BOT-BC206331 | Malacothamnus fremontii | John Thomas Howell; T. H. Kearney | 1950-7-5 | 26635 | Contra Costa | Nortonville. | Comment | |||
| CAS-BOT-BC206332 | Malacothamnus fremontii | John Thomas Howell; T. H. Kearney | 1950-7-5 | 26635 | Contra Costa | Hills above Nortonville. | Comment | |||
| CAS-BOT-BC206333 | Malacothamnus fremontii | John Thomas Howell; T. H. Kearney | 1950-7-5 | 26635 | Contra Costa | Nortonville. | Comment | |||
| CAS-BOT-BC206334 | Malacothamnus fremontii | John Thomas Howell; T. H. Kearney | 1950-7-5 | 26635 | Contra Costa | Nortonville. | Comment | |||
| CAS-BOT-BC20852 | Carex globosa | John Thomas Howell | 1953-3-15 | 28923 | Contra Costa | Rock City, Mt. Diablo. | Comment | |||
| CAS-BOT-BC208656 | Distichlis spicata | John Thomas Howell; Gordon H. True | 1972-6-29 | 48925 | Contra Costa | Byron Hot Springs Road southeast of Byron | Comment | |||
| CAS-BOT-BC209362 | Ribes sanguineum var. glutinosum | John Thomas Howell | 1925-9-12 | 1438 | Contra Costa | San Leandro Canyon, Oakland Hills | Comment | |||
| CAS-BOT-BC221679 | Monardella douglasii | John Thomas Howell | 1942-7-19 | 17049 | Contra Costa | NE. of Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC224751 | Calystegia malacophylla subsp. pedicellata | John Thomas Howell | 1942-5-24 | 16964 | Contra Costa | Near Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC22970 | Agoseris heterophylla | John Thomas Howell | 1933-5-14 | 11260 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC22971 | Agoseris heterophylla | John Thomas Howell | 1933-5-14 | 11260 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC231714 | Solanum umbelliferum | John Thomas Howell | 1926-3-7 | 1666 | Contra Costa | Mt. Diablo | Comment | |||
| CAS-BOT-BC233290 | Salvia mellifera | John Thomas Howell | 1923-11-12 | 247 | Contra Costa | Mt. Diablo | Comment | |||
| CAS-BOT-BC23596 | Arctostaphylos crustacea | John Thomas Howell | 1925-9-19 | 1446 | Contra Costa | Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC240009 | Scribneria bolanderi | John Thomas Howell | 1953-3-15 | 28924 | Contra Costa | Rock City, Mt. Diablo | Comment | |||
| CAS-BOT-BC240417 | Lonicera hispidula | John Thomas Howell | 1925-10-11 | 1489 | Contra Costa | Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC24119 | Arctostaphylos auriculata | John Thomas Howell | 1931-5-12 | 6477 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC243541 | Setaria parviflora | John Thomas Howell; Gordon H. True | 1972-6-29 | 48933 | Contra Costa | Along ditches on Byron Hot Springs Road southeast of Byron | Comment | |||
| CAS-BOT-BC24660 | Arctostaphylos glauca | John Thomas Howell | 1926-3-7 | 1674 | Contra Costa | Mt. Diablo. | Comment | |||
| CAS-BOT-BC246644 | Poa howellii | John Thomas Howell | 1933-5-14 | 11256 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC250683 | Phalaris paradoxa | John Thomas Howell | 1933-5-14 | 11235 | Contra Costa | St. Mary's College | Comment | |||
| CAS-BOT-BC259723 | Paspalum distichum | John Thomas Howell; Gordon H. True | 1972-6-29 | 48941 | Contra Costa | Along Byron Hot Springs Road, SE of Byron | Comment | |||
| CAS-BOT-BC262506 | Melica torreyana | John Thomas Howell | 1933-5-14 | 11257 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC265962 | Phalaris minor | John Thomas Howell | 1933-5-14 | 11234 | Contra Costa | St. Mary's College | Comment | |||
| CAS-BOT-BC267440 | Eriogonum truncatum | John Thomas Howell | 1934-4-8 | 11816 | Contra Costa | 10 miles from Clayton on Marsh Creek road | Comment | |||
| CAS-BOT-BC267441 | Eriogonum truncatum | John Thomas Howell | 1934-4-8 | 11816 | Contra Costa | 10 miles from Clayton on Marsh Creek Road | Comment | |||
| CAS-BOT-BC267442 | Eriogonum truncatum | John Thomas Howell | 1934-4-8 | 11816 | Contra Costa | 10 miles from Clayton on Marsh Creek Road | Comment | |||
| CAS-BOT-BC267874 | Eriogonum umbellatum var. bahiiforme | John Thomas Howell | 1942-5-24 | 16967 | Contra Costa | Eagle Peak, Mount Diablo | Comment | |||
| CAS-BOT-BC26795 | Cordylanthus nidularius | John Thomas Howell | 1942-7-19 | 17044 | Contra Costa | NE of Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC279198 | Centromadia pungens subsp. pungens | John Thomas Howell; Gordon H. True | 1972-6-29 | 48920 | Contra Costa | On Byron Hot Springs Road southeast of Byron | Comment | |||
| CAS-BOT-BC279205 | Centromadia pungens subsp. pungens | John Thomas Howell | 1930-9-28 | 5489 | Contra Costa | 2 miles from Concord on road to Walnut Creek | Comment | |||
| CAS-BOT-BC281257 | Hordeum brachyantherum subsp. brachyantherum | John Thomas Howell | 1933-5-14 | 11229 | Contra Costa | St. Mary's College | Comment | |||
| CAS-BOT-BC287535 | Ericameria linearifolia | John Thomas Howell | 1926-3-7 | 1673 | Contra Costa | Mt Diablo | Comment | |||
| CAS-BOT-BC288540 | Centromadia fitchii | John Thomas Howell | 1930-9-28 | 5497 | Contra Costa | 6.3 miles from Byron on the Marsh Creek Rd | Comment | |||
| CAS-BOT-BC295718 | Erigeron petrophilus var. petrophilus | John Thomas Howell | 1923-11-12 | 249 | Contra Costa | Mt. Diablo | Comment | |||
| CAS-BOT-BC300926 | Eriophyllum jepsonii | John Thomas Howell | 1950-7-5 | 26636 | Contra Costa | Above Nortonville | Comment | |||
| CAS-BOT-BC300968 | Eriophyllum lanatum var. achilleoides | John Thomas Howell | 1923-11-12 | 244 | Contra Costa | Mt. Diablo | Comment | |||
| CAS-BOT-BC30109 | Chrysolepis chrysophylla var. minor | John Thomas Howell | 1925-9-19 | 1442 | Contra Costa | Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC305320 | Helianthella castanea | John Thomas Howell | 1940-4-21 | 15398 | Contra Costa | Pine Canyon, Mt. Diablo | Comment | |||
| CAS-BOT-BC305325 | Helianthella castanea | John Thomas Howell | 1933-5-14 | 11282 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC305326 | Helianthella castanea | John Thomas Howell | 1931-5-12 | 6475 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC305327 | Helianthella castanea | John Thomas Howell | 1931-5-12 | 6475 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC305328 | Helianthella castanea | John Thomas Howell | 1931-5-12 | 6475 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC310192 | Hesperevax sparsiflora var. sparsiflora | John Thomas Howell | 1933-5-14 | 11259 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC314864 | Hemizonia congesta subsp. luzulifolia | John Thomas Howell | 1930-9-28 | 5488 | Contra Costa | 2 miles from Concord on road to Walnut Creek | Comment | |||
| CAS-BOT-BC320261 | Holocarpha obconica | John Thomas Howell | 1930-9-28 | 5500 | Contra Costa | 6.3 miles from Byron on the Marsh Creek Road | Comment | |||
| CAS-BOT-BC327246 | Layia hieracioides | John Thomas Howell | 1940-4-21 | 15405 | Contra Costa | Pine Canyon, Mt. Diablo | Comment | |||
| CAS-BOT-BC32964 | Cordylanthus nidularius | John Thomas Howell | 1942-7-19 | 17044 | Contra Costa | NE of Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC32965 | Cordylanthus nidularius | John Thomas Howell | 1942-7-19 | 17044 | Contra Costa | NE of Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC331614 | Acer macrophyllum | John Thomas Howell | 1926-3-7 | 1661 | Contra Costa | Mt. Diablo near toll gate | Comment | |||
| CAS-BOT-BC342120 | Logfia filaginoides | John Thomas Howell | 1940-4-21 | 15406 | Contra Costa | Pine Canyon, Mt. Diablo | Comment | |||
| CAS-BOT-BC342982 | Madia gracilis | John Thomas Howell | 1933-5-14 | 11266 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC352771 | Lasthenia glabrata subsp. glabrata | John Thomas Howell | 1933-5-14 | 11240 | Contra Costa | St. Mary's College | Comment | |||
| CAS-BOT-BC361879 | Psilocarphus tenellus | John Thomas Howell | 1933-5-14 | 11230 | Contra Costa | St. Mary's College | Comment | |||
| CAS-BOT-BC364902 | Solidago velutina subsp. californica | John Thomas Howell | 1925-10-20 | 1525 | Contra Costa | Moraga Ridge | Comment | |||
| CAS-BOT-BC37392 | Cardamine californica | John Thomas Howell | 1931-3-10 | 5757 | Contra Costa | East side of Mount Diablo 7 miles from Clayton. | Comment | |||
| CAS-BOT-BC37393 | Cardamine californica | John Thomas Howell | 1931-3-10 | 5757 | Contra Costa | East side of Mount Diablo 7 miles from Clayton on Livermore road. | Comment | |||
| CAS-BOT-BC37394 | Cardamine californica | John Thomas Howell | 1933-5-14 | 11255 | Contra Costa | Hills east of Saint Mary's College. | Comment | |||
