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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

PLEUROPOGON SEMAPHORE GRASS

Susan J. Bainbridge


Annual, perennial herb. Stem: generally erect. Leaf: generally cauline; sheath margins fused > 1/2; ligule membranous; blade flat or folded, drooping. Inflorescence: raceme-like. Spikelet: bisexual; 1–8 cm; laterally compressed; glumes << lowest floret, translucent, lower 1-veined, upper 1–3-veined; breaking apart above glumes and beneath florets; florets 5–20; lemma 7–9-veined, veins prominent, not converging, extending to tip, awn (0)0.2–22 mm; palea ± = lemma, veins with appendages; anthers 3.
5 species: temperate North America, 1 sp. in eastern Asia. (Greek: side beard, from awn at palea base in some species) [But 2007 FNANM 24:103–109, Novon 4:16–17]
Unabridged references: [But 1994 Novon 4:16–17]

Key to Pleuropogon

1. Lowest floret lemma 8–12 mm; stem 7–16 dm; rhizome evident

2. Awn 0.2–4 mm; spikelets erect or ascending at maturity ..... P. hooverianus

2' Awn 5–22 mm; spikelets reflexed at maturity ..... P. refractus

1' Lowest floret lemma 4.5–7.5 mm; stem (0.4)1.5–9.5 dm; rhizome 0 ..... P. californicus

3. Annual; lemma awn generally present, (0)5–11 mm; palea appendages 0.5–2.5 mm ..... var. californicus

3' Perennial herb; lemma awn occasionally present, <= 1.5 mm; palea appendages 0.5–1 mm ..... var. davyi

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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].
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