+. 
or 
=r) 
or) 
“I 
=I 
ape 
5 walt not articulated, tapering to a point - 
88 
. Spikelets 2-flowered, the first, or lower flower, staminate, its 
glume long-awned; the second hermaphrodi te and usually 
awnless . ARRHENATHERUM 
. Spikelets 2-to several-flowered, flowers all hermaphrodite or 
fec 
uppermost imperfe 
; ee articulated near the middle, the peed ‘portion elub- 
. W 
EING ERTNERIA 
6 
. Spikelets large, 1 centimeter (3 in.) or more in length; grain 
adherent to the glumes or palea, sulcate, hairy, at least. at 
the a apex. (Flowering glumes awnless in some cultivated 
odaicent eo Oe Se TO ety acne PRE anak oration CAEN 70. AVENA 
. Spikelets less than 1 centimeter long; grain free from the _— 
7 
not suleate 
. Apex of the flowering glumes finely erose-dentate, 2-lobed or 
entire at the apex, rounded on the back, awned from below 
Whe PUIG iss eee ee . DescHampsta 
. Apex of the keeled flowering glumes 2-toothed, the teeth usually 
awn-like; awns arising from above the middle. (Graphepho- 
rum melicoideum, may be looked for here.) .... 69. TrIseruM 
