116 



37 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. 



118. COLPODIUM 



38. Flowering glumes rounded on the back 39 



38. Flowering glumes compressed-keeled ■- - - ^ 



39. Nerves of the flowering glumes prominent 40 



39. Nerves of the flowering glumes obscure or manifest only near 



the apex 



40. Flowering glumes long-attenuate pointed or awned. (Some 



species of Bromus may be looked for here) ... 107. Melica 



40. Flowering glumes awnless, usually broad and obtuse (acumi- 



nate in Panicularia acutiflora) 41 



41. Spikelets with 1- to several club-shaped or hooded empty 



glumes above the fertile florets 107. Melica 



41. Spikelets without club-shaped or hooded glumes above the 



perfect floret; outer empty glumes scarious and much shorter 

 than the flowering glumes 122. Panicularia 



42. Flowering glumes obtuse, awnless 43 



42. Flowering glumes acute, often awned 44 



43. Empty glumes usually small and decidedly shorter than the 



flowering glumes. Low grasses of the seashore or alkali 

 plains of the interior 123. Puccinelli a 



43. Empty glumes usually about as long as the nearest flowering 



<dume, the latter often scabrous or more or less pubescent. 



117. Poa 



44 Flowering glumes entire, acute, or awned from the apex, 

 5-nerved 124 - Festuca 



44. Flowering glumes obtuse, usually awned just below the entire 



or2-toothedapex; styles inserted below the hairy apex of 

 the ovary 125 - Bromus 



45. Spikelets 1-2 cm. (J-l in.) or more long, short-awned (nearly 



awnless) from the entire or 2-toothed apex; grain adnate to 



thepalea 125 - Bromus 



45. Spikelets smaller, very rarely 1 cm. long, awnless; flowering 

 glumes 5-nerved, often hairy or pubescent on the nerves 

 below, and with (or without) a tuft of long cobwebby hair 

 at the base 117 - PoA 



