Jepson Flora Project: Jepson Interchange    

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

AGROSTIS

BENT

M. J. Harvey

Annual or perennial herb, generally tufted, sometimes from rhizomes or stolons
Stems generally erect
Leaf: sheath generally smooth, glabrous; ligule membranous; blade flat to rolled
Inflorescence panicle-like, densely cylindric to openly ovate
Spikelet: glumes generally subequal, back generally glabrous, vein generally finely scabrous, 1-veined, generally acute; floret 1, < glumes, generally breaking above glumes; callus glabrous to densely hairy; lemma generally 5-veined, veins not converging, sometimes extended as short teeth, awned from back or not; palea 0 to ± = lemma, translucent; anthers generally 3
Species in genus: ± 200 species: especially temp Am, Eurasia
Etymology: (Greek: pasture)
Reference: [Carlbom 1967 PhD OR State Univ]
Some cultivated in pastures, lawns.

Introduced

A. gigantea Roth

Perennial 20–100 cm; rhizomes < 25 cm, ± scaly
Leaves: ligule 2–6 mm; lower blades 4–10 cm, 3–8 mm wide, flat
Inflorescence 8–25 cm, widely ovate in outline, open; 1° branches mostly spreading, lower 4–7 cm, axes thread-like
Spikelet: glumes 2–3 mm; callus hairs 0 or minute; lemma 1.5–2 mm, awn 0; palea 0.7–1.4 mm; anthers 1–1.4 mm
Chromosomes: 2n=42
Ecology: Roadsides, fields, ditches, disturbed areas
Elevation: < 2000 m.
Bioregional distribution: California Floristic Province
Distribution outside California: e N.America; native to Europe
Synonyms: A. alba L. misapplied, in part
Difficult to separate from A. stolonifera.

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bioregional map for AGROSTIS%20gigantea being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Agrostis gigantea
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