| CAS-BOT-BC375205 | Stephanomeria elata | John Thomas Howell | 1925-11-1 | 1544 | Contra Costa | Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC382869 | Wyethia angustifolia | John Thomas Howell | 1933-5-14 | 11286 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC383367 | Wyethia helenioides | John Thomas Howell | 1933-5-14 | 11287 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC383368 | Wyethia helenioides | John Thomas Howell | 1933-5-14 | 11287 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC383369 | Wyethia helenioides | John Thomas Howell | 1933-5-14 | 11288 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC383370 | Wyethia helenioides | John Thomas Howell | 1933-5-14 | 11287 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC384137 | Forestiera pubescens subsp. parvifolia | John Thomas Howell | 1933-3-29 | 10905 | Contra Costa | Canyon below Nortonville | Comment | |||
| CAS-BOT-BC38881 | Arctostaphylos manzanita subsp. laevigata | J. T. Howell | 1926-3-7 | 1665 | Contra Costa | Mt. Diablo | Comment | |||
| CAS-BOT-BC390742 | Spergularia marina | John Thomas Howell; Gordon H. True | 1972-6-29 | 48914 | Contra Costa | On Byron Hot Springs Road southeast of Byron | Comment | |||
| CAS-BOT-BC392088 | Aquilegia formosa | John Thomas Howell | 1933-5-14 | 11253 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC422910 | Stylomecon heterophylla | John Thomas Howell | 1933-5-14 | 11269 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC428218 | Dudleya cymosa subsp. paniculata | John Thomas Howell | 1942-5-24 | 16967 A | Contra Costa | Eagle Peak, Mt. Diablo | Comment | |||
| CAS-BOT-BC430619 | Lithophragma affine | John Thomas Howell | 1933-5-14 | 11280 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC435650 | Lithophragma heterophyllum | John Thomas Howell | 1926-3-7 | 1660 | Contra Costa | Mt. Diablo near toll gate | Comment | |||
| CAS-BOT-BC436386 | Calystegia subacaulis | John Thomas Howell | 1933-5-14 | 11270 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC436989 | Acaena pinnatifida var. californica | John Thomas Howell | 1933-5-14 | 11285 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC438374 | Calandrinia ciliata | John Thomas Howell | 1940-4-21 | 15407 | Contra Costa | Pine Canyon, Mt. Diablo | Comment | |||
| CAS-BOT-BC439167 | Claytonia exigua subsp. exigua | John Thomas Howell | 1926-3-7 | 1676 | Contra Costa | Mt. Diablo | Comment | |||
| CAS-BOT-BC439440 | Claytonia parviflora subsp. parviflora | John Thomas Howell | 1933-5-14 | 11252 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC440075 | Claytonia perfoliata subsp. perfoliata | John Thomas Howell | 1931-3-10 | 5755 | Contra Costa | East side of Mt. Diablo 7 miles from Clayton on Livermore road | Comment | |||
| CAS-BOT-BC440076 | Claytonia perfoliata subsp. perfoliata | John Thomas Howell | 1933-5-14 | 11273 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC440077 | Claytonia perfoliata subsp. perfoliata | John Thomas Howell | 1931-3-10 | 5755 | Contra Costa | East side of Mt. Diablo 7 miles from Clayton on Livermore road | Comment | |||
| CAS-BOT-BC445038 | Montia linearis | John Thomas Howell | 1933-5-14 | 11226 | Contra Costa | St. Mary's College | Comment | |||
| CAS-BOT-BC45655 | Quercus agrifolia | John Thomas Howell | 1950-7-5 | 26638 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC45656 | Quercus agrifolia | John Thomas Howell | 1950-7-5 | 26638 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC45657 | Quercus agrifolia | John Thomas Howell | 1926-12-27 | 2274 | Contra Costa | Near Oakley | Comment | |||
| CAS-BOT-BC48832 | Ceanothus cuneatus | John Thomas Howell | 1926-3-7 | 1664 | Contra Costa | Mt. Diablo on old wagon road | Comment | |||
| CAS-BOT-BC62921 | Frangula californica subsp. tomentella | John Thomas Howell | 1930-9-28 | 5490 | Contra Costa | Marsh Creek Rd., e. of Clayton. | Comment | |||
| CAS-BOT-BC78295 | Pinus attenuata | John Thomas Howell | 1925-9-19 | 1443 | Contra Costa | Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC80264 | Sequoia sempervirens | John Thomas Howell | 1927-2-6 | 2279 | Contra Costa | San Leandro [Canon] Canyon at Pinehurst | 152 | Comment | ||
| CAS-BOT-BC80265 | Sequoia sempervirens | John Thomas Howell | 1925-10-11 | 1500 | Contra Costa | Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC80924 | Juniperus californica | John Thomas Howell | 1923-11-13 | 239 | Contra Costa | Mt. Diablo | 914 | Comment | ||
| CAS-BOT-BC86648 | Quercus douglasii | John Thomas Howell | 1926-3-7 | 1658 | Contra Costa | Mt. Diablo near toll gate | Comment | |||
| CAS-BOT-BC87097 | Streptanthus glandulosus subsp. glandulosus | John Thomas Howell | 1942-5-24 | 16965 | Contra Costa | Near Deer Flat, Mount Diablo. | Comment | |||
| CAS-BOT-BC87098 | Streptanthus glandulosus subsp. glandulosus | John Thomas Howell | 1942-7-19 | 17048 | Contra Costa | Northeast of Deer Flat, Mount Diablo. | Comment | |||
| CAS-BOT-BC87332 | Streptanthus hispidus | John Thomas Howell | 1941-4-6 | 16178 | Contra Costa | Ridge west of Deer Flat, Mount Diablo. | Comment | |||
| CAS-BOT-BC88251 | Thysanocarpus curvipes | John Thomas Howell | 1933-5-14 | 11271 | Contra Costa | Hills east of Saint Mary's College. | Comment | |||
| CAS-BOT-BC88252 | Thysanocarpus curvipes | John Thomas Howell | 1933-5-14 | 11274 | Contra Costa | Hills east of Saint Mary's College. | Comment | |||
| CAS-BOT-BC89765 | Lepidium latipes | John Thomas Howell | 1933-3-29 | 10907 | Contra Costa | Nortonville Hills. | Comment | |||
| CAS-BOT-BC91604 | Platystemon californicus | John Thomas Howell | 1933-5-14 | 11278 | Contra Costa | Hills east of Saint Mary's College. | Comment | |||
| CAS-BOT-BC91605 | Platystemon californicus | John Thomas Howell | 1933-5-14 | 11277 | Contra Costa | Hills east of Saint Mary's College. | Comment | |||
| CAS-BOT-BC92921 | Ribes californicum var. californicum | John Thomas Howell | 1926-3-7 | 1669 | Contra Costa | Mount Diablo. | Comment | |||
| CAS-BOT-BC95309 | Bowlesia incana | John Thomas Howell | 1933-3-29 | 10901 | Contra Costa | Nortonville hills | Comment | |||
| CAS-BOT-BC97700 | Symphyotrichum chilense | John Thomas Howell | 1925-11-1 | 1534 | Contra Costa | Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC98614 | Baccharis pilularis | John Thomas Howell; Gordon H. True | 1972-6-29 | 48926 | Contra Costa | Near Byron Hot Springs (site) | Comment | |||
| JEPS21710 | Plantago major | John Thomas Howell | 1955-8-24 | 30898 | Contra Costa | near Diablo Country Club | Comment | |||
| JEPS21718 | Cordylanthus pilosus subsp. pilosus | John Thomas Howell | 1955-8-24 | 30902 | Contra Costa | near Diablo Country Club; Mt. Diablo, S base of | Comment | |||
| JEPS35429 | Helenium puberulum | John Thomas Howell | 1926-1-16 | 1626 | Contra Costa | San Leandro Canyon Oakland Hills | Comment | |||
| JEPS37916 | Plantago elongata | J. T. Howell | 1933-3-29 | 10897 | Contra Costa | Nortonville | Comment | |||
| JEPS3931 | Lactuca virosa | John Thomas Howell | 1943-8-22 | 19310 | Contra Costa | near head of San Leandro Creek Canyon | 243 | Comment | ||
| JEPS54721 | Cordylanthus nidularius | J. T. Howell | 1942-7-19 | 17044 | Contra Costa | NE of Deer Flat; Mt. Diablo; NE of Deer Flat, Mt. Diablo, Contra Costa Co. | 609 | Comment | ||
| JEPS74307 | Frankenia salina | John Thomas Howell and Gordon H. True | 1972-6-29 | 48919 | Contra Costa | Byron Hot Springs Road se Byron | Comment | |||
| JEPS88687 | Hemizonia congesta subsp. luzulifolia | John Thomas Howell | 1955-8-24 | 30900 | Contra Costa | field border near Diablo Country Club; s base of Mt. Diablo | Comment | |||
| JEPS88689 | Centromadia fitchii | John Thomas Howell | 30904 | Contra Costa | near Turtle Rock; Mt. Diablo | 259 | Comment | |||
| LA203706 | Hemizonia congesta subsp. luzulifolia | John Thomas Howell; | 1930-9-28 | 5488 | Contra Costa | 2 mi. from Concord on road to Walnut Creek | Comment | |||
| LA205246 | Trifolium gracilentum | John Thomas Howell; | 1933-5-14 | 11264 | Contra Costa | E of St. Mary's College | Comment | |||
| LA206696 | Navarretia mellita | John Thomas Howell; | 1938-6-30 | 13938 | Contra Costa | head of Siesta Valley | Comment | |||
| LA207022 | Eriogonum truncatum | John Thomas Howell; | 1934-4-8 | 11816 | Contra Costa | 10 mi. from Clayton on Marsh Creek Road | Comment | |||
| NY68295 | Cordylanthus nidularius | J. T. Howell | 1942-7-19 | 17044 | Contra Costa | Near of Deer Flat, Mt. Diablo. | Comment Read comments Jul 18 2011 |
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| NY68296 | Cordylanthus nidularius | J. T. Howell | 1942-7-19 | 17044 | Contra Costa | Near of Deer Flat, Mt. Diablo. | Comment Read comments Jul 18 2011 |
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| NY68297 | Cordylanthus nidularius | J. T. Howell | 1942-7-19 | 17044 | Contra Costa | Near of Deer Flat, Mt. Diablo. | Comment Read comments Jul 18 2011 |
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| POM181148 | Clarkia affinis | J. T. Howell | 1931-5-12 | 6483 | Contra Costa | Mt. Diablo. | Comment | |||
