116 
es 
“I 
. Panicles erect, strict, or with the rigid branches widely diver- 
gent; hairs on the callus few; nerves of flowering glumes 
obsolete 119. DuponTia 
37. Panicles nodding, the spreading branches usually capillary. 
18. CoLpopiuM 
38. Flowering glumes rounded on the back 39 
38. Flowering glumes compressed-keeled : 45 
39. Nerves of the flowering glumes prominent 
39. Nerves of the flowering glumes obscure or manifest only near 
the a 42 
40. Flowering glumes long-attenuate pointed or awned. (Some 
species of Bromus may be looked for here) ... 107. Menica 
40. Flowering glumes awnless, usually broad and obtuse (acumi- 
nate in Panicularia acutiflora) 
41. Spikelets with 1- to several club-shaped or hooded empty 
glumes above the fertile florets _............. 107. Merica 
41. pig area without chet spaped or hooded glumes pete wi 
periect floret; outer empty g 
than the flowering glumes. ............- 122. PaNICULARIA 
42. Flowering glumes obtuse, awnless 43 
42. Flowering glumes acute, often awned 44 
fe 
Ned 
Empty glumes usually small and decidedly shorter than the 
flowering glumes. Low grasses of the seashore or alkali 
plains of the interior 123. Puccine.iia 
. Empty glumes usually about as long as the nearest flowering 
' glume, the latter often scabrous or more or less pubescent 
Li 
és 
Poa 
44. Flowering glumes entire, acute, or awned from the apex, 
5-nerved 124. Festuca 
- Flowering glumes obtuse, usually awned just below the entire 
or 2-toothed apex; styles inserted below the hairy apex of 
the ovary 125. Bromus 
i 
m 
s ss pean 1-2 cm. (3-1 in.) or more long, short-awned (nearly 
wnless) from the entire or 2-toothed apex; grain adnate to 
the ea 125. Bromus 
45. Spikelets smaller, very rarely 1 em. long, awnless; flowering 
glumes 5-nerved, often hairy or pubescent on the nerves 
below, and with (or without) a tatt of long cobwebby hair 
at the base 117. Poa 
