CHLOIUDE.E. 4, 1 



i. Peduncle smooth; floral glume S-awned. . . (j) 



j. Floral glume 2 mm. long 12 



j. Floral glume 1 mm. long 13 



B. AfheropogoH Mulil. us a genus. Spikes several or nu- 

 merous, nsualbf short, sfraiy/if, not pectinate, the few (J- 

 P2) spikelets often fascicled; the terminal empty fjlume 

 S-awned,or more or less reduced ami rudimentary, . . (k) 

 k. Spikes 30-GO, axis scabrous, each bearing 4-10 spike- 

 lets 14 



k. Spikes 5-11, axis glabrous, each bearing 3-G spike- 

 lets 15 



k. Spikes 4-6, axis silky villous, each bearing 7-10 



spikelets IG 



k. Spikes 3-5, each axis bearing 3-4 spikelets. ... IT 

 C Triathera Desv. as a genus. Spikes several, short and 

 narrow, the 1-3 slender spikelets closely appressed to the 

 rachis; terminal glume reduced to a triple awn or having 



a jwlea (m) 



m. Spikes 5-10, each bearing 2-3 spikelets 18 



m. Spikes 35-50, each bearing 1 spikelet 19, 30 



D. Polyodon 11. B. K. as a genus. Spikes few, short, of 

 few spikelets; floral glume 3-awncd, the 2-3 terminal 

 empty ones crowded together and each 3-,5-awned. ... 21 

 1. B. prostrata Lag. Varied. Cienc. 2:141 (1805). B. 

 pnsilla Vasey, liull. Torr.'Club, 11 :G (1884). Atheropogon hu- 

 viilis Spreng. Syst. l:2>j.: (1824). B. tenuis Griseb. (loett. Ablu 

 24: 303 (1879), as ticketed by Vasey. 



A loosely tufted slender annual. Culms many, geniculate, 10- 

 20 cm. high. Leaf-blades 1-4 mm. long, 1 mm. wide, flat or con- 

 volute. Spike solitary, much curved, })edicel velvety, bent, bract 

 about as long as i)edicel or shorter. Empty glumes lance-elliptical, 

 1-nerved; first 1.5-2 mm. long, second 3.5 mm. long; floral glume 

 firm, hairy on the outside, oval when closed, nerves obscure, 2.5-2.8 

 mm. long, lateral setjv about 1 mm. long, central one a little longer; 

 palea as long and as wide as its glume. (J rain compressed, 2 juin. 

 long, embryo on one thin edge. Kachilla above the floret about 1 