| POM181150 | Ribes californicum | J. T. Howell | 1931-2-21 | 5730 | Contra Costa | Mt. Diablo. | Comment | |||
| POM181154 | Clarkia unguiculata | J. T. Howell | 1931-5-12 | 6481 | Contra Costa | Mt. Diablo. | Comment | |||
| POM193975 | Arctostaphylos manzanita subsp. manzanita | J. T. Howell | 1926-3-7 | 1665 | Contra Costa | Mt. Diablo on old wagon road. | Comment | |||
| POM203039 | Atriplex joaquinana | J. T. Howell | 1934-4-8 | 11823 | Contra Costa | South of Antioch, Contra Costa County | Comment | |||
| POM203448 | Forestiera pubescens | J. T. Howell | 1933-3-29 | 10905 | Contra Costa | Canyon below Nortonville | Comment | |||
| POM203709 | Helianthella castanea | J. T. Howell | 1931-5-12 | 6475 | Contra Costa | Nortonville | Comment | |||
| POM248733 | Cirsium quercetorum | J. T. Howell | 1938-6-30 | 13940 | Contra Costa | Berkeley Hills on NE slope near head of Wildcat Canyon. | Comment Read comments Nov 27 2009 |
|||
| POM304529 | Hesperolinon breweri | J. T. Howell | 1942-7-19 | s.n. | Contra Costa | Northeast of Deer Flat, Mount Diablo | Comment | |||
| RSA118089 | Eragrostis curvula | J. T. Howell | 1954-9-5 | 30026 | Contra Costa | Along road, Marsh Creek Springs Park | Comment | |||
| RSA15451 | Mimulus aurantiacus var. aurantiacus | J. T. Howell | 1936-4-19 | s.n. | Contra Costa | Nortonville | Comment | |||
| RSA244714 | Frankenia salina | J. T. Howell, G. H. True | 1972-6-29 | 48919 | Contra Costa | On Byron Hot Springs Road SE of Byron. | Comment | |||
| RSA26397 | Streptanthus hispidus | J. T. Howell | 1941-4-6 | s.n. | Contra Costa | Ridge east of Deer Park, Mt. Diablo | Comment | |||
| RSA65310 | Eriogonum truncatum | J. T. Howell | 1934-4-8 | 11816 | Contra Costa | 10 miles from Clayton on Marsh Creek Road | Comment | |||
| RSA66775 | Lepidium latipes | J. T. Howell | 1933-3-29 | 10907 | Contra Costa | Nortonville | Comment | |||
| RSA72655 | Helianthella castanea | J. T. Howell | 1940-4-21 | 15398 | Contra Costa | Pine Canyon, Mount Diablo | Comment | |||
| RSA8517 | Calochortus umbellatus | J. T. Howell | 1933-5-14 | 11261 | Contra Costa | Hills east of St. Marys college | Comment | |||
| RSA8535 | Helianthella castanea | J. T. Howell | 1933-5-14 | 11282 | Contra Costa | Hills east of St. Mary's college | Comment | |||
| SBBG27401 | Galium murale | J. T. Howell | 1942-4-26 | 16953 | Contra Costa | Redwood Cyn, Oakland Hills | Comment | |||
| SBBG28847 | Plagiobothrys bracteatus | J. T. Howell | 1933-5-14 | 11232 | Contra Costa | St Mary's College | Comment | |||
| SBBG29918 | Hesperolinon breweri | J. T. Howell | 1942-7-19 | Contra Costa | NE of Deer Flat, Mt Diablo | Comment | ||||
| SBBG29926 | Nemophila heterophylla | J. T. Howell | 1933-5-14 | 12218 | Contra Costa | E of St. Mary's College | Comment | |||
| SBBG29985 | Trifolium ciliolatum | J. T. Howell | 1933-5-14 | 11245 | Contra Costa | hills E of St Mary's College | Comment | |||
| SBBG29986 | Trifolium bifidum var. decipiens | J. T. Howell | 1933-5-14 | 11264 | Contra Costa | hills E of St Mary's College | Comment | |||
| SBBG39713 | Amsinckia intermedia | J. T. Howell | 1933-5-14 | 11225 | Contra Costa | St Mary's College | Comment | |||
| SD71393 | Amsinckia lycopsoides | John Thomas Howell | 1933-5-14 | 11225 | Contra Costa | St. Mary's College | Comment | |||
| SD71397 | Amsinckia menziesii | John Thomas Howell | 1933-5-14 | 11224 A | Contra Costa | St. Mary's College | Comment | |||
| SEINET3163766 | Navarretia mellita | J. T. Howell | 1938-6-30 | 13938 | Contra Costa | head of Siesta Valley | Comment | |||
| UC1026379 | Downingia insignis | John Thomas Howell | 1953-4-26 | 28935 | Contra Costa | between Byron and Byron Hot Springs | Comment | |||
| UC1026409 | Carex globosa | John Thomas Howell | 1953-3-15 | 28923 | Contra Costa | Rock City Mt. Diablo | Comment | |||
| UC1042561 | Quercus agrifolia | John Thomas Howell | 1950-7-5 | 26638 | Contra Costa | Nortonville | Comment | |||
| UC1177504 | Polypodium calirhiza | John Thomas Howell | 1940-2-11 | Contra Costa | near Rock City; Mt. Diablo | Comment | ||||
| UC1598596 | Holocarpha heermannii | John Thomas Howell | 1955-8-24 | 30901 | Contra Costa | near Diablo Country Club (s base of Mt. Diablo); Mt. Diablo | Comment | |||
| UC421666 | Epilobium campestre | John Thomas Howell | 1929-7-20 | 4331 | Contra Costa | Pittsburg | Comment | |||
| UC421693 | Centromadia fitchii | John Thomas Howell | 1929-9-21 | 4388 | Contra Costa | 1 mi se Clayton | Comment | |||
| UC473441 | Centromadia pungens subsp. pungens | John Thomas Howell | 1930-9-28 | 5489 | Contra Costa | 2 mi from Concord (on road to Walnut Creek) | Comment | |||
| UC473456 | Holocarpha heermannii | John Thomas Howell | 1930-9-28 | 5499 | Contra Costa | 6.3 mi from Byron (on the Marsh Creek Rd.) | Comment | |||
| UC473563 | Hemizonia congesta subsp. luzulifolia | John Thomas Howell | 1930-9-28 | 5488 | Contra Costa | 2 mi from Concord (on road to Walnut Creek) | Comment | |||
| UC485559 | Ancistrocarphus filagineus | Thomas Howell | 1883-5-1 | Contra Costa | Antioch | Comment | ||||
| UC517456 | Carduus pycnocephalus subsp. pycnocephalus | J. Thomas Howell | 1933-5-14 | 11246 | Contra Costa | hills e of St. Mary's College | Comment | |||
| UC517457 | Madia gracilis | John Thomas Howell | 1933-5-14 | 11266 | Contra Costa | hills e St. Mary's College | Comment | |||
| UC517459 | Plagiobothrys bracteatus | John Thomas Howell | 1933-5-14 | 11232 | Contra Costa | St. Mary's College | Comment | |||
| UC517466 | Agoseris heterophylla var. heterophylla | J. Thomas Howell | 1933-5-14 | 11260 | Contra Costa | hills east of St. Mary's College | Comment | |||
| UC517484 | Nemophila heterophylla | John Thomas Howell | 1933-5-14 | 11218 | Contra Costa | hills e St. Mary's College; hills e of St. Mary's College | Comment | |||
| UC517488 | Trifolium gracilentum | John Thomas Howell | 1933-5-14 | 11249 | Contra Costa | e St. Mary's College (hills) | Comment | |||
| UC517489 | Trifolium ciliolatum | John Thomas Howell | 1933-5-14 | 11245 | Contra Costa | e St. Mary's College (hills) | Comment | |||
| UC517550 | Nemophila heterophylla | John Thomas Howell | 1926-3-7 | 1659 | Contra Costa | Mt. Diablo near toll gate Mt. Diablo | Comment | |||
| UC517947 | Dodecatheon hendersonii | John Thomas Howell | 1931-3-10 | 5756 | Contra Costa | on Livermore Road 7 mi from Clayton; e side Mt. Diablo, 7 mi from Clayton | Comment | |||
| UC517966 | Claytonia perfoliata subsp. perfoliata | John Thomas Howell | 1931-3-10 | 5755 | Contra Costa | 7 mi from Clayton (on Livermore road, e side of Mt. Diablo); Mt. Diablo | Comment | |||
| UC517968 | Holocarpha obconica | John Thomas Howell | 1930-9-28 | 5501 | Contra Costa | dry hills along the Marsh Creek Road 5.4 mi from Byron | Comment | |||
| UC517970 | Athysanus pusillus | John Thomas Howell | 1931-3-10 | 5754 | Contra Costa | 7 mi from Clayton (on Livermore Road, e side of Mount Diablo); Mount Diablo | Comment | |||
| UC517996 | Cardamine californica | John Thomas Howell | 1931-3-10 | 5757 | Contra Costa | on Livermore Road 7 mi from Clayton (e side Mt. Diablo); e side Mt. Diablo | Comment | |||
| UC526210 | Eriogonum truncatum | John Thomas Howell | 1934-4-8 | 11816 | Contra Costa | 10 mi on Marsh Creek Road Clayton | Comment | |||
| UC666653 | Sanicula saxatilis | John Thomas Howell | 1942-5-24 | 16969 | Contra Costa | Mount Diablo, Eagle Peak Mount Diablo; , Eagle Peak | Comment | |||
| UC691741 | Cordylanthus nidularius | J. T. Howell | 1942-7-19 | 17044 | Contra Costa | NE (?) of Deer Flat, Mt. Diablo, Contra Costa Co. | Comment | |||
| UC691880 | Sanicula saxatilis | J. T. Howell | 1942-5-24 | 16969 | Contra Costa | Mount Diablo, Eagle Point Mount Diablo; , Eagle Point | Comment | |||
| UC692353 | Parvisedum pentandrum | J. T. Howell | 16970 | Contra Costa | ne of Deer Flat (Mount Diablo); Mount Diablo | 609 | Comment | |||
| UC703025 | Navarretia mellita | John Thomas Howell | 1942-7-19 | 17045 | Contra Costa | ne of Deer Flat; Mt. Diablo | Comment | |||
| UC703118 | Galium murale | John Thomas Howell | 1942-4-26 | 16953 | Contra Costa | Redwood Canyon Oakland Hills | Comment | |||
| UC710613 | Lactuca virosa | John Thomas Howell | 1943-8-22 | 19310 | Contra Costa | San Leandro Creek Canyon | 243 | Comment | ||
| UC820506 | Phalaris minor | John Thomas Howell | 1933-5-14 | 11234 | Contra Costa | St. Mary's College | Comment | |||
| UC856837 | Navarretia mellita | John Thomas Howell | 1938-6-30 | 13938 | Contra Costa | Head of Siesta Valley | Comment | |||
| UC961415 | Malacothamnus fremontii | John Thomas Howell and T. H. Kearney | 1950-7-5 | 26635 | Contra Costa | Nortonville | Comment | |||
