98 *THE TRUE GRASSES. 



*** Empty glumes awnless or only the 

 second very short-awned. 

 t Flowering glumes awned from the 

 very point or not at all. 



127. G-arnotia. 

 ft Flowering glume aAvned below the 

 toothed point. . . 128. Thurberia. 

 [Oinna, No. 131, may be looked for here.] 

 2°. Empty glumes persistent upon the unartieu- 

 late pedicel of the spikelet. 

 * Palea one-nerved, with one keel ; sta- 

 men one 131. Cinna. 



** Palea two-nerved, rarely wanting ; sta- 

 mens three, 

 t Empty glumes covered with long 

 plumose hairs. . . 144. Lagurus. 

 ft Empty glumes saccate at the base, 

 man}' times longer than the flowering 

 glumes. . . . 134. Gastridium. 

 ttt Empty glumes neither plumose- 

 hairy, nor saccate at the base. 

 O Flowering glume four-cleft, each 

 division terminated by a fine 

 straight awn besides a strong 

 twisted awn upon the back. 



143. Pentapogon. 

 O O FloAvering glumes two-cleft, the 

 divisions awn-pointed, and be- 

 tween these an awn that is tor- 

 tuous below. 142. Diplopogon. 

 O O O Flowering glumes with two fine 

 lateral awns exceeding the length 

 of the glume, and a delicate dor- 

 sal awn. 141. Trisetaria. 

 DOOO Flowering glume with a delicate 

 awn, inserted below the point and 

 many timeslongerthanthe glume. 

 <d Second empty glume larger 

 than the first. . 139. Apera. 

 «d <] Empty glumes equal. 



140. Dichelachne. 



