582 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



01 — Sandy oak woods or sandy 

 prairie, southern Texas. 



14. Digitaria runyoni Hitchc. (Fig. 

 840.) Perennial; culms ascending, 40 

 to 70 cm. tall, the base often long- 

 creeping and rooting, many-noded; 

 sheaths densely villous or the upper 

 glabrate; blades flat, the lower densely 

 velvety-villous, the upper sparingly 

 pilose or glabrous, mostly less than 10 

 cm. long, 3 to 6 mm. wide; racemes 5 

 to 10, on an axis 1 to 4 cm. long, 

 mostly suberect, 7 to 12 cm. long, 

 pale, sometimes naked at base, the 

 rachis flat-triangular; spikelets nar- 

 rowly lanceolate, acute, 2.8 to 3.5 

 mm. long; first glume minute or ob- 

 solete; second glume and sterile 

 lemma equal, sparsely to densely vil- 

 lous on the internerves, the lemma 



Figure 837. — Digitaria dolichophylla. Plant, X 1; 

 spikelet and floret, X 10. (Tracy 9058, Fla.) 



solete, the second one-fourth to half 

 as long as the dark-brown fertile 

 lemma; sterile lemma scarcely equal- 

 ing the fruit. % — Sandy soil, high 

 pineland, peninsular Florida, rare. A 

 tall plant from Grasmere with 3 to 5 

 racemes, the spikelets having second 

 glumes about two-thirds as long as 

 the fertile lemma, has been differen- 

 tiated as D. bakeri (Nash) Fernald. 



13. Digitaria texana Hitchc. (Fig. 

 839.) Perennial, erect or somewhat 

 decumbent and branching at base; 

 culms 30 to 60 cm. tall; lower sheaths, 

 rarely all the sheaths, villous or 

 velvety-pubescent, the uppermost 

 glabrous; ligule prominent; blades 

 flat, the lower villous, the upper gla- 

 brate, 10 to 15 cm. long, 3 to 5 mm. 

 wide; racemes mostly 5 to 10, slender, 

 pale, ascending or erect, 5 to 12 cm. 

 long, the axis 1 to 4 cm. long; rachis 

 angled, the scabrous margins much 

 narrower than the whitish center; 

 spikelets mostly rather distant, 2 to 

 2.5 mm. long, from short-villous to 

 nearly glabrous, the silky hairs not at 

 all capitellate; first glume obsolete; 

 second glume and sterile lemma as 

 long as the pale acute fertile lemma. 



Figure 838. — Digitaria gracillima. Plant, X 1; two 

 views of spikelet, and floret, X 10. (Type.) 



glabrous on the middle internerves; 

 fertile lemma acuminate, usually a 

 little shorter than the spikelet, pale 

 at maturity. 2[ — Sand dunes and 

 sand}' prairies along the coast, 

 southern Texas. 



15. Digitaria pauciflora Hitchc. 

 (Fig. 841.) Perennial; culms erect or 

 somewhat decumbent at base, 0.5 to 



