Jepson eFlora: Taxon page
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
Bothriochloa laguroides subsp. torreyana
SILVER BLUESTEM

Higher Taxonomy
Family: Poaceae (Gramineae)View DescriptionDichotomous Key

Common Name: GRASS FAMILY
Habit: Annual to woody perennial herb; roots generally fibrous. Stem: generally round, hollow; nodes swollen, solid. Leaf: alternate, 2-ranked, generally linear, parallel-veined; sheath generally open; ligule membranous or hairy, at blade base. Inflorescence: various (of generally many spikelets). Spikelet: glumes generally 2; florets (lemma, palea, flower) 1--many; lemma generally membranous, sometimes glume-like; palea generally +- transparent, +- enclosed by lemma. Flower: generally bisexual, minute; perianth vestigial; stamens generally 3; stigmas generally 2, generally plumose. Fruit: grain, sometimes achene- or utricle-like.
Genera In Family: 650--900 genera; +- 10550 species: worldwide; greatest economic importance of any family (wheat, rice, maize, millet, sorghum, sugar cane, forage crops, ornamental, weeds; thatching, weaving, building materials). Note: Generally wind-pollinated. Achnatherum, Ampelodesmos, Hesperostipa, Nassella, Piptatherum, Piptochaetium, Ptilagrostis moved to Stipa; Elytrigia, Leymus, Pascopyrum, Pseudoroegneria, Taeniatherum to Elymus; Hierochloe to Anthoxanthum; Lolium, Vulpia to Festuca; Lycurus to Muhlenbergia; Monanthochloe to Distichlis; Pleuraphis to Hilaria; Rhynchelytrum to Melinis. The following taxa (in genera not included here), recorded in California from historical collections or reported in literature, are extirpated, lacking vouchers, or not considered naturalized: Acrachne racemosa (Roth) Ohwi, Allolepis texana (Vasey) Soderstr. & H.F. Decker, Amphibromus nervosus (Hook. f.) Baill., Axonopus affinis Chase, Axonopus fissifolius (Raddi) Kuhlm., Coix lacryma-jobi L., Cutandia memphitica (Spreng.) K. Richt., Dinebra retroflexa (Vahl) Panz., Eremochloa ciliaris (L.) Merr., Eustachys distichophylla (Lag.) Nees, Gaudinia fragilis (L.) P. Beauv., Miscanthus sinensis Andersson, Neyraudia arundinacea (L.) Henrard, Phyllostachys aurea Rivière & C. Rivière, Phyllostachys bambusoides Siebold & Zuccarini, Rottboellia cochinchinensis (Lour.) Clayton, Schedonnardus paniculatus (Nutt.) Branner & Coville, Schizachyrium cirratum (Hack.) Wooton & Standl., Schizachyrium scoparium (Michx.) Nash, Themeda quadrivalvis (L.) Kuntze, Thysanolaena latifolia (Hornem.) Honda, Tribolium obliterum (Hemsl.) Renvoize, Zea mays L., Zizania palustris L. var. interior (Fassett) Dore, Zoysia japonica Steud. Paspalum pubiflorum E. Fourn., Paspalum quadrifarium Lam., are now reported for southern California (J Bot Res Inst Texas 4:761--770). See Glossary p. 30 for illustrations of general family characteristics.
eFlora Treatment Author: James P. Smith, Jr., except as noted
Scientific Editor: James P. Smith, Jr., J. Travis Columbus, Dieter H. Wilken.
Genus: BothriochloaView DescriptionDichotomous Key

Habit: Perennial herb, cespitose. Stem: erect; nodes generally short-hairy. Leaf: basal and cauline; ligule membranous; blade flat or folded. Inflorescence: panicle-like; branches +- digitate or racemes, long-soft-hairy; axis segments grooved, breaking with age. Spikelet: paired, dorsally compressed; sessile spikelet bisexual, glumes > florets, membranous, florets 2, lower vestigial, upper fertile, lemma translucent, tip awned; stalked spikelet staminate or sterile, pedicel hairy; spikelet pair and subtending axis segment breaking as a unit. Fruit: oblong to fusiform.
Species In Genus: +- 35 species: worldwide, warm temperate, tropics. Etymology: (Greek: pit, from pitted glumes of some species) Note: Cult for forage, revegetation. Reports of Bothriochloa exaristata (Nash) Henrard from Los Angeles Co. are unverified. Bothriochloa ischaemum var. songarica (Fisch. & C.A. Mey.) Celarier & J.R. Harlan, infraspecific taxa not recognized.
eFlora Treatment Author: Elizabeth M. Skendzic

Bothriochloa laguroides (DC.) Herter subsp. torreyana (Steud.) Allred & Gould
NATURALIZED
Stem: generally clumped, 4--13 dm. Leaf: generally basal; blade 5--21 cm. Inflorescence: 4--12 cm; branches > 10, 1--5 cm, silvery or tan; axis segment with a wide membranous groove. Spikelet: sessile > stalked, sessile 2.5--4.5 mm, lower glume without pit, lemma awn 7--16 mm; stalked 1.5--3.5 mm. Chromosomes: 2n=60.
Ecology: Rocky slopes, disturbed areas; Elevation: +- 900 m. Bioregional Distribution: c SNF (Mariposa Co.), ScV, SCoRO (Santa Barbara Co.); Distribution Outside California: native to central and southern United States, northern Mexico, South America. Flowering Time: Jul--Nov Note: Cult for forage.
Synonyms: Andropogon torreyanus Steud.
eFlora Treatment Author: Elizabeth M. Skendzic
Jepson Online Interchange

Previous taxon: Bothriochloa ischaemum
Next taxon: Bouteloua

Name Search
botanical illustration including Bothriochloa laguroides subsp. torreyana

Contact/Feedback

Citation for this treatment: Elizabeth M. Skendzic 2016. Bothriochloa laguroides subsp. torreyana, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=49437, accessed on May 30, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 30, 2016.


Bothriochloa laguroides subsp. torreyana
click for enlargement
© 2005 Steve Matson
Bothriochloa laguroides subsp. torreyana
click for enlargement
© 2005 Steve Matson
Bothriochloa laguroides subsp. torreyana
click for enlargement
© 2005 Steve Matson
Bothriochloa laguroides subsp. torreyana
click for enlargement
© 2005 Steve Matson
Bothriochloa laguroides subsp. torreyana
click for enlargement
© 2005 Steve Matson

More photos of Bothriochloa laguroides subsp. torreyana in CalPhotos


Geographic subdivisions for Bothriochloa laguroides subsp. torreyana:
c SNF (Mariposa Co.), ScV, SCoRO (Santa Barbara Co.);
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
READ ABOUT YELLOW FLAGS
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.
View all CCH records

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.