98. aEAMINEiE. 407 



rudiment. Pales unequal, scarious ; dorsal awn falling abort 

 of the glumes, or 0. — -A. canina wants the inner pale. 



[22. LAGUB,t7S. Pan. spikelike. 01. scarious, ending in a 

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

 Lower pale ending in 2 long bristles and with a dorsal 

 kneed twisted awn.] 



23. PoLTPOGON. Pan. close, spikelike. 01. scarious, each 

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

 Lower pale usually awned from just below the tip. 



24 GASTnrDitTM. Pan. close, spikelike. Ol. 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. A VENEJE. Spikelets with 2 or more flowers ; upper 

 often barren. 01. equalling or overtopping the flowers. 

 Lower pale awned. Style short or 0. 



25. HoLCtrs. 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. OoaTNBPHOKTJS. Fl. 2, perfect, awned. Awn straight, 

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

 hairs at the joining. Tip of lower pale entire. 



27. AiKA. 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. ccespitosa straight). Ovary glabrous. 

 Fr. not crested. 



28. TmsBTUir. Spikelets crowded. Fl. 2 — 6. Lower pale 

 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 with lateral veins, 

 awned, ending in 2 points. Awn dorsal, kneed and twisted. 

 Ovary hairy at the top. Fr. crested and furrowed. 



30. Ahbhestathebum. Fl. 2, with a rudiment ; lower fl. 

 male with a long kneed and twisted awn from below its 

 middle ; upper with a short straight awn from near the 

 tip. Pales herbaceous, ending in 2 points. Ovary haiiy 

 at the top. Fr. oblong, terete, downy, not furrowed. 



