570 OKAMINK.i:. (CIJASS FAMILY.) 



03. LKPTOCHLOA. Sjiikes racemose, fllifonn. Flowering glume awnleaa. 

 54. DIPLACHNK. Spikes rocuiuose. Flowering glume uucruuate or uwiied. 



Tribe IX. FKiSTUCKjE. Spikeleta panlcled, few -many-flowered, the flowers all per- 

 fect, or the tipiiei moat, and rarely tlie lowest imperfect or abortive. Glumes mem- 

 brauaceout or rarely indurated, uwnlotts, or uhort-awned at or near the tip. 



• Flowers perfect, or the uppermost abortive, 

 t- Flowering glumes 2-cleft and awned at the apex. 



65. TRIODIA. Spikelets few-flowered. Nerves of the glumes hairy, excurrent. 



50. TRIPLASIS. Spikelets 3-flowered. Flowering glume and palea fringed, the mid-nerve 



of the glume extended Into a bearded awn. 

 57. BROMUS. Spikelets large, few - mauy-flowered. Flowering glume rounded on the 



back, and awned below the 'J-cteft apex. 



1- -I- Flowering glumes entire, awnless (except in No. 58). 



-w- Olumes obtuse or rounded on the bock. 



68. PESTUCA. Spikelets mostly terete. Flowering glumes rigid, often awned at the tip. 



59. MELICA. Spikelets short and thick, few-flowered, the upper flowers imperfect, con- 



volute. Glumes 5-nerved, obtuse, scarious-margined. 



60. GLYCERIA. Spikelets terete or flattish. Flowering glume 7-nerved, scarious at the 



tip. 



61. DIARRHEN.\. Spikelets few, several-flowered. Flowering glume coriaceous, 3-nerved, 



acute. Culms nearly leafless. 



++ ++ Glumes keeled on the back. 



62. DACTYLIS. Spikelets In dense l-sided clusters. Glumes awn-pointed, ciliate on the 



keel. 



63. EATONIA. Spikelets 1 - 3-flowered. Lower glume narrow, the upper 3-nerved, obo- 



vate, enclosing the florets. 



64. POA. Spikelets few-flowered. Flowering glume thin, 5-nerved, scarious on the mar- 



gins, commonly woody below. 



65. ERAGROSTIS. Spikelets few - many-flowered, compressed. Flowering glume 3- 



nerved, acute. Paleee persistent. 



* * Lower flowers imperfect. 

 6G. XJNIOLA. Spikelets broad and flat. Glumes rigid, compressed, the 3 - G lower ones 

 empty. 



67. PHRAGMITES. Spikelets villous, 3 - G-flowered. Lowest flower triandrous. 



* • * Flowers dioecious. 



68. DISTICHLIS. Spikelets large, flat, many-flowered. Glumes rigid, rounded on the 



back. 



69. MONANTHOCHLOE. Spikelets single, terminal, 3 - 5-flowered. Leaves very short and 



rigid. 



Tbibb X. HOKDEJE. Spikelets 1 - several-flowered, sessile on opposite sides of the 

 Jointed rachis of the terminal spike. Empty glumes 1-2, rigid, rarely wanting. Up- 

 permost flowers imperfect or abortive. 



* Spikelets solitary at each Joint of the rachis. 



70. LOLIUM. Spikelets placed edgewise on the rachis. Empty glume one. 



71. AGROPYRUM. Spikelets placed flatwise on the rachis. Empty glumes two. 



* * Spikelets 2 -4 at each joint of the rachis. 



72. HORDEUM. Spikelets 3 at each Joint, 1-flowered, the lateral ones sterile. 



73. ELYMU8. Spikelets 2 - 4 at each joint, 1 - several-flowered. Empty glumee 2, 



collateral. 



74. ASPRELLA. Spikelets 1 -3 at each joint. Empty glumes none. 



