ANDROPOGONEiE. 



33 



sessile spikelet 4, awnless, warty, hard, empty, the second smaller 

 coucave, thiu and firm, third and fourth small, thin and hyaline, 

 awnless; palea minute or 0. Stamens 

 3. Styles distinct. Grain enclosed by 

 the round glume, but not adherent. 



Species 11, widely spread over the 

 warmer regions of the New and the Old 

 World. 



1. H. granulans (L.) Kuntze, Rev. 

 Gen. PI. 776 (1891). Cenchrus grami- 

 laris L. Mant. 2 : App. 575 (1771). 

 Manisuris gramilaris Sw. 



A slender leafy branching annual, 

 70-90 cm. high. Sheaths loose, com- 

 pressed, hispid ; ligule very short ; blades 

 short flat, ciliate cordate, 0-20 cm. long, 

 8-12 mm. wide, clothed with spreading 

 hairs each springing from a tubercle, the 

 floral leaves generally exceeding the en- 

 closed sheathing bracts and spikes and 

 narrower sheathing bracts, the whole in- 

 florescence forming an irregular leafy 

 panicle. Spikes 1.5-2.5 cm. long. 

 Sessile spikelets 1.8-2.5 mm. long, 

 1.3 mm. diam. on an obconical callus, 



0.5-0.8 mm. long, outer glume 11- Fig. 10.— Hackelochloa granu- 



. laris. A, spike ; a, h, ? 



nerved, second oval, 1-nerved; j'jef??'c(?/- spikelet, x 4 ; c, <? spikelet, 



late spikelets 2 mm. or more long, first ^ ^- (Scribner.) 



glume flat-oval, 5-7-9-nerved, with a keel near each margin, 



second concave, 7-nerved, the keel winged. 



Ga., Curtiss 3625; Arizona, Pr ingle, Lemmon 315; Mexico, 

 Palmer, Pringle 366; both for U. S. Dept. Agric. 



In Palmer's specimen there is a thin glume, nearly as long as 

 the outer glume; it is hyaline, broad oval, 2-nerved. A fourth 

 one is a little shorter, hyaline, nerveless. Stamens 3. In Pringle's 



