Jepson eFlora
Key to families | Table of families and genera

Key to Hordeum

View taxon page for Hordeum

1. Auricles of upper leaves well developed, 1–4(8) mm

2. Inflorescence axis generally remaining intact at maturity; lateral spikelets sessile (stalked in sterile plants); glume margins not ciliate ..... [H. vulgare]

2' Inflorescence axis breaking apart at maturity; lateral spikelets stalked; glume margins ciliate ..... H. murinum

3. Central spikelet stalk 0–0.5 mm; lemma of central floret generally = lemma of lateral floret; palea of lateral floret scabrous to glabrous ..... subsp. murinum

3' Central spikelet stalk 1–2 mm; lemma of central floret < lemma of lateral floret; palea of lateral floret hairy or scabrous on lower 1/2

4. Lemma of central floret <= those of lateral florets; palea of lateral florets long-hairy on lower 1/2; anthers of central florets < 1/2 those of lateral florets ..... subsp. glaucum

4' Lemma of central floret << those of lateral florets; palea of lateral florets scabrous on lower 1/2; anthers of central spikelets = those of lateral florets ..... subsp. leporinum

1' Auricles of upper leaves generally 0 (vestigial rudiments occasionally present on lower leaves)

5. Glumes strongly divergent at maturity

6. Glumes of central spikelet 11–28 mm, flat near base ..... H. arizonicum

6' Glumes of central spikelet (15)35–85 mm, bristle-like throughout ..... H. jubatum subsp. jubatum

5' Glumes generally straight with age (slightly spreading in some Hordeum brachyantherum)

7. Perennial herb; inflorescence fully exserted at maturity ..... H. brachyantherum

8. Leaf sheath generally glabrous, blade glabrous or sparsely short-hairy; stem generally robust ..... subsp. brachyantherum

8' Leaf sheath generally densely hairy, blade generally short- and long-hairy; stem slender ..... subsp. californicum

7' Annual; inflorescence generally ± enclosed in upper sheath at maturity (except Hordeum marinum subsp. gussoneanum)

9. Awn of lateral spikelet lemma 3–8 mm ..... H. marinum subsp. gussoneanum

9' Awn of lateral spikelet lemma 0–1.2 mm

10. Nodes glabrous; glumes of central spikelet rounded to slightly flattened near base ..... H. depressum

10' Nodes generally pubescent; glumes of central spikelet distinctly flattened at base ..... H. intercedens

Contact/Feedback

Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.