Digitaria simpsonii
Plants of indefinite duration; not rhizomatous. Culms 80-120 cm, erect or decumbent and rooting at the lower nodes, not branching at the aerial nodes. Sheaths hirsute, with papillose-based hairs, those of the innovation sheaths compressed-keeled; ligules 1-2 mm; blades 7-30 cm long, 3-5 mm wide, flat, pilose above and below. Panicles with 6-8 spikelike primary branches on 4-6 cm rachises; primary branches 8-13 cm, axes triquetrous, narrowly winged, wings less than 1/2 as wide as the midribs, lower and middle portions of the branches bearing spikelets in appressed, unequally pedicellate pairs; secondary branches rarely present; axillary inflorescences not present; pedicels not adnate to the branch axes. Spikelets about 3 mm, elliptic lanceolate, acute. Lower glumes absent or minute and hyaline; upper glumes 7-9-veined, glabrous or obscurely pubescent; lower lemmas 7-9-veined, glabrous or obscurely pubescent; upper lemmas elliptic, yellow or gray, becoming purple at maturity, slightly apiculate. 2n = unknown.
Discussion
Digitaria simpsonii is a rare species, known only from sandy fields in Florida.
Selected References
None.