580 



MISC. PUBLICATION 200, U. S. DEPT. OF AGPJCULTURE 



Figtjke 833. — Digitaria longiflora. Plant, X Y>. Stolon and panicle, X 1; spikelet and floret, X 10. (Silveus 



4405, Fla.) 



glabrous spikelets from Manchester, 

 N. H., has been described as D. 

 laeuiglumis Fernald (835, B.). 



10. Digitaria villosa (Walt.) Pers. 

 (Fig. 836.) Perennial at least in the 

 Southern States, in large tufts, pur- 

 plish at base; culms 0.75 to 1.5 m. 

 tall, rarely branching; sheaths, at 

 least the lower, grayish villous, some- 

 times sparsely so; blades elongate, 

 3 to 6 mm. wide, often flexuous, from 

 softly pilose to nearly glabrous; 

 racemes 2 to 7, narrowly ascending, 

 rarely somewhat spreading, very slen- 

 der, usually 15 to 25 cm. long, rather 

 distant, often naked at base, some- 

 times interrupted; spikelets 2 to 2.5 

 mm. long, usually densely pubescent 

 with soft capitellate hairs, the hairs 

 longer than in D. filifarmis, and some- 



times only obscurely capitellate, the 

 spikelets otherwise very like those of 

 D. filifarmis. % — Sandy fields and 

 woods, Maryland to Missouri, south 

 to Florida and Texas; Cuba, Mexico. 

 This species and D. filifarmis seem 

 to intergrade to some extent. Plants 

 from peninsular Florida with less 

 strongly pubescent sheaths, 2 to 4 

 elongate racemes, and spikelets with 

 longer hairs have been distinguished 

 as D. leucocoma (Nash) Urban. 



11. Digitaria dolichophylla Henr. 

 (Fig. 837.) Slender wiry perennial. 

 50 to 115 cm. tall; blades elongate, 

 folded or involute, flexuous, about 

 1 mm. wide; racemes mostly 1 to 

 3, erect, 5 to 20 cm. long, usually 

 10 to 20 cm., very slender, loosely 

 flowered; spikelets about 1.5 mm. 



