382 OBDER 155. GRAMINE^E. 



m Awn between the two teeth, twisted ; glumes very large DASTHOXIA. 30 



tn Awn dorsal below the middle (except in the cultivated Oat). Oat AVE.VA. 31 



m Awn dorsal above the middle. Flowers 25. Teeth cuspidate TRISETUM. 33 



Flowers 5 00 . Teeth acutish. Brome B ROM us. 33 



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



with a straight bristle or awn. 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 mucronate or awn-pointed (except in one Festuca). . .(r) 

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



4 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. ABUNDO. 35 



9 Lower and upper pale both entire and pointless at apex GEAPHKPHORUM. 36 



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



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



membranous, 3-veined. Panicle spicate KCF.LEUI A. 39 



r Glumes and pales rounded on the back, both coriaceous. Grain free DIARRHENA. 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 E ATONI A. 42 



t Upper glume oblong, 7-9-veined, longer than the flowers. Jfelic .MKUCA. 43 



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



u Lower pale keeled, 3-veined, membranous like the glumes ERAGROSTIS. 41 



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



u Lower pale convex-keeled, obscurely 9- veined. Panicle spiked BR I zoi-r RUM. 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 UNIOJ.A. 49 



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



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



9. HORDEACE^E. (Spikelrts \-\Q-flowered, sessile, alternate in a spVce. Rachis jointed.) 



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



u Spike single. Spikelets 1-flowered, 3 at each joint. Barley UOKDEUM. 53 



Spikelets 2- 00 - flowered, several at each joint. Hedgehog ElYMUS. 64 



1 at each joint... (it) 



to Glume 1, in front of the spikelet which is edgewise to tlio rnchis. Darnel LOLIUM. 55 



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



Spikelet 2-flowered. Bye SECALE. 57 



10. CHLORIDES. (Spikelets in l-sidedjointless spikes, 1 - CO flowered. Uppei flower abortive.) 

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



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



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



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



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



awnless, oblong, with a rudiment C YNODOX. 61 



awned, glume 3-lobed '. EUSTACHYS. 62 



awned, glume acute CHLORIS. 63 



z Spikeleta with several perfect flowers. Flowers awnless ELEUSINE. 64 



Flowers awned DACTYLOCTEMUM. 65 



a Spikes thick and dense, 100. Spikelets with 1 perfect flower... (oa) 



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



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



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



U SACOHAR.IE.iE. (Spttelets in pairs or 3's, 2-flowered. the lower flower abo five. Fertile pales 



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

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



cc Spikes monoecious, abortive, ? below, both naked. Sesame TRIPSACU*. 69 



c Spikes monoecious & above panicled, $ below enveloped in husfa. liaise ZEA. 70 



oc Spikes uniform, terete. The pedunculate spikelet abortive ROTTBCJLLIA. 71 



compressed. Both spikelets fertile STENOTAPHRUM 73 



