IV. Agrostideae. 
OD Spikelets. below the glumes 2@. Alopecurus 
© Spikelets Guiemlasg above the glunes 
2 Lemmas indurate with a distinct sharp or blunt pointed, 
(> hairy callus 
4 Avns deciduous 25. Oryzopsis 
4 Avms persistent 2b. Stipa 
2 Lemmas» membranaceous, the callus not well developed 
4 Lemmas awned 
C Callus copiously hairy, the hairs sometimes as long as the 
i y Ys & 
/ sce lemmas awned from the back below the middle, 
O\the avns well developed 19. Calamagrostis 
4 Callus hairs wanting; lemmas awned from the back just 
/O below the tip, the avms not more than 1 mm. long ag. Cinna 
4 Lemmas awnless 
G Glumes abruptly avmed, the keels hispid; spikelets in 
s/o dense cylindrical panicles 25- Phleun 
(, Glumes awnless, not hispid; spikelets in open panzcles, 
WF 
/o or if contracted, not dense 
4 
W © Lemnas hyaline, thinner than the glumes in texture; 
C/ 
jZ Slumes exceeding the florets a®. Agrostis 
in texture; glumes much 
spikelets 24. hiuhlenbergia 
a 
