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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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, cespitose
Stem prostrate or erect
Leaves generally basal; blade generally inrolled, with translucent line on both sides of midvein, generally wavy toward tip
Inflorescence panicle-like; spikelets generally only on distal half of branches
Spikelet: glumes ± equal, generally > floret; axis breaking above glumes; floret 1, generally ovoid; lemma finely striate, hairs brown, tubercled near neck-like tip, margins inrolled, fitting into grooved palea, awned; palea slightly > lemma, grooved longitudinally
Species in genus: ± 35 species: Am
Etymology: (Greek: falling hair)
Reference: [Parodi 1944 Revista Mus La Plata, Secc Bot 6:213–310]


P. setosum (Trin.) Arechav.

Stem 2–4 dm
Leaf: blade ± 0.5 mm diam, thread-like
Inflorescence 5–10 cm
Spikelet: glumes ± equal, 7–8 mm; floret 3–3.5 mm, ovoid; callus blunt; lemma tip 0.5–1 mm wide, awn < 15 mm, bent, deciduous
Ecology: Disturbed sites
Elevation: < 200 m.
Bioregional distribution: n San Francisco Bay Area (Marin Co.)
Distribution outside California: native to Chile

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bioregional map for PIPTOCHAETIUM%20setosum 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 Piptochaetium setosum
Retrieve dichotomous key for Piptochaetium
Overlay Consortium of California Herbaria specimen data by county on this map
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