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.


Kelly W. Allred

Perennial; rhizomes thick
Stem erect, cane-like
Leaves cauline; sheaths > internodes, glabrous; ligule thinly membranous, fringed; blade flat or folded, glabrous, margin scabrous
Inflorescence panicle-like, dense, silvery to purplish
Spikelet laterally compressed; glumes > florets, 3–5-veined; axis glabrous; florets 4–5, breaking above glumes and between florets; lemmas 3–7-veined, hairy, awn ± 0; palea < lemma
Species in genus: 3 species: warm temp, tropical
Etymology: (Latin: a reed grass)


A. donax L.


Stem < 8 m; nodes glabrous; internodes < 4 cm thick
Leaf: blade < 1 m, 2–6 cm wide
Inflorescence 3–6 dm, plume-like; branches ascending
Spikelets 10–14 mm; glumes 10–13 mm, thin, brownish or purplish; lemmas 8–12 mm, tip 2-toothed, hairs < 8 mm, silky; palea 3–5 mm, hairy at base; anthers 2.5–3 mm
Chromosomes: 2n=110
Ecology: Moist places, seeps, ditchbanks
Elevation: < 500 m.
Bioregional distribution: c Sierra Nevada Foothills, Central Coast, South Coast, San Gabriel Mountains, Desert
Distribution outside California: native to Europe
Flowering time: Mar–Sep

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bioregional map for ARUNDO%20donax 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 Arundo donax
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Overlay Consortium of California Herbaria specimen data by county on this map
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