II, Hordeae 
© Rachis disarticulating at maturity, spikelets 3 at a node 12. Hordeum 
> Rachis continuous, spikelets 1 or 2 at esch node (sometimes 
4 more in Klymus condensatus) 
“ 
' 
Ms spike es 1 at each node 
4 First glume wanting; spikelets placed edgewise to the 
f 
© rachis 13. Lolium 
4 First glume present; spikelets placed flatwise to 
Q@ the rachis 10. Agropyron 
» Spikelets usually 2 at each node ll, &lyms 
III. Avenease, 
O Lemmas awned (short or wanting in trisetum 461111) 
Z Lemmas awned from between the teeth of a bifid apex, 
18. Danthonia 
(, the avm flattened, twisted 
~ Lemmas dorsally awned, the avms not flattened 
15, Trisetum 
4 Lemmas kecled, avmed from above the middle 
a Lemmas rounded on the back, avmed from below 
& the middle 17. Deschampsia 
> Lemmas awnless 
2 Spikelets jointed above the glumes, these similar in 
14, Koeleria 
(> shape 
» Spikelets jointed below the glumes, these dissimilar, 
16, Sphenopholis 
(6 the second widened above 