| UCD113415 | Rosa californica | John Thomas Howell; Gordon H. True | 1972-6-29 | 48930 | Contra Costa | Byron Hot Springs Road, SE of Byron. | Comment | |||
| UCD132123 | Eriophyllum jepsonii | John Thomas Howell | 1950-7-5 | 26636 | Contra Costa | above Nortonville. | Comment | |||
| UCD136704 | Eryngium spinosepalum | John Thomas Howell; Gordon H. True | 1972-6-29 | 48927 | Contra Costa | Byron Hot Springs Road, SE of Byron. | Comment | |||
| UCD45129 | Quercus agrifolia | John Thomas Howell | 1950-7-5 | 26638 | Contra Costa | Small tree, Nortonville, Contra Costa Co. | Comment | |||
| UCD64182 | Distichlis spicata | John Thomas Howell; Gordon H. True | 1972-6-29 | 48925 | Contra Costa | On Byron Hot Springs Road southeast of Byron. | Comment | |||
| UCD92599 | Setaria parviflora | John Thomas Howell; Gordon H. True | 1972-6-29 | 48933 | Contra Costa | Byron Hot Springs. Road southeast of Byron. | Comment | |||
| UCD99590 | Frankenia salina | John Thomas Howell; Gordon H. True | 1972-6-29 | 48919 | Contra Costa | on Byron Hot Springs Road southeast of Byron. | Comment | |||
| UCR139461 | Eriogonum truncatum | J. T. Howell | 1934-4-8 | 11816 | Contra Costa | San Francisco Bay Region, [Black Hills] 10 mi from Clayton [SE] on Marsh Creek Road | 366 | Comment | ||
| UCR168521 | Hesperolinon micranthum | J. T. Howell | 1931-5-12 | 6472 | Contra Costa | Central Western; San Francisco Bay area, Nortonville | 488 | Comment | ||
| UCR66430 | Lactuca virosa | J. T. Howell | 1943-8-22 | 19310 | Contra Costa | San Francisco Bay Region/Coast Range, near head of San Leandro Creek Canyon | 244 | Comment Read comments Jul 7 2009 |
||
| CAS-BOT-BC10011 | Delphinium hesperium subsp. pallescens | John Thomas Howell | 1934-4-8 | 11824 | Contra Costa | South of Antioch | Comment | |||
| CAS-BOT-BC10013 | Delphinium hesperium subsp. pallescens | John Thomas Howell | 1931-5-12 | 6482 | Contra Costa | North Side of Mt. Diablo | Comment | |||
| CAS-BOT-BC10015 | Delphinium hesperium subsp. pallescens | John Thomas Howell | 1931-5-12 | 6482 | Contra Costa | North side of Mt. Diablo | Comment | |||
| CAS-BOT-BC111377 | Schoenoplectus acutus var. occidentalis | John Thomas Howell; Gordon H. True | 1972-6-29 | 48937 | Contra Costa | Wet soil or shallow water along ditches on Bryon Hot Springs Road SE of Byron. | Comment | |||
| CAS-BOT-BC113834 | Cyperus niger | John Thomas Howell | 1950-7-5 | 26633 | Contra Costa | Spring along North Road, Mt. Diablo. | Comment | |||
| CAS-BOT-BC116458 | Delphinium patens subsp. patens | J. T. Howell | 1931-3-10 | 5758 | Contra Costa | 7 miles east of Clayton, Mt. Diablo region | Comment | |||
| CAS-BOT-BC116461 | Delphinium patens subsp. patens | J. T. Howell | 1931-3-10 | 5758 | Contra Costa | 7 miles east of Clayton, Mt. Diablo region | Comment | |||
| CAS-BOT-BC123704 | Grindelia camporum var. parviflora | John Thomas Howell | 1930-9-28 | 5496 | Contra Costa | Liberty School on Marsh Creek Road | Comment | |||
| CAS-BOT-BC137271 | Piperia elegans | John Thomas Howell | 1925-9-12 | 1436 | Contra Costa | Field redacted by CAS, contact the data manager for more information | Comment | |||
| CAS-BOT-BC137272 | Piperia elegans | John Thomas Howell | 1942-8-23 | 17862 | Contra Costa | Field redacted by CAS, contact the data manager for more information | Comment | |||
| CAS-BOT-BC146024 | Avena barbata | John Thomas Howell | 1983-5-12 | 54745 | Contra Costa | Mount Diablo. Juniper Camp. | 914 | Comment | ||
| CAS-BOT-BC148631 | Ptelea crenulata | John Thomas Howell | 1934-4-8 | 11811 | Contra Costa | 7 miles from Clayton on road to Livermore | Comment | |||
| CAS-BOT-BC148632 | Ptelea crenulata | John Thomas Howell | 1929-9-21 | 4390 | Contra Costa | Marsh Creek Road 7 miles se. of Clayton | Comment | |||
| CAS-BOT-BC151950 | Diplacus douglasii | John Thomas Howell | 1941-4-6 | 16177 | Contra Costa | Near Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC15962 | Boechera breweri subsp. breweri | John Thomas Howell | 1926-3-7 | 1671 | Contra Costa | Mount Diablo. | Comment | |||
| CAS-BOT-BC162565 | Clarkia affinis | John Thomas Howell | 1931-5-12 | 6483 | Contra Costa | North side of Mt. Diablo | Comment | |||
| CAS-BOT-BC165453 | Clarkia unguiculata | John Thomas Howell | 1931-5-12 | 6481 | Contra Costa | North side of Mt. Diablo | Comment | |||
| CAS-BOT-BC167433 | Hesperolinon breweri | John Thomas Howell | 1942-7-19 | 17047 | Contra Costa | Serpentine ne. of Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC168540 | Atriplex coronata | John Thomas Howell | 1930-9-28 | 5503 | Contra Costa | 5.4 miles from Byron on Marsh Creek Road | Comment | |||
| CAS-BOT-BC170925 | Alnus rhombifolia | John Thomas Howell | 1925-9-19 | 1474 | Contra Costa | East side of Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC172935 | Toxicodendron diversilobum | John Thomas Howell | 1925-11-1 | 1541 | Contra Costa | Ne. side of Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC184717 | Vulpia myuros subsp. megalura | John Thomas Howell | 1933-5-14 | 11243 | Contra Costa | St. Mary's College | Comment | |||
| CAS-BOT-BC187856 | Lupinus chamissonis | John Thomas Howell | 1932-9-17 | 10757 | Contra Costa | Clay Flats, San Pablo Avenue, Richmond | Comment | |||
| CAS-BOT-BC187857 | Lupinus chamissonis | John Thomas Howell | 1926-12-27 | 2272 | Contra Costa | 1.5 miles S of Oakley | Comment | |||
| CAS-BOT-BC200635 | Garrya elliptica | John Thomas Howell | 1930-6-15 | 5304 | Contra Costa | NE. slope of Grizzley [Grizzly] Peak, Berkeley Hills | Comment | |||
| CAS-BOT-BC202275 | Pickeringia montana var. montana | John Thomas Howell | 1925-10-11 | 1506 | Contra Costa | NW. end of Moraga Ridge, Oakland Hills | Comment | |||
| CAS-BOT-BC204094 | Malacothamnus hallii | John Thomas Howell; T. H. Kearney | 1950-7-5 | 26634 | Contra Costa | On North Road, Mt. Diablo | 259 | Comment | ||
| CAS-BOT-BC204095 | Malacothamnus hallii | John Thomas Howell; T. H. Kearney | 1950-7-5 | 26634 | Contra Costa | On North Road, Mt. Diablo | 259 | Comment | ||
| CAS-BOT-BC204096 | Malacothamnus hallii | John Thomas Howell; T. H. Kearney | 1950-7-5 | 26634 | Contra Costa | On North Road, Mt. Diablo | 259 | Comment | ||
| CAS-BOT-BC204097 | Malacothamnus hallii | John Thomas Howell; T. H. Kearney | 1950-7-5 | 26634 | Contra Costa | On North Road, Mt. Diablo | 259 | Comment | ||
| CAS-BOT-BC204316 | Elymus trachycaulus subsp. trachycaulus | John Thomas Howell | 1942-7-19 | 17042 | Contra Costa | Near Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC204547 | Eragrostis curvula | John Thomas Howell | 1954-9-5 | 30026 | Contra Costa | Marsh Creek Springs Park | Comment | |||
| CAS-BOT-BC206017 | Ribes menziesii | John Thomas Howell | 1980-4-10 | 53367 | Contra Costa | Morgan Territory east of Mt. Diablo | Comment | |||
| CAS-BOT-BC210452 | Cornus sericea subsp. occidentalis | John Thomas Howell | 1925-11-7 | 1559 | Contra Costa | San Leandro Canyon near Canyon Station | Comment | |||
| CAS-BOT-BC220512 | Monardella villosa | John Thomas Howell | 1929-7-7 | 4324 | Contra Costa | On northern slope near south end of Carquinez Bridge | 45 | Comment | ||
| CAS-BOT-BC222218 | Amsinckia | John Thomas Howell | 1934-4-8 | 11812 | Contra Costa | 7 miles from Clayton on road to Livermore | Comment | |||
| CAS-BOT-BC222219 | Amsinckia | John Thomas Howell | 1934-4-8 | 11826 | Contra Costa | South of Antioch | Comment | |||
| CAS-BOT-BC222220 | Amsinckia | John Thomas Howell | 1934-4-8 | 11827 | Contra Costa | South of Antioch | Comment | |||
| CAS-BOT-BC222221 | Amsinckia | John Thomas Howell | 1934-4-8 | 11814 | Contra Costa | 7 miles from Clayton on road to Livermore | Comment | |||
| CAS-BOT-BC222222 | Amsinckia | John Thomas Howell | 1934-4-8 | 11813 | Contra Costa | 7 miles from Clayton on road to Livermore | Comment | |||
| CAS-BOT-BC222230 | Amsinckia | John Thomas Howell | 1933-3-29 | 10910 | Contra Costa | Nortonville hills | Comment | |||
| CAS-BOT-BC222231 | Amsinckia | John Thomas Howell | 1933-3-29 | 10916 | Contra Costa | Pittsburg | Comment | |||
| CAS-BOT-BC222232 | Amsinckia | John Thomas Howell | 1933-3-29 | 10908 A | Contra Costa | Nortonville hills | Comment | |||
| CAS-BOT-BC222233 | Amsinckia | John Thomas Howell | 1933-3-29 | 10908 | Contra Costa | Nortonville hills | Comment | |||
| CAS-BOT-BC222234 | Amsinckia | John Thomas Howell | 1933-3-29 | 10913 | Contra Costa | Nortonville hills | Comment | |||
| CAS-BOT-BC222235 | Amsinckia | John Thomas Howell | 1933-3-29 | 10912 | Contra Costa | Nortonville hills | Comment | |||
| CAS-BOT-BC222236 | Amsinckia | John Thomas Howell | 1933-3-29 | 10911 | Contra Costa | Nortonville hills | Comment | |||
| CAS-BOT-BC223859 | Frankenia salina | John Thomas Howell; Gordon H. True | 1972-6-29 | 48919 | Contra Costa | On Byron Hot Springs Road southeast of Byron, Contra Costa | Comment | |||
