MANUAL OF THE GRASSES OF THE UNITED STATES 



579 



Figure 831. — Digitaria violascens. Panicle, X 1; two 

 views of spikelet, and floret, X 10. (Silveus 5394, 



Ala.) ||p 



or very obscurely pubescent, barely 

 exceeding the pale, slightly apiculate 

 fertile lemma. O — Sandy fields, 

 Florida, rare; Isla de Pinos, Cuba. 

 9. Digitaria filiformis (L.) Koel. 

 (Fig. 835, A.) Culms in small tufts, 

 slender, usually erect, 10 to 60 cm. 

 tall, rarely taller, those of a tuft very 

 unequal; lower sheaths pilose, the 

 upper mostly glabrous; blades erect, 

 usually 5 to 15 cm. long (longer in 

 more robust plants), 1 to 4 mm. 

 wide; racemes mostly 1 to 5, unequal, 

 erect or ascending, mostly less than 

 10 cm. long, somewhat distant, not 

 fascicled; spikelets 1.5 to 1.7 mm. 

 long; first glume wanting; second 

 glume and sterile lemma pubescent 

 with short capitellate hairs, some- 

 times nearly glabrous, the glume 

 shorter than the spikelet; fertile lem- 

 ma dark brown, slightly apiculate. 

 © — Sandy fields and sterile open 

 ground, New Hampshire to Iowa 

 and Oklahoma, south to Florida, 

 Texas, and Mexico. A form with 



Figure 832. — Digitaria serotina. Plant, X 1 ; two 

 views of spikelet, and floret, X 10. (Tracy 4653, 

 Miss.) 



