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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.

 

DIGITARIA CRAB GRASS
Annual, perennial herb. Stem: decumbent to erect. Leaf: basal and cauline; ligule membranous, ciliate or not; blade generally flat. Inflorescence: digitate to panicle-like; 1° branches ± spike-like, spreading to ascending; spikelets generally many per branch, 2 or 3 per node, short-stalked to subsessile, on one side of axis. Spikelet: dorsally compressed, falling as 1 unit; glumes unequal, upper glume <= spikelet, appressed-hairy, clearly 3–5-veined, veins minutely ridge-like; florets 2, lower floret sterile, lemma texture like upper glume, upper floret fertile, lemma ± thin, flexible, back facing away from inflorescence axis, margin flat, tip generally obtuse, awn 0; lower palea reduced or 0, the upper ± = lemma; anthers 3.
± 200 species: warm temperate, tropics, worldwide. (Latin: finger, from inflorescence branch arrangement) [Wipff 2003 FNANM 25:358–383] Digitaria bicornis (Lam.) Roem. & Schult., collected in 1926 in Monterey Co., and Digitaria eriantha Steud., collected in Imperial Co. in 1939, are presumed extirpated.
Unabridged references: [Webster 1987 Sida 12:209–222]

Key to Digitaria

1. Inflorescence panicle-like, branches appressed to ascending; spikelets conspicuously silky-hairy, hairs 1.5–5 mm ..... D. californica var. californica

1' Inflorescence branches ± digitate, spreading; spikelets glabrous or marginal hairs < 1 mm

2. Spikelets generally 3 per node on a branch; lower glume 0 or reduced to a membranous scale or rim ..... D. ischaemum

2' Spikelets generally 2 per node on a branch; lower glume 0.2–0.8 mm

3. Leaf blade generally scabrous on both surfaces, except few swollen-based hairs present at base of adaxial surface; sheath rounded ..... D. ciliaris var. ciliaris

3' Leaf blade generally with swollen-based hairs on both surfaces; sheath keeled ..... D. sanguinalis

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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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