Digitaria cognata |
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Carolina cottontop, Carolina crabgrass, fall crabgrass, fall witchgrass |
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Habit | Plants perennial; cespitose, without rhizomes. |
Culms | 30-56 cm, erect; nodes glabrous. |
Leaves | mainly cauline; sheaths glabrous or sparsely to densely pubescent, sometimes with papillose-based hairs; ligules 0.2-1.5 mm, entire to lacerate; blades 2.4-12.6 cm long, 2-5.4 mm wide, glabrous or pubescent. |
Panicles | simple, 12.8-27.5 cm long, 16.5-44.5 cm wide, open; branches divergent; lower primary branches 10.5-24 cm, often with 1-several sterile branches near the base; pedicels divergent, spikelets solitary. |
Spikelets | 2.2-3.1 mm long, 0.7-1.1 mm wide, obovate or broadly elliptic. |
Lower glumes | 0.1-0.8 mm; upper glumes 1.8-2.8 mm, 3(5)-veined, glabrous or pubescent between the veins, hairs appearing as a narrow stripe; lower lemmas similar to the upper glumes in length, texture, and pubescence, 7-veined, veins unequally spaced, lateral veins closer together than the 3 central veins; upper lemmas 1.9-2.9 mm, glabrous, dark brown, narrowly acute; anthers 0.5-0.7 mm, yellow or purple. |
Caryopses | 1.3-1.6 mm. |
2n | = 36. |
Digitaria cognata |
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Distribution |
AL; AR; CT; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; PA; SC; TN; TX; VA; VT; WI; ON
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Discussion | Digitaria cognata grows in dry, sandy soils in the eastern portion of the Flora region from southern Ontario and Vermont through the United States and thence to southern Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 25, p. 362. |
Parent taxa | Poaceae > subfam. Panicoideae > tribe Paniceae > Digitaria |
Sibling taxa | |
Synonyms | Leptoloma cognatum |
Name authority | (Schult.) Pilg. |
Web links |