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 Barkworth

Species in genus: 1 sp
Etymology: (Latin & Greek: pasture wheat)
Reference: [Barkworth & Dewey 1985 Amer J Bot 72:767–776]


P. smithii (Rydb.) Á. Löve

Perennial, from rhizomes
Stem erect, (2)4–9 dm, glaucous
Leaves basal and cauline, glaucous; ligule membranous; sheath appendages 1–2 mm, clasping; blade flat, rolled when dry
Inflorescence 4–15 cm, spike-like; spikelets 2-ranked, overlapping, 1(2) per node
Spikelet: glumes subequal, < or = lower floret, glabrous to rough, tapered from middle to acute tip, 3-veined in lower half, midvein curving slightly to side; axis breaking above glumes and between florets; florets 4–11; lemma 8–14 mm, glabrous to hairy, awn < 5(15) mm; anthers 2–4.5 mm
Chromosomes: 2n=56
Ecology: Uncommon. Dry, alkaline soils, flats
Elevation: 1500–2000 m.
Bioregional distribution: Great Basin Floristic Province, Desert Mountains (New York Mtns)
Distribution outside California: to s Canada, Great Plains
Flowering time: Jun–Aug
Synonyms: Agropyron s. Rydb
Polyploid derived from hybrid between Elymus and Leymus.

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bioregional map for PASCOPYRUM%20smithii 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 Pascopyrum smithii
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