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



sterile lemma about equal, 5-nerved, the marginal part densely 

 white-silky; fruit 3 mm long. % — Open sandy ground, Texas; 

 Arkansas (Benton County). 



2. Brachiaria extensa Chase. (Fig. 1192.) Annual; culms decum- 

 bent, rooting at the lower nodes; blades rather thick, 4 to 12 cm long, 

 6 to 12 mm wide; panicle short-exserted or included at base; racemes 

 2 to 6, distant, 3 to 8 cm long, ascending or 



spreading, the rachis 

 winged, 2 mm wide ; spike- 

 lets ovate, 4 to 4.5 mm 

 long, about 2 mm wide; 

 first glume scarcely one- 

 third the length of the 

 spikelet, blunt; second 

 glume and sterile lemma 

 equal, exceeding the fruit 



and forming a flat beak beyond it, 3- to 5-nerved, 



with transverse veinlets toward the summit; 



fruit 3 mm long, elliptic, papillose-roughened. 



O (B. platyphylla Nash.) — Low, sandy, open 



ground, Florida; southern Louisiana, Texas, and 



Oklahoma; Cuba (fig. 1193). 



3. Brachiaria plantaginea (Link) Hitchc. 



(Fig. 1194.) Resembling B. extensa, more widely creeping, usually 

 taller, blades commonly wider; rachis 1 to 1.5 mm wide, the mar- 

 gins infolded; first glume strongly clasping; transverse veinlets 

 wanting or obscure on the second glume and sterile lemma, these not 



Figure 1193.— Distribution of 

 Brachiaria extensa. 



Figure 1195 .—Brachiaria 

 erucaeformis. Panicle, X 1; 

 two views of spikelet, and 

 floret, X 10. (Cult.) 



Figure 1194. — Brachiaria plantaginea. Panicle, X 1; two views of spikelet, and floret, X 10. 



(Pringle 3904, Mex.) 



pointed beyond the fruit, o — Open, mostly moist, ground^ Met- 

 calf, Ga.; ballast, Philadelphia, Pa., and Camden, N.J.; Mexico to 

 Bolivia and Brazil. 



Brachiaria erucaeformis (J. E. Smith) Griseb. (Fig. 1195.) Spread- 

 ing annual with rather delicate erect racemes and pubescent spikelets 

 2.5 mm long, o — Has been cultivated in grass gardens, occasionally 

 escaped. Old World. 



