772 OKDER 156. GRAMINE^E. 



m Awn between the 2 teeth, twisted ; glumes very large DAKTHONIA. 27 



m Awn dorsal below tho middle (except in the cultivated Oat) AVENA. 28 



m Awn dorsal above the middle. Fls. 25. Teeth cuspidate TUISETUM. 29 



Fls. 6 00. Teeth acutish BROMUS. 80 



TB, 8. FESTUCACE^E. (Spkl. 2 CO-flrd. panicled, awnless, or the lower pale tipped with 



a straight bristle or awn. Glumes 2.) 



n Glumes definitely 2, all tho lower fls. of the spkl. perfect, (o) 

 n Glumes several, indefinite, the lower fls. abort, and glume-like, (p) 

 O Lower pale 3-cuspidate at apex, fringe-bearded below, (q) 

 O Lower pale inucronate or awn-pointed (except in 1 Festuca). (r) 

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



q Upper pale naked, lower with 3 cusps and 2 teeth TRICUSPIS. 81 



q Both pales fringed, lower with 1 awn and 2 cuspidate teeth URALKPIS. 82 



r Glumes and pales keeled, herbaceous, 5-veined. Fls. glomerate DACTYLIS. 83 



membranous, 3-veined. Pan. spicate KCELERIA. 34 



r Gls. and pales rounded on the back, both coriaceous. Grain free DIAREHENA. 35 



pale papery, gr. adherent FESTCCA. 36 



s Spkl. 2 3-flrd. with some abortive terminal fls. Pale papery, not keeled, (t) 



t Upper glume broad-obovate, shorter than the flower EATONIA. 37 



t Upper glume oblong, 7 9-veined, longer than the fls MELICA. 38 



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



u Lower pale keeled, 3-veined, membranous like the glumes ERAGROSTIS. 39 



U Lower pale keeled, 5-veined, usually cob webbed at base POA. 40 



u Lower pale convex-keeled, obscurely 9-veined. Pan. spiked BRYZOPYRUM. 41 



u Lower pale convex, 7 ( 5)-veined, never webbed at base GLYCERIA. 42 



U Lower pale convex-veritricous, cordate, obscurely veined BRIZA. 43 



p Herbaceous. Fls. glabrous, awnless, falcate-pointed UNIOLA. 44 



Fls. silky-villous at base. Tall, stout PHRAGMITES. 45 



p Woody, tall (the flowering branches low). Fls. short-awnetl. . . ARUNDINABIA. 46 

 TB. 9. HORDEACE^E. (Spkl. 110-fld., sessile, alternate in a spike. Eachis jointed.) 



v Spikes several. Spikl. solitary at each joint, 1-flowered LEPTURUS. 47 



v Spike single. Spikelets 1-flowered, 3 at each joint HORDEUM. 48 



Spikeleta 2 00 -flowered, several at each joint ELYMUS. 49 



1 at each joint, (w) 



W Glumo 1, in front of the spikelet which is edgewise to rachis Lonusi. 50 



w Glumes 2, opposite. Spikelet 3 00 -flowered TRITICUM. 51 



Spikelet 2-flowered SECALE. 02 



TB. 10. CHLORIDES. (Spkl. in 1-sided jointless spikes, 1 Oo-flrd. Up. fl. abortive.) 

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



y Spikes raceme-like. Spkl. with several perfect fls. LEPTOCHLOA. 53 



y Spikes with sessile, 2-flowered spkl., 1 fl. a rudiment G YMNOPOGOX. 54 



X Spikes slender, several, digitatcly arranged above, or, in No. 55, axillary, (z) 



z Spikelets with 1 perfect flower, awnless, globular, no rfdiment MANISTTRUS. 55 



awnless, oblong, with a rudiment CYNODON. 56 



awned, glume 3-lobed ECSTACHYS. 57 



z Spikelets with several perfect flowers. Fls. awnless ELEUSINE. 58 



Fls. awned DACTYLOCTEMUM. 59 



x Spikes thick and dense, 1 CO. Spikl. with 1 perfect flower, (aa) 



aa Spikes several or many. Flower with no rudiment SPAETINA. 60 



aa Spikes 1, few, or many. Flower with a terminal rudiment BOUTF.LOUA. 61 



aa Spiko solitary, recurved. Awns terminal and dorsal CTENIUM. 62 



TR. 11. SACCHARIE^B. (Spkl. in pairs or 8s, 2-flowered, the lower flower abortive. 



Fertile pales thinner than the glumes, except in No. 66.) 

 bb Fls. (the fertile) imbedded in the cavities of glabrous, jointed spikes, (cc) 



CO Spikes monoecious, S abortive, ? below, both naked TRIPSACUM. 63 



cc Spikes monoecious S above panicled, ? below enveloped in husks ZEA. 64 



CC Spikes uniform, terete. The pedunculate spkl. abortive ROTTBOTLLJA. 65 



compressed. Both spikelets fertile STENOTAPHRUM. 66 



bb Fls. not imbedded, spicate or panicled, mostly long-bearded, (dd) 



dd Both spikelets of each pair fertile. Lower fl. awned EBIANTHCS. 67 



Flowers awnless SACCHAETTM. 68 



dd Only one spikl. of each pair fertile. Fls. and rachis hairy ANDROPOSON. 69 



Fls. and rachis smoothish SORGHUM. 70 



dd The lower spikelet on each spike fertile, in a bony shell Coix. 71 



