Directory       News       Site Map       Home
         
    Jepson eFlora: Taxon page
Key to families | Table of families and genera

Previous taxon Indexes to all 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 |
Previous taxon

POACEAE (Gramineae) GRASS FAMILY

James P. Smith, Jr., except as noted

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.
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). [Barkworth et al. 2003 FNANM:25; Barkworth et al. 2007 FNANM:24] 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. —Scientific Editors: James P. Smith, Jr., J. Travis Columbus, Dieter H. Wilken.
Unabridged references: [Hitchcock 1951 Manual grasses US, USDA Misc Publ 200; Clayton & Renvoise 1986 Kew Bull Add Series 13]

Key to Poaceae

DESCHAMPSIA HAIR GRASS

Robert E. Preston & Dieter H. Wilken

Annual, perennial herb. Stem: erect, 1 to densely clumped. Leaf: generally basal, tufted; ligule narrow, decurrent to sheath, glabrous to minutely hairy; blade flat to inrolled. Inflorescence: panicle- to spike-like, open to narrow. Spikelet: glumes, lemmas shiny; glumes ± equal, > lower floret; axis prolonged >= 0.75 mm beyond upper floret, conspicuously bristly (sometimes with vestigial floret at tip); florets 1–3, bisexual, breaking above glumes and between florets; callus soft-hairy; lemma rounded, 2–4-toothed at truncate tip, faintly 3–7-veined, awned at or below middle, awn straight to bent; palea ± = lemma.
30–40 species: temperate America, Eurasia, New Zealand, Antarctica. (Louis Auguste Deschamps, French naturalist, 1765–1842) Deschampsia atropurpurea is now treated as Vahlodea atropurpurea.
Unabridged references: [Chiapella 2007 Taxon 56:55–64; Kawano 1963 Canad J Bot 41:719–742]

Key to Deschampsia

D. cespitosa (L.) P. Beauv. TUFTED HAIR GRASS
NATIVE
Perennial herb, densely to loosely clumped. Stem: 2–10 dm. Leaf: glabrous to scabrous; ligule 3–8 mm, acute to obtuse, entire to toothed at tip; blade generally 8–20 cm, 1–4 mm wide, flat to inrolled. Inflorescence: narrow to open; lower branches erect to drooping. Spikelet: glumes, lemma tips ± purple; glumes ± equal, lanceolate, acute, lower 1-veined, upper 3-veined; florets generally 2; callus hairs generally < 1/3 lemma; lemma generally 4-toothed at tip, faintly 5-veined, awned at or below middle, awn straight to slightly bent.
2n=26–28. Subspecies intergrade, need study. [Online Interchange]

D. cespitosa subsp. cespitosa
NATIVE
Densely clumped, not glaucous. Inflorescence: open (compact in some high elevation plants); lower branches spreading to drooping. Spikelet: 1 to clustered on exposed branchlets; glumes 2–6 mm; lemma 2–4 mm, awn 1–8 mm, generally attached near base of lemma, generally not exceeding glumes (exceeding glumes in some high elevation plants).
Meadows, streambanks, coastal marshes, forest, alpine; < 3820 m. Northwestern California, Cascade Range, Sierra Nevada, Central Coast, San Francisco Bay Area, Transverse Ranges, Warner Mountains, n East of Sierra Nevada, White and Inyo Mountains; Alaska, Canada, eastern United States; Eurasia. Jul–Aug [Online Interchange]

Previous taxon: Deschampsia cespitosa subsp. beringensis
Next taxon: Deschampsia cespitosa subsp. holciformis

Contact/Feedback

Name search

Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 26 2014
Citation for this treatment: [Author of taxon treatment] 2013. Deschampsia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=50130, accessed on Jul 26 2014

Copyright © 2014 Regents of the University of California
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.


Bioregions in which Deschampsia cespitosa subsp. cespitosa occurs Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
READ ABOUT YELLOW FLAGS
map of distribution 1
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.