| CAS-BOT-BC233584 | Navarretia pubescens | John Thomas Howell | 1942-7-19 | 17041 | Contra Costa | Near Deer Flat, Mount Diablo | Comment | |||
| CAS-BOT-BC23559 | Arctostaphylos crustacea | John Thomas Howell | 1952-3-2 | 28297 | Contra Costa | East end of Moraga Ridge summit | Comment | |||
| CAS-BOT-BC23560 | Arctostaphylos crustacea | John Thomas Howell | 1930-6-15 | 5311 | Contra Costa | Rocky north-west slope of summit of Grizzley Peak, Berkeley Hills. | Comment | |||
| CAS-BOT-BC236611 | Spartina foliosa | John Thomas Howell | 1932-10-8 | 10793 | Contra Costa | Mouth of Rodeo Creek | Comment | |||
| CAS-BOT-BC240418 | Lonicera hispidula | John Thomas Howell | 1925-9-12 | 1433 | Contra Costa | Oakland Hills | Comment | |||
| CAS-BOT-BC250380 | Eriogonum gracile | John Thomas Howell | 1929-9-21 | 4392 | Contra Costa | Marsh Creek Road 8 miles se. of Clayton | Comment | |||
| CAS-BOT-BC250382 | Eriogonum gracile | John Thomas Howell | 1929-9-21 | 4392 | Contra Costa | Marsh Creek Road 8 miles se. of Clayton | Comment | |||
| CAS-BOT-BC250383 | Eriogonum gracile | John Thomas Howell | 1932-10-2 | 10789 | Contra Costa | Marsh Creek Road southwest of Brentwood | Comment | |||
| CAS-BOT-BC250384 | Eriogonum gracile | John Thomas Howell | 1929-7-20 | 4330 | Contra Costa | 2 miles s. of Oakley | Comment | |||
| CAS-BOT-BC250387 | Eriogonum gracile | John Thomas Howell | 1929-7-20 | 4330 | Contra Costa | 2 miles s. of Oakley | Comment | |||
| CAS-BOT-BC254883 | Poa bulbosa | John Thomas Howell | 1983-5-12 | 54747 | Contra Costa | Juniper Camp, Mount Diablo | 914 | Comment | ||
| CAS-BOT-BC259139 | Eriogonum latifolium | John Thomas Howell | 1930-7-4 | 5336 | Contra Costa | In the north Berkeley Hills | Comment | |||
| CAS-BOT-BC259646 | Paspalum dilatatum | John Thomas Howell; Gordon H. True | 1972-6-29 | 48940 | Contra Costa | Along Byron Hot Springs Road where water has stood, SE of Byron | Comment | |||
| CAS-BOT-BC259647 | Paspalum dilatatum | John Thomas Howell | 1954-9-5 | 30025 | Contra Costa | Marsh Creek Springs Park | Comment | |||
| CAS-BOT-BC262350 | Eriogonum vimineum | John Thomas Howell | 1955-8-24 | 30903 | Contra Costa | Near summit of South Peak, Mt. Diablo | 1158 | Comment | ||
| CAS-BOT-BC262352 | Eriogonum vimineum | John Thomas Howell | 1955-8-24 | 30903 | Contra Costa | Near summit of South Peak, Mt. Diablo | Comment | |||
| CAS-BOT-BC268909 | Eriogonum nudum var. auriculatum | John Thomas Howell | 1930-7-4 | 5337 | Contra Costa | In the north Berkeley Hills | Comment | |||
| CAS-BOT-BC268914 | Eriogonum nudum var. auriculatum | John Thomas Howell | 1929-9-21 | 4393 | Contra Costa | On Marsh Creek Road 8 miles se. of Clayton | Comment | |||
| CAS-BOT-BC272218 | Leymus triticoides | John Thomas Howell; Gordon H. True | 1972-6-29 | 48928 | Contra Costa | Byron Hot Springs Road southeast of Byron | Comment | |||
| CAS-BOT-BC273931 | Leptochloa fusca subsp. fascicularis | John Thomas Howell; Gordon H. True | 1972-6-29 | 48944 | Contra Costa | Along Byron Hot Springs Road where water has stood, southeast of Byron | Comment | |||
| CAS-BOT-BC277974 | Cirsium cymosum | John Thomas Howell | 1942-7-19 | 17039 | Contra Costa | Near Rock City, Mt. Diablo | Comment | |||
| CAS-BOT-BC277975 | Cirsium cymosum | John Thomas Howell | 1942-7-19 | 17039 | Contra Costa | Near Rock City, Mt. Diablo | Comment | |||
| CAS-BOT-BC277976 | Cirsium cymosum | John Thomas Howell | 1931-5-12 | 6478 | Contra Costa | North side of Mt. Diablo | Comment | |||
| CAS-BOT-BC277977 | Cirsium cymosum | John Thomas Howell | 1931-5-12 | 6479 | Contra Costa | North side of Mt. Diablo | Comment | |||
| CAS-BOT-BC279180 | Centromadia pungens subsp. pungens | John Thomas Howell | 1929-9-21 | 4395 | Contra Costa | Marsh Creek Road 3.5 miles sw. of Brentwood | Comment | |||
| CAS-BOT-BC281737 | Carduus pycnocephalus | John Thomas Howell | 1933-5-14 | 11246 | Contra Costa | Hills E of St Mary's College | Comment | |||
| CAS-BOT-BC281738 | Carduus pycnocephalus | John Thomas Howell | 1933-5-14 | 11246 | Contra Costa | Hills E of St Mary's College | Comment | |||
| CAS-BOT-BC281805 | Carduus tenuiflorus | John Thomas Howell | 1933-5-21 | 11323 | Contra Costa | San Pablo | Comment | |||
| CAS-BOT-BC288539 | Centromadia fitchii | John Thomas Howell | 1929-9-21 | 4388 | Contra Costa | 1 mile SE of Clayton | Comment | |||
| CAS-BOT-BC288541 | Centromadia fitchii | John Thomas Howell | 1955-8-24 | 30904 | Contra Costa | Mt Diablo near Turtle Rock | 259 | Comment | ||
| CAS-BOT-BC288883 | Centromadia parryi subsp. congdonii | John Thomas Howell | 1932-10-16 | 10820 | Contra Costa | Near San Ramon | Comment | |||
| CAS-BOT-BC291811 | Deinandra lobbii | John Thomas Howell | 1933-9-17 | 11663 | Contra Costa | Hills south of Rodeo | Comment | |||
| CAS-BOT-BC294020 | Deinandra kelloggii | John Thomas Howell | 1930-9-28 | 5505 | Contra Costa | 3.2 miles from Byron on Marsh Creek Road | Comment | |||
| CAS-BOT-BC294021 | Deinandra kelloggii | John Thomas Howell | 1929-7-20 | 4329 | Contra Costa | 2 miles s. of Oakley | Comment | |||
| CAS-BOT-BC299742 | Cynara cardunculus | John Thomas Howell | 1953-3-15 | 28922 | Contra Costa | Danville | Comment | |||
| CAS-BOT-BC299743 | Cynara cardunculus | John Thomas Howell | 1953-3-15 | 28922 | Contra Costa | Danville | Comment | |||
| CAS-BOT-BC299744 | Cynara cardunculus | John Thomas Howell | 1953-3-15 | 28922 | Contra Costa | Danville | Comment | |||
| CAS-BOT-BC299745 | Cynara cardunculus | John Thomas Howell | 1953-3-15 | 28922 | Contra Costa | Danville | Comment | |||
| CAS-BOT-BC300969 | Eriophyllum lanatum var. achilleoides | John Thomas Howell | 1931-5-12 | 6485 A | Contra Costa | Marsh Creek Road ne. of Mt. Diablo | Comment | |||
| CAS-BOT-BC304579 | Gutierrezia californica | John Thomas Howell | 1929-9-21 | 4394 | Contra Costa | Marsh Creek Road 10 1/2 miles se. of Clayton | Comment | |||
| CAS-BOT-BC305221 | Grindelia hirsutula | J. T. Howell | 1930-9-28 | 5496 | Contra Costa | Liberty School on Marsh Creek Road | Comment | |||
| CAS-BOT-BC305224 | Grindelia hirsutula | John Thomas Howell | 1930-9-28 | 5495 | Contra Costa | Liberty School on Marsh Creek Road | Comment | |||
| CAS-BOT-BC305229 | Grindelia hirsutula | John Thomas Howell | 1929-7-7 | 4322 | Contra Costa | 2 miles s. of Rodeo | Comment | |||
| CAS-BOT-BC305230 | Grindelia hirsutula | John Thomas Howell | 1930-9-28 | 5486 | Contra Costa | Tunnel Road near Oak Spring | Comment | |||
| CAS-BOT-BC305231 | Grindelia hirsutula | John Thomas Howell | 1929-7-7 | 4322 | Contra Costa | 2 miles south of Rodeo | Comment | |||
| CAS-BOT-BC305240 | Grindelia hirsutula | John Thomas Howell | 1929-9-21 | 4387 | Contra Costa | 4 miles west of Clayton | Comment | |||
| CAS-BOT-BC305241 | Grindelia hirsutula | John Thomas Howell | 1929-9-21 | 4396 | Contra Costa | Marsh Creek Road 3.5 miles sw. of Brentwood | Comment | |||
| CAS-BOT-BC305242 | Grindelia hirsutula | John Thomas Howell | 1929-9-21 | 4387 | Contra Costa | 4 miles west of Clayton | Comment | |||
| CAS-BOT-BC305245 | Grindelia hirsutula | John Thomas Howell | 1954-9-5 | 30027 | Contra Costa | Marsh Creek Road 8 miles from Byron | Comment | |||
| CAS-BOT-BC305248 | Grindelia hirsutula | John Thomas Howell | 1930-9-28 | 5486 | Contra Costa | Tunnel Road near Oak Spring | Comment | |||
| CAS-BOT-BC305250 | Grindelia hirsutula | John Thomas Howell | 1932-10-8 | 10796 | Contra Costa | Tidal flat at mouth of Rodeo Creek | Comment | |||
| CAS-BOT-BC306337 | Helenium | John Thomas Howell | 1926-1-16 | 1626 | Contra Costa | San Leandro Canyon, Oakland Hills | Comment | |||
| CAS-BOT-BC309407 | Helenium puberulum | John Thomas Howell; Gordon H. True | 1972-6-29 | 48932 | Contra Costa | On Byron Hot Springs Road southeast of Byron | Comment | |||
| CAS-BOT-BC310191 | Hesperevax sparsiflora var. sparsiflora | John Thomas Howell | 1930-4-22 | 4749 | Contra Costa | Bald Peak | Comment | |||
| CAS-BOT-BC311160 | Heterotheca sessiliflora subsp. bolanderi | John Thomas Howell | 1930-7-31 | 5416 | Contra Costa | North Berkeley Hills | Comment | |||
| CAS-BOT-BC31330 | Bolboschoenus maritimus | John Thomas Howell | 1978-9-5 | 53356 | Contra Costa | Pittsburg Marina. | Comment | |||
| CAS-BOT-BC31331 | Bolboschoenus maritimus | John Thomas Howell; Gordon H. True | 1972-6-29 | 48943 | Contra Costa | Low places along Byron Hot Springs Road, SE of Byron. | Comment | |||
| CAS-BOT-BC31392 | Bolboschoenus robustus | John Thomas Howell | 1932-10-8 | 10794 | Contra Costa | Tidal Flat at mouth of Rodeo Creek. | Comment | |||
| CAS-BOT-BC314865 | Hemizonia congesta subsp. luzulifolia | John Thomas Howell | 1929-9-21 | 4386 | Contra Costa | 4 miles west of Clayton | Comment | |||
