MANUAL OF THE GRASSES OF THE UNITED STATES 



583 



Figure 839. 



-Digitaria texana. Plant, X 1 ; spikelet and floret, 

 X 10. (Type.) 



Figure 840. — Digitaria runyoni. Plant, X 

 1 ; spikelet and floret, X 10. (Type.) 



1 m. tall, very slender, sparingly 

 branching; foliage grayish-villous, the 

 blades 6 to 12 cm. long, about 2 mm. 

 wide; racemes 2 or 3, ascending or 

 erect, 5 to 11 cm. long, the filiform 

 rachis naked for 1 to 1.5 cm. at base, 

 or with distant abortive spikelets; 

 spikelets rather distant, elliptic, about 

 3.2 mm. long, glabrous; first glume 

 minute with a hyaline erose margin; 

 second glume and sterile lemma finely 

 nerved, as long as the grayish fertile 

 lemma. % — Pinelands, southern 

 Florida. 



16. Digitaria subcalva Hit chc. (Fig. 

 842.) Perennial; culms tufted, slender, 

 ascending from a curved base, 40 to 

 100 cm. tall; sheaths papillose-pilose; 



blades flat, scabrous, the lower pilose, 

 3 to 15 cm. long, 1 to 3 mm. wide; 

 racemes 2 to 4, narrowly ascending, 

 5 to 12 cm. long, approximate, the 

 rachis slender, triangular, mostly 

 naked at base for 1 to 1.5 cm.; spike- 

 lets 2.5 to 2.8 mm. long, acute; first 

 glume obsolete; second glume and 

 sterile lemma slightly shorter than 

 the acute pale or drab fruit, the inter- 

 nerves from obscurely to distinctly 

 appressed silky-pubescent. % — 

 Known only from Plant City, Fla. 



17. Digitaria albicoma Swallen. 

 (Fig. 843.) Culms 65 to 75 cm. tall, 

 erect, simple or branched at the base; 

 lower sheaths densely villous, the 

 upper elongate, glabrous or papillose- 



