Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
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.



John R. Baird and John W. Thieret

Perennial, generally with rhizomes
Stem erect, unbranched
Leaves basal and cauline; sheath open, > internodes, glabrous, margin of sheath opening sometimes with long, shaggy hairs; ligule a fringe of hairs, 0.5–2 mm; blade flat to inrolled, long tapered, upper surface ridged
Inflorescence panicle-like; each spike-like branch with 2 rows of overlapping spikelets on lower side of axis
Spikelet laterally compressed, sessile, breaking below glumes, falling as 1 unit; glumes firmly membranous, obtuse to acuminate or with a small, sharp point, unequal, upper 1–3(5)-veined, generally > floret, lower 1-veined, < floret; floret 1; lemma 1(3)-veined, acute, awned or not, firmly membranous; palea ± = lemma, 2-veined
Species in genus: 15 species: Am, Eur, Africa
Etymology: (Greek: a cord)
Reference: [Spicher & Josselyn 1985 Madroño 32:158–167]


S. patens (Aiton) Muhl.


Rhizome 2–4 mm wide or 0
Stem slender, solitary or in small clumps, 3–12 dm, 1.5–4 mm wide at base, internodes firm
Leaf: blade 10–50 cm, 1–4 mm wide at base, generally inrolled when fresh, ridges on upper surface ± 3 per mm
Inflorescence 5–22 cm, 10–90 mm wide, open; branches 2–13, often separated at least below, ascending to spreading (to ± 60°), 1–8 cm, 2–4 mm wide
Spikelet 7–12 mm; glume and lemma keels scabrous at least near tip; lower glume 2–8 mm; upper glume 6–12 mm; lemma 5–8 mm
Chromosomes: 2n=28
Ecology: Coastal salt marshes
Elevation: < 10 m.
Bioregional distribution: Central Coast
Distribution outside California: native to se US

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bioregional map for SPARTINA%20patens 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 Spartina patens
Retrieve dichotomous key for Spartina
Overlay Consortium of California Herbaria specimen data by county on this map
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