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.



Annual, perennial herb, monoecious, aquatic
Stems erect, < 3 m, 1 cm wide
Leaf: ligule membranous, narrow; blade < 1.2 m, 2.5 cm wide
Inflorescence panicle-like; lower branches spreading to ascending, bearing staminate spikelets; upper branches ascending to erect, bearing pistillate spikelets
Staminate spikelet generally drooping; glumes vestigial, forming a collar-like ridge; floret 1; lemma linear, 5-veined, acuminate or awned; palea 3-veined; stamens 6
Pistillate spikelet generally ascending to erect, cylindric, angled, firm; glumes generally 0; floret 1, lemma 3-veined, long-tapered, awned
Fruit 1–2 cm, cylindric, purplish black
Species in genus: 3 species: North America, e Asia
Etymology: (Greek: ancient name for weed in grain fields)
Reference: [Dore 1969 Canada Dept Agric Res Publ 1393]


Z. palustris L. var. interior (Fassett) Dore


Stem puberulent at nodes
Leaf 15–45 cm, 6–40 mm wide
Inflorescence 2–5 dm
Staminate spikelet 6–8 mm
Pistillate spikelet 10–20 mm; awn 5–40 mm
Chromosomes: 2n=30
Ecology: Wet meadows, shallow ponds, lake margins
Elevation: < 1200 m.
Bioregional distribution: Inner North Coast Ranges, Sacramento Valley, Modoc Plateau
Distribution outside California: native to Canada, e US
Cult for food, waterfowl.

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bioregional map for ZIZANIA%20palustris%20var.%20interior 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 Zizania palustris var. interior
Retrieve dichotomous key for Zizania
Overlay Consortium of California Herbaria specimen data by county on this map
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