| CAS-BOT-BC314866 | Hemizonia congesta subsp. luzulifolia | John Thomas Howell | 1925-12-6 | 1612 | Contra Costa | Ridge between Redwood Canyon and San Leandro Canyon, Oakland Hills | Comment | |||
| CAS-BOT-BC314867 | Hemizonia congesta subsp. luzulifolia | John Thomas Howell | 1955-8-24 | 30900 | Contra Costa | Near Diablo Country Club | Comment | |||
| CAS-BOT-BC320201 | Holocarpha heermannii | John Thomas Howell | 1955-8-24 | 30901 | Contra Costa | Near Diablo Country Club | Comment | |||
| CAS-BOT-BC320247 | Holocarpha obconica | John Thomas Howell | 1930-9-28 | 5500 | Contra Costa | 6.3 miles from Byron on Marsh Creek Road | Comment | |||
| CAS-BOT-BC320248 | Holocarpha obconica | John Thomas Howell | 1930-9-28 | 5501 | Contra Costa | On the Marsh Creek Road, 5.4 miles from Byron | Comment | |||
| CAS-BOT-BC320260 | Holocarpha obconica | John Thomas Howell | 1930-9-28 | 5501 | Contra Costa | On the Marsh Creek Road, 5.4 miles from Byron | Comment | |||
| CAS-BOT-BC320329 | Holocarpha virgata | John Thomas Howell | 1930-9-28 | 5502 | Contra Costa | 5.4 miles from Byron, on Marsh Creek Road | Comment | |||
| CAS-BOT-BC321748 | Layia gaillardioides | John Thomas Howell | 1941-4-6 | 16176 | Contra Costa | Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC321749 | Layia gaillardioides | John Thomas Howell | 1941-4-6 | 16176 | Contra Costa | Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC324618 | Holocarpha virgata | John Thomas Howell | 1930-9-28 | 5502 | Contra Costa | On the Marsh Creek Road 5.4 miles from Byron | Comment | |||
| CAS-BOT-BC324619 | Holocarpha virgata | John Thomas Howell | 1929-9-21 | 4389 | Contra Costa | 5 miles southeast of Clayton on Marsh Creek Road | Comment | |||
| CAS-BOT-BC325829 | Holocarpha heermannii | John Thomas Howell | 1930-9-28 | 5487 | Contra Costa | 1 mile from Walnut Creek on Walnut Avenue to Concord | Comment | |||
| CAS-BOT-BC325830 | Holocarpha heermannii | John Thomas Howell | 1930-9-28 | 5487 | Contra Costa | 1 mile from Walnut Creek on Walnut Avenue to Concord | Comment | |||
| CAS-BOT-BC325831 | Holocarpha heermannii | John Thomas Howell | 1930-9-28 | 5499 | Contra Costa | 6.3 miles from Byron on teh Marsh Creek Road | Comment | |||
| CAS-BOT-BC325832 | Holocarpha heermannii | John Thomas Howell | 1930-9-28 | 5499 | Contra Costa | 6.3 miles from Byron on teh Marsh Creek Road | Comment | |||
| CAS-BOT-BC325833 | Holocarpha heermannii | John Thomas Howell | 1929-9-21 | 4389 | Contra Costa | 5 miles se. of Clayton on Marsh Creek Road | Comment | |||
| CAS-BOT-BC327382 | Senecio aphanactis | John Thomas Howell | 1933-3-29 | 10900 | Contra Costa | Nortonville hills | Comment | |||
| CAS-BOT-BC327987 | Pentachaeta alsinoides | John Thomas Howell | 1931-5-12 | 6476 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC334184 | Acer negundo var. californicum | John Thomas Howell | 1925-11-7 | 1549 | Contra Costa | Between Pinehurst and Canyon Station, San Leandro Canyon | Comment | |||
| CAS-BOT-BC340425 | Lactuca saligna | John Thomas Howell | 1932-10-16 | 10819 | Contra Costa | Near San Ramon | Comment | |||
| CAS-BOT-BC340540 | Lactuca serriola | John Thomas Howell; Gordon H. True | 1972-7-29 | 48918 | Contra Costa | On Byron Hot Springs Road southeast of Byron | Comment | |||
| CAS-BOT-BC340541 | Lactuca serriola | John Thomas Howell; Gordon H. True | 1972-7-29 | s.n. | Contra Costa | On Byron Hot Springs Road southeast of Byron | Comment | |||
| CAS-BOT-BC340695 | Lactuca virosa | John Thomas Howell | 1943-8-22 | 19310 | Contra Costa | Pinehurst Canyon, Oakland Hills | Comment | |||
| CAS-BOT-BC340696 | Lactuca virosa | John Thomas Howell | 1943-8-22 | 19310 | Contra Costa | Near head of San Leandro Creek Canyon | 243 | Comment | ||
| CAS-BOT-BC340697 | Lactuca virosa | John Thomas Howell | 1942-6-28 | 17004 | Contra Costa | Oakland Hills near Redwood Peak | Comment | |||
| CAS-BOT-BC340698 | Lactuca virosa | John Thomas Howell | 1942-7-19 | 17040 | Contra Costa | Along trail west of Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC340699 | Lactuca virosa | John Thomas Howell | 1943-8-22 | 19310 | Contra Costa | Near head of San Leandro Creek Canyon | 243 | Comment | ||
| CAS-BOT-BC340700 | Lactuca virosa | John Thomas Howell | 1943-8-22 | 19310 | Contra Costa | Near head of San Leandro Creek Canyon | 243 | Comment | ||
| CAS-BOT-BC341474 | Lagophylla ramosissima | John Thomas Howell | 1925-11-1 | 1550 | Contra Costa | Hillside near Pinehurst, San Leandro Canyon | Comment | |||
| CAS-BOT-BC341475 | Lagophylla ramosissima | John Thomas Howell | 1930-9-28 | 5494 | Contra Costa | Marsh Creek Road, 7 miles east of Clayton | Comment | |||
| CAS-BOT-BC342983 | Madia gracilis | John Thomas Howell | 1931-5-12 | 6484 | Contra Costa | North side of Mt. Diablo | Comment | |||
| CAS-BOT-BC344327 | Madia exigua | John Thomas Howell | 1931-5-12 | 6473 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC348649 | Micropus californicus var. subvestitus | John Thomas Howell | 1930-4-22 | 4746 | Contra Costa | Wildcat Canyon | Comment | |||
| CAS-BOT-BC356973 | Pseudognaphalium luteoalbum | John Thomas Howell; Gordon H. True | 1972-6-29 | 48934 | Contra Costa | On Byron Hot Springs Road southeast of Byron | Comment | |||
| CAS-BOT-BC357444 | Pseudognaphalium ramosissimum | John Thomas Howell | 1925-11-7 | 1558 | Contra Costa | San Leandro Canyon, Oakland Hills | Comment | |||
| CAS-BOT-BC357592 | Pseudognaphalium stramineum | John Thomas Howell | 1925-11-7 | 1556 | Contra Costa | San Leandro Canyon, Oakland Hills | Comment | |||
| CAS-BOT-BC361878 | Psilocarphus tenellus | John Thomas Howell | 1930-4-22 | 4748 | Contra Costa | Bald Peak | Comment | |||
| CAS-BOT-BC365985 | Sonchus asper | John Thomas Howell | 1933-5-14 | 11248 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC366306 | Lasthenia minor | J. T. Howell | 1933-3-29 | 10895 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC376774 | Tanacetum parthenium | John Thomas Howell | 1942-6-28 | 17006 | Contra Costa | Oakland Hills near Redwood Peak | Comment | |||
| CAS-BOT-BC393980 | Stellaria nitens | John Thomas Howell | 1927-3-6 | 2284 | Contra Costa | summit of Shell Ridge | 243 | Comment | ||
| CAS-BOT-BC400500 | Asarum caudatum | John Thomas Howell | 1925-9-12 | 1439 | Contra Costa | San Leandro Canon [Canyon], Oakland Hills | Comment | |||
| CAS-BOT-BC40763 | Erysimum capitatum | John Thomas Howell | 1926-3-7 | 1672 | Contra Costa | Mount Diablo. Near the summit on south side. | Comment | |||
| CAS-BOT-BC417826 | Sedella pentandra | John Thomas Howell | 1941-4-6 | 16182 | Contra Costa | Near Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC421738 | Rumex conglomeratus | John Thomas Howell; Gordon H. True | 1972-6-29 | 48935 | Contra Costa | On Byron Hot Springs Road southeast of Byron | Comment | |||
| CAS-BOT-BC422911 | Stylomecon heterophylla | John Thomas Howell | 1931-5-12 | 6480 | Contra Costa | North side of Mt. Diablo | Comment | |||
| CAS-BOT-BC439168 | Claytonia exigua subsp. exigua | John Thomas Howell | 1926-3-7 | 1678 | Contra Costa | Mitchell Canon [Canyon], Mt. Diablo | Comment | |||
| CAS-BOT-BC439929 | Claytonia perfoliata subsp. mexicana | John Thomas Howell | 1933-5-14 | 11251 | Contra Costa | Hills east of St. Mary's | Comment | |||
| CAS-BOT-BC46098 | Agoseris hirsuta | John Thomas Howell | 1925-12-6 | 1611 | Contra Costa | Ridge between Redwood Canon and San Leandro Canon, Oakland Hills | Comment | |||
| CAS-BOT-BC469115 | Allium falcifolium | John Thomas Howell | 1941-4-6 | 16179 | Contra Costa | Ridge east of Deer Flat, Mt. Diablo | Comment | |||
| CAS-BOT-BC475532 | Allium serra | John Thomas Howell | 1933-5-14 | 11284 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC476607 | Allium unifolium | John Thomas Howell | 1931-5-12 | 6469 | Contra Costa | Oakland Hills | Comment | |||
| CAS-BOT-BC494047 | Calochortus venustus | John Thomas Howell | 1931-5-12 | 6471 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC500091 | Dichelostemma capitatum | John Thomas Howell | 1944-7-17 | 19831 | Contra Costa | Canyon of Snow Basin Creek | Comment | |||
| CAS-BOT-BC500251 | Orobanche uniflora subsp. occidentalis | John Thomas Howell | 1940-4-21 | 15401 | Contra Costa | Pine Canyon, Mt. Diablo | Comment | |||
| CAS-BOT-BC502555 | Dichelostemma congestum | John Thomas Howell | 1933-5-14 | 11258 | Contra Costa | Hills east of St. Mary's College | Comment | |||
| CAS-BOT-BC502955 | Orobanche vallicola | John Thomas Howell | 1929-9-21 | 4391 | Contra Costa | Marsh Creek Road, 7 miles SE of Clayton | Comment | |||
| CAS-BOT-BC522175 | Triteleia laxa | John Thomas Howell | 1931-5-12 | 6468 | Contra Costa | Oakland Hills | Comment | |||
