Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



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.



Mary E. Barkworth

Perennial, tufted
Stem generally erect
Leaf: ligule membranous, sometimes long-ciliate, blade generally flat
Inflorescence panicle-like, generally narrow; branches generally ascending
Spikelet: glumes > floret (except awn), tapered below midpoint; axis breaking above glumes; floret 1, generally cylindric; callus blunt or sharp, hairs stiff; lemma stiffly membranous to hard, evenly hairy or glabrous above, awned from tip; awn > 10 mm, persistent, with 1–2 bends, or < 10 mm, readily deciduous, ± straight; palea < lemma, hairy, veined
Species in genus: ± 75 species: temp worldwide
Etymology: (Greek: awned scale, from lemma)
Segregated mostly from Stipa ; see also Hesperostipa, Nassella.


A. stillmanii (Bol.) Barkworth

Stem 6–15 dm
Leaf: basal sheath smooth, hairy above, at collar; blade 4–6 mm wide, folded or rolled
Inflorescence 10–20 cm
Spikelet: glumes 14–22 mm, ± equal; floret 8–12 mm; callus 1–1.5 mm, blunt; lemma short-hairy, tip 2-toothed, teeth 1–2 mm, awn-like, awn 19–32 mm, bent once, sometimes twice; palea ± = lemma
Ecology: Uncommon. Rocky slopes, coniferous forest
Elevation: 900–1550 m.
Bioregional distribution: n High Sierra Nevada
Synonyms: Stipa s. Bol
Horticultural information: DRN, IRR, part SHD: 1, 2, 6, 7, 15, 16; DFCLT.

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