Open Herbarium - Digitaria filiformis

Digitaria filiformis (L.) Koeler
Family: Poaceae Slender Crabgrass Linda Ann Vorobik and Hana Pazdírková, Illustrators	Flora of North America Resources J.K Wipff Plants annual, or short-lived perennials; cespitose, not rhizomatous. Culms (10)25-150 cm, erect or decumbent, branching, sometimes rooting at the lower nodes; nodes 3-6. Sheaths keeled, basal sheaths usually with papillose-based hairs, rarely glabrous; ligules 0.3-1.5 mm; blades 2-18 cm long, 1-6 mm wide, flat or involute, glabrous, scabrous, or pilose. Panicles with 2-7 spikelike primary branches, these digitate or the rachises to 1 cm; longest primary branches 3-25 cm long, 0.2-0.4 mm wide, axes triquetrous, not wing-margined, with spikelets in groups of 2-5 on the lower and middle portions. Spikelets 1.3-2.8 mm. Lower glumes absent or to 0.1 mm; upper glumes 1-2 mm long, from 3/4 to almost as long as the spikelets, almost glabrous or sparsely to densely pubescent with clavate to capitate hairs (use 20× magnification), glume apices rounded; lower lemmas equaling the spikelets, glabrous or glandular-pubescent, 5-7-veined, veins unequally spaced, outer 3 veins on each side closer to each other than the midvein is to the inner lateral veins; upper lemmas 1.3-2 mm, apiculate, dark brown at maturity; anthers 0.3-0.6 mm. 2n = 36, 54. Digitaria filiformis grows throughout the warmer parts of the eastern United States. Digitaria filiformis var. filiformis, the most widespread of its varieties, extending into Mexico.
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