| CAS-BOT-BC526326 | Triteleia laxa | John Thomas Howell | 1931-5-12 | 6468 | Contra Costa | Oakland Hills | Comment | |||
| CAS-BOT-BC55300 | Hirschfeldia incana | John Thomas Howell; Gordon H. True | 1972-6-29 | 48929 | Contra Costa | Byron Hot Springs Road southeast of Byron. | Comment | |||
| CAS-BOT-BC66352 | Cheilanthes covillei | John Thomas Howell | 1955-3-6 | 30146 | Contra Costa | on south side of South Peak, Mt. Diablo | Comment | |||
| CAS-BOT-BC70278 | Cheilanthes intertexta | John Thomas Howell | 1955-3-6 | 30145 | Contra Costa | between South & North peaks of Mt. Diablo | Comment | |||
| CAS-BOT-BC8186 | Malvastrum howellii | John Thomas Howell | 1931-5-12 | 6470 | Contra Costa | Nortonville | Comment | |||
| CAS-BOT-BC88253 | Thysanocarpus curvipes | John Thomas Howell | 1934-4-1 | 11821 | Contra Costa | Marsh Creek Road southwest of Brentwood. | Comment | |||
| CAS-BOT-BC88254 | Thysanocarpus curvipes | John Thomas Howell | 1934-4-8 | 11821 | Contra Costa | Marsh Creek Road southwest of Brentwood. | Comment | |||
| CAS-BOT-BC88255 | Thysanocarpus curvipes | John Thomas Howell | 1934-4-8 | 11822 | Contra Costa | Marsh Creek Road southwest of Brentwood. | Comment | |||
| CAS-BOT-BC88703 | Lepidium acutidens | John Thomas Howell | 1933-3-29 | 10894 | Contra Costa | Nortonville. | Comment | |||
| CAS-BOT-BC90295 | Artemisia douglasiana | John Thomas Howell | 1925-9-19 | 1467 | Contra Costa | East side of Moraga Ridge near south end, Oakland Hills | Comment | |||
| CAS-BOT-BC90299 | Artemisia douglasiana | John Thomas Howell; Gordon H. True | 1972-6-29 | 48945 | Contra Costa | Low places along Byron Hot Springs Road where water has stood, southeast of Byron | Comment | |||
| CAS-BOT-BC92920 | Ribes californicum var. californicum | John Thomas Howell | 1931-2-21 | 5730 | Contra Costa | North side of Mount Diablo. | Comment | |||
| CAS-BOT-BC9612 | Delphinium californicum | John Thomas Howell | 1950-7-5 | 26631 | Contra Costa | Juniper Camp, Mt. Diablo | Comment | |||
| CAS-BOT-BC98040 | Symphyotrichum lentum | John Thomas Howell | 1978-9-5 | 53357 | Contra Costa | Pittsburg Marina | Comment | |||
| CAS-BOT-BC98764 | Baccharis douglasii | John Thomas Howell | 1926-1-17 | 1627 | Contra Costa | Between Cashion and las Trampas Ridge | Comment | |||
| CDA7515 | Lactuca virosa | J. T. Howell | 1943-8-22 | 19310 | Contra Costa | Near head of San Leandro Creek Canyon. | Comment | |||
| JEPS21278 | Baccharis glutinosa | J. Thomas Howell | 1926-1-17 | 1627 | Contra Costa | between Cashion and Las Trampas Ridge Cashion | Comment | |||
| JEPS62457 | Pogogyne serpylloides | John Thomas Howell | 1930-4-22 | 4747 | Contra Costa | Bald Peak, Berkeley Hills. | Comment | |||
| LA203994 | Holocarpha virgata | John Thomas Howell; | 1930-9-28 | 5501 | Contra Costa | on the Marsh Creek Road, 5.4 mi. from Byron | Comment | |||
| LA204280 | Cardamine californica | John Thomas Howell; | 1931-3-10 | 5757 | Contra Costa | Mt. Diablo, 7 miles from Clayton on Livermore road | Comment | |||
| LA204675 | Atriplex coronata | John Thomas Howell; | 1930-9-28 | 5503 | Contra Costa | 5.4 miles from Byron on Marsh Creek Road | Comment | |||
| POM179710 | Eriogonum nudum var. auriculatum | J. T. Howell | 1930-7-4 | 5337 | Contra Costa | Rocky hilltop in the north Berkeley Hills. | Comment | |||
| POM179764 | Holocarpha virgata subsp. virgata | J. T. Howell | 1930-9-28 | 5500 | Contra Costa | 6.3 miles from Byron on the Marsh Creek Road. | Comment | |||
| POM179765 | Holocarpha heermannii | J. T. Howell | 1930-9-28 | 5499 | Contra Costa | 6.3 miles from Byron on the Marsh Creek Road. | Comment | |||
| POM179767 | Holocarpha virgata subsp. virgata | J. T. Howell | 1930-9-28 | 5502 | Contra Costa | 5.4 miles from Byron on Marsh Creek Road. | Comment | |||
| POM180746 | Heterotheca sessiliflora subsp. echioides | J. T. Howell | 1930-7-31 | 5416 | Contra Costa | North Berkeley Hills. | Comment | |||
| POM180792 | Quercus wislizeni | J. T. Howell | 1930-6-15 | 5310 | Contra Costa | Summit of Grizzley Peak, Berkeley Hills | Comment | |||
| POM181072 | Hemizonia pungens subsp. pungens | J. T. Howell | 1930-9-28 | 5489 | Contra Costa | 2 miles from Concord on road to Walnut Creek. | Comment | |||
| POM181083 | Atriplex coronata | J. T. Howell | 1930-9-28 | 5503 | Contra Costa | 5.4 miles from Byron on Marsh Creek Road. | Comment | |||
| POM183312 | Atriplex subspicata | J. T. Howell | 1931-10-31 | 8163 | Contra Costa | Bay Point. | Comment | |||
| POM193965 | Grindelia hirsutula var. davyi | J. T. Howell | 1929-7-7 | 4332 | Contra Costa | 2 miles S of Rodeo. | Comment | |||
| POM193972 | Pogogyne serpylloides | J. T. Howell | 1930-4-22 | 4747 | Contra Costa | Bald Peak | Comment | |||
| POM194201 | Boisduvalia glabella | J. T. Howell | 1929-7-20 | 4331 | Contra Costa | Pittsburg | Comment | |||
| POM194216 | Croton californicus | J. T. Howell | 1926-12-27 | 2273 | Contra Costa | 1.5 miles s. of Oakley. | Comment | |||
| POM196479 | Eriogonum | J. T. Howell | 1929-9-21 | 7392 | Contra Costa | Marsh Creek Road 8 miles southeast of Clayton | Comment | |||
| POM203034 | Collinsia sparsiflora var. collina | J. T. Howell | 1934-4-8 | 11810 | Contra Costa | 7 miles from Clayton on road to Livermore. | Comment | |||
| POM203036 | Thysanocarpus curvipes var. curvipes | J. T. Howell | 1934-4-8 | 11822 | Contra Costa | Marsh Creek Road, SW of Brentwood. | Comment | |||
| POM203037 | Ptelea baldwinii subsp. crenulata | J. T. Howell | 1934-4-8 | 11811 | Contra Costa | 7 miles from Clayton on road to Livermore. | Comment | |||
| POM203038 | Delphinium hesperium subsp. pallescens | J. T. Howell | 1934-4-8 | 11824 | Contra Costa | South of Antioch | Comment | |||
| POM203314 | Dodecatheon hendersonii subsp. cruciatum | J. T. Howell | 1931-3-10 | 5756 | Contra Costa | East side of Mt. Diablo 7 miles from Clayton on Livermore road. | Comment | |||
| POM203316 | Hesperolinon micranthum | J. T. Howell | 1931-5-12 | 6472 | Contra Costa | Nortonville | Comment | |||
| POM203445 | Eriophyllum lanatum var. achilleoides | J. T. Howell | 1931-5-12 | 6485 A | Contra Costa | Marsh Creek Road NE of Mt. Diablo | Comment | |||
| POM203632 | Trifolium ciliolatum | J. T. Howell | 11245 | Contra Costa | Hills east of St. Marys College. | Comment | ||||
| POM203635 | Trifolium bifidum var. decipiens | J. T. Howell | 1933-5-14 | 11264 | Contra Costa | Hills east of St. Marys college | Comment | |||
| POM203638 | Platystemon californicus var. californicus | J. T. Howell | 1933-5-14 | 11277 | Contra Costa | Hills east of St. Mary's college | Comment | |||
| POM203648 | Cardamine californica var. integrifolia | J. T. Howell | 1933-5-14 | 11255 | Contra Costa | Hills east of St. Mary s college | Comment | |||
| POM203649 | Aquilegia formosa var. truncata | J. T. Howell | 1933-5-14 | 11253 | Contra Costa | Hills east of St. Mary's college | Comment | |||
| POM203654 | Lithophragma affine subsp. affine | John T. Howell | 1933-5-14 | 11280 | Contra Costa | Hills east of St. Mary s college | Comment | |||
| POM203659 | Agoseris heterophylla | John T. Howell | 1933-5-14 | 11260 | Contra Costa | Hills east of St. Mary's college | Comment | |||
| POM203716 | Triteleia laxa | J. T. Howell | 1931-5-12 | 6468 | Contra Costa | Oakland Hills | Comment | |||
| POM203838 | Juncus xiphioides | J. T. Howell | 1934-5-14 | 11239 | Contra Costa | St. Mary s College. | Comment | |||
| POM203934 | Delphinium patens | J. T. Howell | 1931-3-10 | 5758 | Contra Costa | East side of Mt. Diablo 7 miles from Clayton on Livermore road. | Comment | |||
| POM204444 | Lepidium dictyotum var. acutidens | J. T. Howell | 1933-3-29 | 10894 | Contra Costa | Nortonville | Comment | |||
| POM204460 | Phacelia ciliata | J. T. Howell | 1933-3-29 | 10915 | Contra Costa | Near Pittsburg. | Comment | |||
| POM204479 | Nemophila heterophylla | J. T. Howell | 1933-5-14 | 11218 | Contra Costa | Hills east of St. Mary s college | Comment | |||
| POM204480 | Mimulus guttatus | J. T. Howell | 1933-5-14 | 11242 | Contra Costa | St. Mary's College | Comment | |||
| POM204481 | Solanum umbelliferum | J. T. Howell | 1933-5-14 | 11291 | Contra Costa | Hills east of St. Mary's college | Comment | |||
| POM215114 | Stachys ajugoides | J. T. Howell | 1932-10-16 | 10818 | Contra Costa | Near San Ramon. | Comment | |||
| POM225347 | Delphinium hesperium | J. T. Howell | 1931-5-12 | 6482 | Contra Costa | N side of Mt Diablo | Comment | |||
| POM225551 | Cardamine californica var. integrifolia | J. T. Howell | 1931-3-10 | 5757 | Contra Costa | East side of Mt. Diablo 7 miles from Clayton on Livermore road. | Comment | |||
| POM225552 | Athysanus pusillus | J. T. Howell | 1931-3-10 | 5754 | Contra Costa | East side of Mt. Diablo 7 miles from Clayton on Livermore road. | Comment | |||
