Jepson eFlora: Taxon page
Vascular Plants of California
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon


Eriogonum microtheca var. laxiflorum
GREAT BASIN WILD BUCKWHEAT


Higher Taxonomy
Family: PolygonaceaeView DescriptionDichotomous Key
Common Name: BUCKWHEAT FAMILY
Habit: Annual to shrub [tree]. Stem: nodes swollen or not. Leaf: simple, basal or cauline, generally alternate; ocreae present or 0, generally scarious, persistent or not. Inflorescence: flower clusters in axillary to terminal cyme-, panicle-, raceme-, spike-, umbel- or head-like arrangements, entire inflorescence or main inflorescence branches generally subtended by bracts ("inflorescence bracts"); peduncles present or 0; flower clusters in Eriogoneae-Eriogonoideae subtended by involucre of >= 1 free or +- fused, sometimes awn-tipped bracts ("involucre bracts") or, in Polygonoideae and rarely in Eriogonoideae, not (if bracts completely fused, involucre "tubular"); pedicels in Eriogoneae each often subtended by 2 free, transparent, linear bractlets or in Polygonoideae all subtended by 2+ fused, membranous, wide bractlets. Flower: generally bisexual, small, 1--200 per node; perianth parts 2--6, generally in 2 whorls, free or basally fused, generally petal-like, often +- concave adaxially, often darker at midvein, often turning +- red or +- brown in age; stamens [1]3 or 6--9 in 2 whorls; ovary superior, 1-chambered, ovule 1, styles 1--3. Fruit: achenes, included in or exserted from perianth, generally 3-angled, ovoid or elliptic, generally glabrous.
Genera In Family: 48 genera, +- 1200 species: worldwide, especially northern temperate; some cultivated for food (Coccoloba, sea-grape; Fagopyrum, Rheum, Rumex) or ornamental (Antigonon, lovechain; Coccoloba; Muehlenbeckia; Persicaria; Polygonum), a few timbered (Coccoloba; Triplaris). Several (Emex; Fallopia; Persicaria; Polygonum; Rumex) are weeds. Note: Treatment of genera in Eriogonoideae based on monographic work of James L. Reveal. Involucre number throughout is number (1--many) per ultimate grouping, at tips of ultimate branches; flower number is per flower cluster or involucre, unless otherwise stated. Fagopyrum esculentum Moench not naturalized, considered an historical waif (or garden weed +- presently), therefore not treated.
eFlora Treatment Author: Mihai Costea, except as noted
Scientific Editor: Thomas J. Rosatti, Bruce G. Baldwin.
Genus: EriogonumView DescriptionDichotomous Key

Common Name: WILD BUCKWHEAT
Habit: Annual to shrub, matted or not. Stem: prostrate to erect, occasionally 0, glabrous or hairy, occasionally glandular. Leaf: basal, sheathing (on stem above basal, beneath other, +- non-sheathing cauline), or cauline, alternate, opposite, or whorled; blades linear to +- round, generally longer than wide, margins flat, wavy, or rolled under; ocreae 0. Inflorescence: variable, glabrous or hairy, occasionally glandular; peduncles 0 or erect to reflexed (pointed down); involucres 1 or in clusters, tubular, glabrous or hairy, teeth generally 4--10, awns 0. Flower: (2)6--100(200), with a stalk-like base ("flower stipe" or "stipe") or not; perianth generally white to red or yellow, glabrous or hairy, occasionally glandular, lobes 6, generally entire; stamens 9. Fruit: generally brown or black, generally obconic, glabrous or hairy; embryo curved or straight.
Species In Genus: +- 250 species: temperate North America. Etymology: (Greek: woolly knees, for hairy nodes of 1st sp. named) Note: One of largest genera in California; stem in descriptions refers to the main stem(s), not branches of inflorescence. A perennial herb allied to Eriogonum austrinum (S. Stokes) Reveal and Eriogonum moranii Reveal of east-central Baja California, with spreading (rather than reflexed or erect) involucres on peduncles < 2 mm, occurring in DMtns (Bristol, Granite mountains), has been known for nearly 25 years yet remains undescribed. Eriogonum puberulum moved to Johanneshowellia.
eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti
Species: Eriogonum microthecaView Description 


