_ 
> 
_ 
“I 
i 
~I 
H 
oO 
pe - 
ies) 
. Pericarp free or separable from the grain 
59 
get and prolongation of the rachilla naked; empty jr 
nequal; flowering glume awned from the apex. 63. APERA 
. Empty glumes smooth or minutely scabrous ome Fi the keel. 
GROSTIS 
. Empty glumes more or less hairy and of about she same aye 
as the flowering glumes 
. Empty glumes connate at the base; palea none; inflorescence 
icle. 
a dense, cylindrical or oblong, ike Aes gr 
. ALOPECURUS 
. Empty glumes distinct; palea present; Rrra capitate, 
very woolly 64. Lacurus 
: Flowering glumes flattened on the back, strongly indurated 
42. Mriiiv 
and shinin 
g 
. Flowering glumes not: flattened on the back nor strongly in- 
durated 20 
. Rachilla prolonged behind the palea (the 1-floweved species 
re) 21 
of Melica may be looked for he 
Rachilla not prolonged 22 
. Empty glumes longer than the Bestia’ pipes callus and 
red, 
prolongation of the rachilla ha owe 
elongated, and spike-like Ti, Astoria 
: vagus glumes, or at least one of them, corer than the flow- 
ring glume; callus and rachilla naked -. 56. ARcTAGROSTIS 
. Nerves of the flowering glume densely pred gray nearly to 
2B 
LEPHARONEURON 
r 
. Nerves not densely silky-villous Z 
at maturity; first empty glume usually shore than the see: 
ond and exe eded by the flowering glume . 51. SporoBoius 
. Pericarp closely adherent to the grain _..... -..------..- 24 
A ney glumes saeitnisne esd and much more delicate in 
25 
texture then the e empty 9 
herbaceous. hart 
not more » delicate i in texture than the empty nen 26 
. Empty eae: abruptly awn-pointed, the keels elit! ciliate. 
. PHLEUM 
Empty perc ia abruptly ae Seti — nae or 
simply sca 58. AGRosTIs 