| POM225662 | Claytonia perfoliata | J. T. Howell | 1931-3-10 | 5755 | Contra Costa | East side of Mt. Diablo 7 miles from Clayton on Livermore road. | Comment | |||
| POM225873 | Wyethia helenioides | J. T. Howell | 1933-5-14 | 11287 | Contra Costa | Hills east of St. Mary's college | Comment | |||
| POM226096 | Marah fabacea | J. T. Howell | 1933-3-29 | 10902 | Contra Costa | Nortonville hills. | Comment | |||
| POM226098 | Plagiobothrys bracteatus | J. T. Howell | 1933-5-14 | 11232 | Contra Costa | St. Mary s College | Comment | |||
| POM226232 | Carduus tenuiflorus | J. T. Howell | 1933-5-21 | 11323 | Contra Costa | San Pablo | Comment | |||
| POM261437 | Mimulus guttatus | J. T. Howell | 1940-4-21 | 15402 | Contra Costa | Pine Canyon, Mount Diablo | Comment | |||
| POM303721 | Lactuca virosa | J. T. Howell | 1943-8-22 | 19310 | Contra Costa | Near head of San Leandro Creek Canyon. | 244 | Comment | ||
| RSA0004205 | Malvastrum howellii | J. T. Howell | 1931-5-12 | 6470 | Contra Costa | Nortonville | Comment | |||
| RSA0006003 | Cordylanthus nidularius | J. T. Howell | 1942-7-19 | 17044 | Contra Costa | Northeast of Deer Flat, Mount Diablo | Comment | |||
| RSA0006004 | Cordylanthus nidularius | J. T. Howell | 1942-7-19 | 17044 | Contra Costa | Northeast of Deer Flat, Mount Diablo | Comment | |||
| RSA0021635 | Ribes malvaceum | J. T. Howell | 1926-3-7 | 1667 | Contra Costa | Mt. Diablo. | Comment | |||
| RSA0022137 | Pogogyne serpylloides | J. T. Howell | 1930-4-22 | 4747 | Contra Costa | Bald Peak | Comment | |||
| RSA0039373 | Thysanocarpus curvipes var. curvipes | John Thomas Howell | 1934-4-8 | 11821 | Contra Costa | Marsh Creek Road SW of Brentwood. | Comment | |||
| RSA0070867 | Cirsium quercetorum | J. T. Howell | 1938-6-30 | 13940 | Contra Costa | Berkeley Hills on NE slope near head of Wildcat Canyon. | Comment | |||
| RSA118092 | Paspalum dilatatum | J. T. Howell | 1954-9-5 | 30025 | Contra Costa | Along road, Marsh Creek Springs Park | Comment | |||
| RSA136731 | Cordylanthus pilosus subsp. pilosus | J. T. Howell | 1955-8-24 | 30902 | Contra Costa | Near Diablo County Club, south base of Mt. Diablo. | Comment | |||
| RSA136732 | Eriogonum | J. T. Howell | 1955-8-24 | 30903 | Contra Costa | Near summit of south peak, Mt. Diablo | Comment | |||
| RSA136734 | Eryngium aristulatum var. aristulatum | J. T. Howell | 1955-8-24 | 30899 | Contra Costa | Near Diablo Country Club | Comment | |||
| RSA136762 | Holocarpha heermannii | J. T. Howell | 1955-8-24 | 30901 | Contra Costa | Near Diablo County Club, south base of Mt. Diablo. | Comment | |||
| RSA137090 | Hemizonia fitchii | J. T. Howell | 1955-8-24 | 30904 | Contra Costa | Mt. Diablo near Turtle Rock. | 259 | Comment | ||
| RSA137096 | Hemizonia luzulifolia | J. T. Howell | 1955-8-24 | 30900 | Contra Costa | Near Diablo County Club, south base of Mt. Diablo. | Comment | |||
| RSA201409 | Amsinckia intermedia | J. T. Howell | 1933-5-14 | 11225 | Contra Costa | St. Mary s College | Comment | |||
| RSA203627 | Lupinus bicolor subsp. tridentatus | J. T. Howell | 1933-5-14 | 11250 | Contra Costa | Hills east of St. Marys college | Comment | |||
| RSA22143 | Navarretia mellita | J. T. Howell | 1938-6-30 | 13938 | Contra Costa | Head of Siesta Valley | Comment | |||
| RSA244713 | Atriplex fruticulosa | J. T. Howell, G. True | 1972-6-29 | 48917 | Contra Costa | On Byron Hot Springs Road SE of Byron. | Comment | |||
| RSA26408 | Allium falcifolium | J. T. Howell | 1941-4-6 | 16179 | Contra Costa | Ridge east of Deer Park, Mt. Diablo | Comment | |||
| RSA40156 | Lactuca virosa | J. T. Howell | 1943-8-22 | 19310 | Contra Costa | Near head of San Leandro Creek Canyon. | 244 | Comment | ||
| RSA461371 | Dodecatheon hendersonii | J. T. Howell | 1931-3-10 | 5756 | Contra Costa | East side of Mt. Diablo 7 miles from Clayton on Livermore road. | Comment | |||
| RSA61570 | Trifolium gracilentum | J. T. Howell | 1933-5-14 | 11249 | Contra Costa | Hills east of St. Marys college | Comment | |||
| RSA66572 | Lepidium dictyotum var. acutidens | J. T. Howell | 1933-3-29 | 10894 | Contra Costa | Nortonville | Comment | |||
| RSA77636 | Marah fabacea | J. T. Howell | 1933-3-29 | 10903 | Contra Costa | Nortonville hills. | Comment | |||
| RSA83391 | Monardella douglasii | J. T. Howell | 1942-7-19 | 17049 | Contra Costa | Northeast of Deer Flat, Mount Diablo | Comment | |||
| RSA8522 | Lasthenia minor | J. T. Howell | 1933-3-29 | 10895 | Contra Costa | Nortonville | Comment | |||
| RSA8523 | Agoseris heterophylla | J. T. Howell | 1933-5-14 | 11260 | Contra Costa | Hills east of St. Mary's college | Comment | |||
| RSA8534 | Carduus pycnocephalus | J. T. Howell | 1933-5-14 | 11246 | Contra Costa | Hills east of St. Mary's college | Comment | |||
| RSA90931 | Trifolium microdon | J. T. Howell | 1933-5-14 | 11244 | Contra Costa | St. Mary's College. | Comment | |||
| RSA90947 | Trifolium fucatum var. fucatum | J. T. Howell | 1933-5-14 | 11237 | Contra Costa | St. Mary's College. | Comment | |||
| RSA91445 | Hesperolinon breweri | J. T. Howell | 1942-7-19 | s.n. | Contra Costa | Northeast of Deer Flat, Mount Diablo | Comment | |||
| RSA91555 | Trifolium willdenovii | J. T. Howell | 1933-5-14 | 11231 | Contra Costa | St. Mary's College. | Comment | |||
| RSA94065 | Holocarpha virgata subsp. virgata | J. T. Howell | 1930-9-28 | 5501 | Contra Costa | 5.4 miles from Byron on Marsh Creek Road. | Comment | |||
| RSA97189 | Downingia insignis | J. T. Howell | 1953-4-26 | 28935 | Contra Costa | Between Byron and Byron Hot Springs. | Comment | |||
| RSA97649 | Eriophyllum lanatum var. achilleoides | J. T. Howell | 1950-7-5 | 26636 | Contra Costa | Brushy slope above Nortonville | Comment | |||
| SEINET10593167 | Phalaris minor | John Thomas Howell | 1933-5-14 | Howell 11234 | Contra Costa | St. Mary's College | Comment | |||
SEINET10853324  |
Malacothamnus hallii | John Thomas Howell | 1931-5-12 | Howell 6470 | Contra Costa | Nortonville. | Comment | |||
| SEINET10925203 |
Grindelia camporum var. parviflora | John Thomas Howell | 1930-9-28 | Howell 5496 | Contra Costa | Liberty School on Marsh Creek Road, Contra Costa Co. | Comment | |||
| SEINET12044746 | Triteleia laxa | J. T. Howell | 1931-1 | 6468 | Contra Costa | Oakland Hills | Comment | |||
| SEINET12044784 | Allium serratum | J. T. Howell | 1933-1 | 11284 | Contra Costa | E of St. Mary's College | Comment | |||
| SEINET12086747 | Delphinium hesperium | J. T. Howell | 1931-1 | 6482 | Contra Costa | North Side of Mt. Diablo | Comment | |||
| SEINET12087144 | Delphinium decorum | J. T. Howell | 1933-1 | 11279 | Contra Costa | Hills E of St. Mary's College | Comment | |||
| SEINET12087146 | Delphinium decorum | J. T. Howell | 1931-1 | 5758 | Contra Costa | Shaley slope in chaparral, 7 mi E of Clayton, Mt. Diablo region | Comment | |||
| SEINET12271290 | Navarretia mellita | J. T. Howell | 1938-1 | 13938 | Contra Costa | head of Siesta Valley | Comment | |||
| SEINET183957 | Navarretia mellita | John Thomas Howell | 1938-6-30 | 13938 | Contra Costa | Head od Seista Valley. | Comment | |||
| SEINET3889041 | Triteleia laxa | John Thomas Howell | 1931-5-12 | 6468 | Contra Costa | Oakland Hills.; 0 | Comment | |||
SEINET7262189  |
Solanum umbelliferum | J. T. Howell | 1933-5-14 | 11291 | Contra Costa | E of St. Mary's College | Comment | |||
| UC1988933 | Pogogyne serpylloides | John Thomas Howell | 1930-4-22 | 4747 | Contra Costa | Bald Peak | Comment | |||
| UC421583 | Pogogyne serpylloides | John Thomas Howell | 1930-4-22 | 4747 | Contra Costa | Bald Peak | Comment | |||
| UC473576 | Atriplex triangularis | John Thomas Howell | 1931-10-31 | 8163 | Contra Costa | Bay Point | Comment | |||
| UC691444 | Lactuca virosa | J. T. Howell | 1942-7-1 | 17040 | Contra Costa | Comment | ||||
| UCD116644 | Malva parviflora | John Thomas Howell; Gordon H, True | 1972-6-29 | 48923 | Contra Costa | Byron Hot Springs Road southeast of Byron. | Comment | |||
| UCD119619 | Amsinckia intermedia | John Thomas Howell | 1933-5-14 | 11224 | Contra Costa | St. Mary's College. | Comment | |||
| UCD133508 | Lactuca virosa | John Thomas Howell | 1943-8-22 | 19310 | Contra Costa | near head of San Leandro Creek Canyon. | 243 | Comment | ||
| UCD63839 | Leptochloa fusca subsp. fascicularis | John Thomas Howell | 1972-6-29 | 48944 | Contra Costa | along Byron Hot Springs Road, southeast of Byron. | Comment | |||
| UCD97408 | Atriplex fruticulosa | John Thomas Howell | 1972-6-29 | 48917 | Contra Costa | on Bron Hot Springs Road southeast of Byron. | Comment | |||
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| Copyright © 2019 Regents of the University of California — Updated 11 January 2019 |