382 ORDER 155. GRAMINEJE. 



m Awu between the two teeth, twisted ; glumes very large DASTHONIA. 30 



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



m Awn dorsal above the middle. Flowers 26. Teeth cuspidate TKISKTCM. 32 



Flowers 5 00 . Teeth acutish. Brome BKOMOS. 33 



8. FESTUCACE^G. (Spikelets 2-00 -flowered, panided, aicnless, or the lower pale tipped 



with a straight bristle or aim. Glumes 2.) 



n 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 mucrouate or awn-pointed (except in one Festuca). . .(r) 

 o Flowers beardless. Lower pale obtuse or acute, not at all awiied. ..{) 



f Lower pale 2- or 3-cuspidate and 1-2-awned. Upper pale entire TRICUSPIS. 34 



9 Lower pale 2-cuspidate and 1-awned. Upper pale entire. 8 12f. ARUNDO. 35 



q Lower and upper pale both entire and pointless at apex GRAPHEPHOKUM. 36 



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



r Glumes and pales keeled, herbaceous, 5- veined. Flowers glomerate DACTYUS. 38 



membranous, 3-veined. Panicle spicate KCELERIA. 39 



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



pale papery, grain adherent. Fescue FESTUCA. 41 



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



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



t Upper glume oblong, 7-9-veined, longer than the flowers. Melic MELICA. 43 



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



M Lower pale keeled, 3-veined, membranous like the glumes ERAGROSTIS. 44 



u Lower pale keeled, 5-veined, usually cobwebbed at base. Spear Grass POA. 45 



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



M Lower pale convex, 7-( 5)-veined, never webbed at base. Manna. GLYCERIA. 47 



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



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



Flowers silky-viNous at base. Tall, stout. Seed PHRAGMITES. 60 



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



9. HOBDEACEyE. (SpikelHa 1-lO-fiotcered, s&urile, alternate in. a spike. Rachis jointed.) 



9 Spikes several. Spikelet solitary at each joint, 1-flowered LEFTURUS. 62 



ti Spike single. Spikelets 1-flowered, 3 at each joint. Barky HORDKUM. 53 



Spikelets 2- oo - flo wered, several at each joint. Hedgehog ELYMUS. 54 



1 at each joint . . . (w) 



w Glume 1, in front of the spikelet which is etige\vise to the rachis. Darnel LOLIUM. 55 



w Glumes 2, opposite. Spikelet 3 - 00 - flowered. Witch G. Wheat TRITICUM. 56 



Spikelet 2-flowered. Rye SECALE. 57 



10. CHLORIDES. (SpiMets in l-sided jointless spikes, 1 - GO floicered. Uppei flower abortive.) 

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



y Spikes raceme-like. Spikelets with several perfect flowers LKPTOCHLOA. 58 



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



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



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



awnless, oblong, with a rudiment CYNODON. 61 



awned, glume 3-lobed EUSTACH YS. 82 



awned, glume acute CHLORIS. 63 



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



Flowers awned DACTYLOCTENIUM. 65 



x Spikes thick and dense, 1 00. Spikelets with 1 perfect flower... (aa) 



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



aa Spikes 1, few, or many. Flower with a terminal rudiment BOCTELOUA. 67 



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



J BACCHARIE^E. (Spilcelets in pairs or 3's, 2-flpwered. the lower flower abo five. Fertile pales 



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

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



cc Spikes monoecious, abortive, $ below, both naked. Sesame TRIPSACUM. 69 



x Spikes monrecious $ above p.inicled, $ below enveloped in hus7&. Maize ZEA. 70 



cc Spikes uniform, terete. The pedunculate spikelet abortive ROTTBCELLIA 71 



compressed. Both spikelets fertile STBNOTAPHRO.V 73 



