Digitaria ischaemum (Schreb.) Smooth Crabgrass Habit: Annual. Culms: 15-50 cm. tall, erect or soon prostrate and rooting at the lower nodes, resembling D. sanguinalis. Blades: 1.5-13 cm. long, 2.5-6 mm., 4-10 cm. long, divergent in whorls, or approximate at the summit of the stems, the rachis with thin wings wider than the midrib. Sheaths: Glabrous. Ligule: Membranous. Inflorescence: Spikelike racemes 2-6, 4-10 cm. long, divergent in whorls, or approximate at the summit of the stems, the rachis with thin wings wider than the midrib. Spikelets: About 2 mm. long, 1-flowered, lanceolate-elliptic, in 2's, sessile or short-pediceled. Glumes: First glume rudimentary or so thin as to be apparently wanting, the second glume and sterile lemma equal, densely short-villous between the nerves. Lemmas: Sterile lemma 5-nerved; fertile lemma dark brown, pubescent with capitellate hairs, with a hyaline margin not inrolled. Palea: Enclosed in the lemma. Fruit: Grain. Habitat: Waste places, fields and roadsides. July-September. Kansas Range: East third. Remarks: Often a troublesome weed.