Digitaria violascens |
Digitaria leucocoma |
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violet crabgrass |
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Habit | Plants annual or of indefinite duration. | Plants perennial; cespitose. |
Culms | 15-60 cm, erect, usually not branching from the upper nodes; nodes 3-4. |
to 100 cm, erect, not branching at the lower nodes; nodes 1-2. |
Sheaths | glabrous or sparsely pubescent; ligules 0.6-2.5 mm; blades 1.5-9 cm long, 3-5 mm wide, glabrous, with papillose-based hairs basally. |
with appressed hairs, lower sheaths densely hairy, upper sheaths sparingly hairy near the base, otherwise glabrous; ligules 2-3 mm; blades 10-40 cm long, to 3 mm wide, usually flat, involute when dry. |
Panicles | with 2-7 spikelike primary branches in 1-2 verticils; primary branches 3-12 cm, erect to ascending, axes 0.6-1 mm wide, wing-margined, wings at least 1/2 as wide as the midribs, lower and middle portions of the branches bearing spikelets in groups of 3(4, 5); secondary branches rarely present; axillary inflorescences absent. |
with 2-4 spikelike branches on 4-6 cm rachises; primary branches 20-25 cm long, axes triquetrous, not winged; primary branches bearing spikelets in unequally pedicellate groups of 3(-5) on the basal 1/2; secondary branches rarely present, longer pedicels often adnate to the branch axes basally. |
Spikelets | 1.2-1.7 mm, homomorphic, narrowly elliptic. |
2.2-2.5 mm long, 0.8 mm wide, elliptic, acute. |
Lower glumes | absent or a veinless, membranous rim; upper glumes 1.2-1.4 mm, 1/2 as long as to almost equaling the upper lemmas, 3-veined, appressed-pubescent, hairs minutely verrucose; lower lemmas 1.2-1.7 mm, 5-7-veined, veins equally spaced, region between the 2 inner lateral veins and the margins appressed-pubescent, hairs 0.3-0.5 mm, smooth or minutely verrucose (use 50x magnification), verrucose hairs most abundant near the lemma bases; upper lemmas light brown when immature, dark brown at maturity; anthers 0.4-0.6 mm. |
absent; upper glumes 3-veined, margins and intercostal regions with long, glandular-tipped hairs; lower lemmas 7-veined, margins and the region between the 2 inner marginal veins with long glandular hairs; upper lemmas light to dark brown at maturity, striate, apiculate. |
2n | = 36. |
= unknown. |
Digitaria violascens |
Digitaria leucocoma |
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Distribution |
AL; AR; FL; GA; IN; KY; LA; MA; MS; NC; OK; SC; TN; TX; HI; PR
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Discussion | Digitaria violascens is a weedy species that is native to tropical regions of the Eastern Hemisphere. It is now established in the Flora region, primarily in the south-eastern United States, and in Mexico and Central America. It grows in disturbed sites. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Digitaria leucocoma is known only from high pine-lands near Lake Ella, Lake County, Florida. It has been treated in the past as a synonym of D. filiformis var. villosa. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 25, p. 372. | FNA vol. 25, p. 366. |
Parent taxa | Poaceae > subfam. Panicoideae > tribe Paniceae > Digitaria | Poaceae > subfam. Panicoideae > tribe Paniceae > Digitaria |
Sibling taxa | ||
Name authority | Link | (Nash) Urb. |
Web links |