Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.

POACEAE

GRASS FAMILY

James P. Smith, Jr., except as specified

Annual to bamboo-like; roots generally fibrous
Stem generally round, hollow; nodes swollen, solid
Leaves alternate, 2-ranked, generally linear; 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; stamens generally 3; stigmas generally 2, generally plumose
Fruit: achene-like grain
Genera in family: 650–900 genera; ± 10,000 species: worldwide; greatest economic importance of any family (wheat, rice, maize, millet, sorghum, sugar cane, forage crops, ornamental, weeds; thatching, weaving, building materials)
Reference: [Hitchcock 1951 Manual grasses US, USDA Misc Publ 200; Clayton & Renvoise 1986 Kew Bull Add Series 13]
See Glossary p. 26 for illustrations of general family characteristics. Generally wind-pollinated.

DESCHAMPSIA

HAIRGRASS

Dieter H. Wilken and Elizabeth Painter

Annual, perennial herb
Stems erect, solitary to densely clumped
Leaves basal to cauline; ligule narrow, decurrent to sheath, glabrous to minutely hairy; blades flat to inrolled
Inflorescence panicle- to spike-like, open to narrow
Spikelet: glumes and lemmas shiny; glumes equal to ± subequal, > lower floret; axis prolonged beyond upper floret, bristly (sometimes with vestigial floret at tip); florets 1–3, bisexual, breaking above glumes and between florets; callus soft-hairy; lemmas rounded, 2–4-toothed at truncate tip, faintly 3–7-veined, awned at or below middle, awn straight to bent; palea ± = lemma
Species in genus: 30–40 species: temp Am, Eurasia, New Zealand, Antarctica
Etymology: (J. L-Deslongchamps, France, born 1774)

Native

D. atropurpurea (Wahlenb.) Scheele

MOUNTAIN HAIRGRASS

Perennial
Stems densely clumped, 1.5–6 dm
Leaves basal and cauline; basal tufted, generally glabrous; ligule 1–3 mm, obtuse to truncate, minutely ciliate at tip; blades 4–9 cm, 3–7 mm wide, flat
Inflorescence open; lower branches spreading to drooping
Spikelet purplish; glumes 4–6 mm, equal, elliptic, acute, lower 1-veined, upper 3-veined; florets generally 2; callus hairs ± 1/2 lemma length; lemmas 2.5–4 mm, generally 2-toothed at tip, faintly 3-veined, awned near middle, awn 2–3 mm, straight to slightly bent
Chromosomes: 2n=14
Ecology: UNCOMMON. Wet sites, meadows, streambanks, in coniferous forest
Elevation: 2000–2300 m.
Bioregional distribution: Klamath Ranges (Marble Mtns, Trinity Alps), High Cascade Range (Mt Shasta)
Distribution outside California: to British Columbia, e Canada, ne US, n Eurasia
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for DESCHAMPSIA%20atropurpurea being generated
 
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Deschampsia atropurpurea
Retrieve dichotomous key for Deschampsia
Overlay Consortium of California Herbaria specimen data by county on this map
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