97. GRAMINEJE. 385 



[22. LA GURUS. Pan. spikelike. GL scarious, ending in a 

 long fringed bristle. Fl. 1, with a peduncle-like rudiment. 

 Lower pale ending in 2 long bristles and with a dorsal kneed 

 twisted awn.] 



23. POLYPOGON. Pan. close, spikelike. Gl. scarious, each 

 with a long bristle from just below the notched tip. Fl. 1. 

 Lower pale usually awned from just below the tip. 



24. GASTRIDIUM. Pan. close, spikelike. GL membranous, 

 acute, awnless, ventricose at the base, much exceeding the 

 flower. FL 1. Lower pale truncate or toothed at the end, 

 with or without a dorsal awn. 



Tr. X. AVENE^E. Spikelets with 2 or more flowers; upper 

 often barren. Gl. equalling or overtopping the flowers. 

 Lower pale awned. Style short or 0. 



25. HOLCUS. Fl. 2 ; lower perfect, awnless (or very rarely 

 awned) ; upper usually male, with a dorsal awn. Pales 

 hardening on the fruit ; tip of lower entire. 



26. CORYNEPHORUS. FL 2, perfect, awned. Awn straight, 

 jointed in the middle ; the upper portion clavate ; a tuft of 

 hairs at the joint. Tip of lower pale entire. 



27. AIRA. Pan. lax. FL 2, with or without the rudiment of 

 a third (sometimes perfected in A. ccespitosa). Lower pale 

 denticulate or bifid at the tip, terete on the back. Awn 

 dorsal, kneed (in A. c&spitosa straight). Ovary glabrous. 

 Fr. not crested. 



28. TRTSETUM. Spikelets crowded. FL 2 6. Lower pale 

 keeled with faint lateral veins, ending in 2 acute teeth, 

 awned. Awn dorsal, kneed and twisted. Ovary glabrous. 

 Fr. neither crested nor furrowed. 



29. AVENA. FL 2 or more. Lower pale not keeled with 

 lateral veins, awned, ending in 2 points. Awn dorsal, 

 kneed and twisted. Ovary hairy at the top. Fr. crested 

 and furrowed. 



30. ARRHENATHERUM. FL 2, with a rudiment; lower fl. 

 male with a long dorsal kneed and twisted awn ; upper with 

 a short straight awn. Pales herbaceous, ending in 2 points. 

 Ovary hairy at the top. Fr 



Tr. XI. FESTUCE^E. Spikelets with 2 or more flowers, upper 

 often barren. GL falling short of the lowest flower. Styles 

 short, or 0. 



