Digitaria horizontalis Willd.
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Authority
Acevedo-Rodríguez, Pedro & collaborators. 1996. Flora of St. John, U.S. Virgin Islands. Mem. New York Bot. Gard. 78: 1-581.
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Family
Poaceae
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Scientific Name
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Description
Species Description - Annual herb, lacking stolons; flowering culms 2-9 dm tall, erect or decumbent at the base, sparingly branched. Leaf sheaths hairy; ligule 0.5-1.5 mm long; blades linear, flat, 2.5-12 x 0.3- 0.9 cm, smooth, hairy on the upper surface. Inflorescence ovate; main axis 0.5-5.7 cm long; primary branches 6-15 cm long, distinctly winged. Spikelets paired, lanceolate, 2-2.6 x 0.47- 0.6 mm; lower glume 0.1-0.25 mm long, 1-nerved; upper glume 0.8-2 mm long, 1-3-nerved; lemma of lower floret lanceolate to ovate, 5-7-nerved, muticous, the palea absent; lemma of upper floret lanceolate, cartilaginous, striate, yellow, 1.8-2.5 mm long, muticous.
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Discussion
Milium digitatum Sw., Prodr. 24. 1788, non Digitaria digitata Biise, 1854. Syntherisma digitata (Sw.) Hitchc, Contr. U.S. Natl. Herb. 12: 142. 1908. Digitaria setosa Desv. ex Ham., Prodr. PI. Ind. Occ. 6. 1825
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Distribution
Occasional weed of open disturbed places. Bordeaux (W189), Lameshur (A3211). Also on St. Thomas; throughout the tropics and subtropics worldwide.
Saint John Virgin Islands of the United States South America|