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Hordeum
Family: Poaceae
Hordeum image
ASU Fruit & Seed Collection
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Roland von Bothmer, Claus Baden, Niels H. Jacobsen. Flora of North America
Plants summer or winter annuals or perennials; cespitose, sometimes shortly rhizomatous. Culms to 135(150) cm, erect, geniculate, or decumbent; nodes glabrous or pubescent. Sheaths open, pubescent or glabrous; auricles present or absent; ligules hyaline, truncate, erose; blades flat to more or less involute, more or less pubescent on both sides. Inflorescences usually spikelike racemes, sometimes spikes, all customarily called spikes, with 3 spikelets at each node, central spikelets usually sessile, sometimes pedicellate, pedicels to 2 mm, lateral spikelets usually pedicellate, pedicels curved or straight, sometimes all 3 spikelets sessile in cultivated plants; disarticulation usually in the rachises, the spikelets falling in triplets, cultivated forms generally not disarticulating. Spikelets with 1 floret; glumes awnlike, usually exceeding the floret. Lateral spikelets usually sterile or staminate, often bisexual in cultivated forms; florets pedicellate, usually reduced; lemmas awned or unawned. Central spikelets bisexual; florets sessile; rachillas prolonged beyond the floret; lemmas ovate, glabrous to pubescent, 5-veined, usually awned, rarely unawned; paleas almost equal to the lemmas, narrowly ovate, keeled; lodicules 2, broadly lanceolate, margins ciliate; anthers 3, usually yellowish. Caryopses usually tightly enclosed in the lemma and palea at maturity. 2n = 14, 28, 42. Name from the old Latin name for barley.
Vascular plants of NE US and adjacent Canada
Spikelets 1(2)-fld, not disarticulating, borne in triads on opposite sides of the rachis, the lateral spikelets often pedicellate and sterile, the central one sessile and fertile; glumes elongate, awned or awn-like, setaceous throughout or widened at base, the 6 in each triad of spikelets forming a false invol to the florets; lemma of the lateral spikelets often reduced or abortive, that of the central spikelet indurate, obscurely veined, its rounded back turned away from the rachis, usually long-awned; rachilla prolonged behind the palea as a short bristle; grasses with mostly flat lvs, scarious, truncate ligules, and dense, bristly spikes which, except in H. vulgare, disarticulate at each joint. (Critesion) 35, widespread

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Species within checklist: Arizona
Hordeum adscendens
Image of Hordeum adscendens
Hordeum arizonicum
Image of Hordeum arizonicum
Hordeum brachyantherum
Image of Hordeum brachyantherum
Hordeum jubatum
Image of Hordeum jubatum
Hordeum marinum
Image of Hordeum marinum
Hordeum murinum
Image of Hordeum murinum
Hordeum pusillum
Image of Hordeum pusillum
Hordeum vulgare
Image of Hordeum vulgare
The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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