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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.
Annual, ± hairy. Stem: erect, becoming prostrate. Leaf: basal and cauline; collar 0; sheath and blade continuous; basal leaves long, floating when young, becoming dry and non-functional as aerial parts grow; cauline leaf blade flat or inrolled when dry. Inflorescence: generally spike-like, exserted; spikelets 2-ranked; axis breaking above glumes and between florets with age. Spikelet: laterally compressed; florets 4–40; glumes irregularly 2–5-toothed; lemma strongly 5-toothed, each tooth 1/3–1/2+ lemma, prominent central vein flanked by 2 weaker veins; palea < lemma; anthers white or ± pink, exserted, filaments slender, ribbon-like; stigma 1/3–1/2 style, ± sparsely short-hairy.
5 species: California, northern Baja California. (C.R. Orcutt, California botanist, 1864–1929) [Reeder 2003 FNANM 25:290–292]
Unabridged references: [Reeder 1982 Amer J Bot 69:1082–1095]
1. Lemma teeth unequal, central tooth longest
2. Lemma 6–7 mm, teeth awned, awns > 1 mm; fruit ± 2.5 mm ..... O. viscida
2' Lemma <= 5 mm, teeth sharp-pointed or awned, awns < 0.5 mm; fruit <= 2 mm
3. Plant sparsely hairy; stem generally prostrate; spikelets well separated on axis below, crowded toward tip; South Coast, Western Transverse Ranges, San Gabriel Mountains, Peninsular Ranges ..... O. californica (2)
3' Plant conspicuously hairy, ± gray; stem erect or ± spreading; spikelets crowded, inflorescence ± head-like; c Sierra Nevada Foothills, San Joaquin Valley ..... O. inaequalis
1' Lemma teeth ± equal
4. Stem generally prostrate; fruit 1.5–2 mm ..... O. californica (2)
4' Stem erect, ascending, or decumbent; fruit 2–3 mm
5. Stem branching only at lower nodes; upper spikelets densely crowded, lower well separated; plant generally densely hairy ..... O. pilosa
5' Stem often branching from upper nodes; spikelets ± evenly spaced, not densely crowded; plant sparsely hairy ..... O. tenuis
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].
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