Habit: Subshrub or shrub, 0.2--1.5 dm, (0.6)1--13(16) dm diam. Stem: 0.05--1.5 dm, 0.1--1 dm, generally tomentose or glabrous. Leaf: cauline, blades (0.3)1--3.5 cm, (0.07)0.1--1.2 cm wide, linear to narrow, tomentose abaxially, less so or glabrous adaxially, margin occasionally rolled under. Inflorescence: 0.5--6(12) cm, 1--10(13) cm wide; branches tomentose to hairy or glabrous; peduncles 0 or generally erect, 0.3--1.5 cm, slender, tomentose to hairy; involucres (1.5)2--3.5(4) mm, 1.3--2.5(3) mm wide, tomentose to hairy or glabrous. Flower: 1.5--3(4) mm, glabrous; perianth yellow or white to pink, orange, rose, red (or cream), lobes oblong to obovate. Fruit: 1.5--3 mm, glabrous.
Note: Other varieties in Oregon, Idaho, Nevada, Utah.
Eriogonum microtheca var. laxiflorum Hook.
NATIVE
Habit: Subshrub (1)2--4(5) dm, 3--8 dm diam. Stem: 0.2--0.6(0.8) dm, generally tomentose to hairy. Leaf: (0.5)1--2(2.5) cm, (0.1)0.2--0.6(0.8) cm wide, narrow, tomentose abaxially, tomentose to hairy adaxially. Inflorescence: (1)2--4(8) cm; branches sparsely tomentose or glabrous; involucres 2--3(3.5) mm, generally +- glabrous. Flower: 2--3 mm; perianth white to pink or rose. Fruit: 2--3 mm.
Ecology: Common. Sand, gravel or rocks; Elevation: (400)1500--3200 m. Bioregional Distribution: SNH (e slope), GB; Distribution Outside California: to Washington, Montana, Colorado, northern Arizona. Flowering Time: Jun--Oct
Synonyms: Eriogonum confertiflorum Benth.; Eriogonum intricatum (Gand.) Prain; Eriogonum microtheca subsp. confertiflorum (Benth.) S. Stokes; Eriogonum microtheca var. confertiflorum (Benth.) Torr. & A. Gray; Eriogonum microtheca subsp. intricatum Gand.; Eriogonum microtheca subsp. laxiflorum (Hook.) S. Stokes; Eriogonum microtheca subsp. spathulare Gand.; Eriogonum microtheca var. spathulare (Gand.) S. Stokes; Eriogonum spathulare (Gand.) Prain; Eriogonum tenellum Torr. var. grandiflorum Gand.; Eriogonum tenellum var. sessiliflorum Gand.
Jepson eFlora Author: James L. Reveal & Thomas J. Rosatti
Jepson Online Interchange

Previous taxon: Eriogonum microtheca var. lapidicola
Next taxon: Eriogonum microtheca var. panamintense

Name Search

Contact/Feedback

Citation for this treatment: James L. Reveal & Thomas J. Rosatti 2012, Eriogonum microtheca var. laxiflorum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=101987, accessed on September 23, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on September 23, 2019.

No expert verified images found for Eriogonum microtheca var. laxiflorum.



Geographic subdivisions for Eriogonum microtheca var. laxiflorum:
SNH (e slope), GB
MAP CONTROLS
1. You can change the display of the base map and layers by clicking on the layer control box in the upper right-hand corner.
2. California county polygons can be turned off and on in the layer control box.
3. Filling of Jepson subdivision polygons can be turned off and on in the layer control box.
4. Moving the cursor over any numbered cluster will show the range boundary of the included specimens (with a blue polygon).
5. Marker clustering can be turned off by clicking this link:      Marker Clustering OFF
WARNING: Turning this off might cause maps with large numbers of specimens to load slowly.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).





 

View elevation by latitude chart


Data provided by the participants of the  Consortium of California Herbaria.
MAP LEGEND
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
READ ABOUT YELLOW FLAGS


CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.