382 ORDER 155. GRAMINE^E. 



m A wn between the two teeth, twisted ; glumes very large DAJJTHOKIA. SO 



m Awn dorsal below the middle (except in the cultivated Oat). Oat AYEXA. 31 



m Awn dorsal above the middle. Flowers 2 5. Teeth cuspidate TRISKTUJI. 33 



Flowers 5 00 . Teeth acutish. Broun* B BOH us. 33 



1 FE8TUCACE /&. (Spikelets 2-00 -flattered, panicled, awnless, or the lower pale tipped 

 with a straight brittle or awn. Glumes 2.) 



* Glumes definitely 2, all the lower flowers of the spikelet perfect... (o) 



n Glumes several, indefinite, the lower flowers abortive and glume-like... (p) 

 o Flowers fringe-bearded at the base. Pales 3-cuspidate or entire... (q) 

 o Flowers beardless. Lower pale mucronate or awn-pointed (except in one Fetuca)...(r) 

 o Flowers beardless. Lower pale obtuse or acute, not at all awned. ..() 



7 Lower pale 2- or 3-cuspidate and 1-2-awned. Upper pale entire TRICCSPIS. 34 



q Lower pale 2-cuspidate and 1-awned. Upper pale entire. 8 12f AKUNDO. 35 



g Lower and upper pale both entire and pointless at apex GRAPHEPHORDM. 36 



q Lower pale long-pointed, trliite as well as the glumes and hair. Pampas Grass GYNERIUM. 37 



r Glumes and pales keeled, herbaceous, 5-veiued. Flowers glomerate DACTYLIS. 38 



membranous, 3- veined. Panicle spicate KCEI.ERIA. 39 



r Glumes and pales rounded on the back, both coriaceous. Grain free DIARRUKNA. 40 



pale papery, grain adherent. Fescue. . . .FESTUCA. 41 



Spikelets 2-3-flowered, with some abortive terminal flowers. Pale papery, not keeled. . .(<) 



( Upper glume broad-obovate, shorter than the flower EATONIA. 42 



t Upper glume oblong, 7-9-veined, longer than the flowers, ifelic . MKLICA. 43 



Spikelets 2-50-flowered, all perfect. Pales usually thin. ..(u) 



u Lower pale keeled, 3-veined, membranous like the glumes EHAGROSTIS. 44 



u Lower pule keeled, 5-veined, usually cobwebbed at base. Spear Grass PDA. 45 



u Lower pale convex-keeled, obscurely 9-veined. Panicle spiked BRIZOPVKUM. 46 



u Lower pale convex, 7-( 5)-veined, never webbed at base. Manna. .. G LYCERI A. 47 



u Lower pale convex-ventricous, cordate, obscurely veined. Quake BRIZA. 48 



p Herbaceous. Flowers glabrous, awnless, falcate-pointed UNIOLA. 49 



Flowers silky-villons at base. Tall, stout. Reed PHRAGMITES. 50 



p Woody, tall (the flowering branches low). Flowers short-awned ARUNDINARIA. 51 



9. HOBDEACEjE. (Spikelets \-lO-floicered, sessile, alternate in a spike. Rachis jointed.) 



v Spikee several. Spikelet solitary at each joint, 1-flowered LEPTURUS. 52 



o Spike single. Spikelets 1-flowered, 3 at each joint. Barley HORDEUM. 53 



Spikelets2- OO- flowered, several at each joint. Hedgehog ELYMUS. 64 



1 at each joint... (in) 



to Glume 1, in front of the spikelet which is edgewiM) to th rachis. D.irnel LOLIUM. 55 



u> Glumes 2, opposite. Spikelet 3- 00 -flowered. Witch G. Wheat TRITICDM. 56 



Spikelet 2-flowered. Bye SECALE. 57 



10. CHLORIDES. (Spikelets in 1-sided jointlesi spikes, 1-00 floicered, Dppei flower abortive.) 

 x Spikes very slender, many, in an equilateral raceme... (y) 



y Spikes raceme-like. Spikelets with several perfect flowers LEPTOCHLOA. 68 



y Spikes with sessile, 2-flowered spikelets, one flower a rudiment GYMNOPOGON. 59 



x Spikes slender, several, digitately arranged above, or, in No. 60, axillary... (z) 



Spikelets with 1 perfect flower, awnless, globular, no rudiment MANISCRCS. 60 



awnless, oblong, with a rudiment CYNODON. 61 



awned, glume 3-lobed EUSTACHYS. 62 



awned, glume acute CHLORJS. 63 



z Spikelets with several perfect flowers. Flowers awnless ELECSINE. 64 



Flowers awned DACTYLOCTKNIUM. 65 



* Spikes thick and dense, 1 00. Spikelets with 1 perfect flower... (oo) 



aa Spikes several or many. Flower with no rudiment SPARTINA. 66 



tut Spikes 1, few, or many. Flower with a terminal rudiment BOCTELOUA. C7 



aa Spike solitary, recurved. Awns terminal and dorsal CTKNIUM. 68 



4 BACOIIARIE.*. (Spikelets i'i pairs or 3's, 2-flowered. the lower flower aba Kve. Fertile pales 



thinner than the glumes, except in No. 72.) 

 U Flowers (the fertile) imbedded in the cavities of glabrous, jointed spikes... (cc) 



ec Spikes monoecious, ( abortive, $ below, both naked. Sesame TRIPSACUM. fl9 



x Spikes monoecious f above punicled, $ below enveloped in husks. Uaize ZEA. 70 



or Syikes uniform, terete. The pedunculate spikelet abortive ROTTBCELLIA 71 



eompressed. Both Bpikelets fertile STENOTAPHKUM 73 



