772* Order 156.— GRAMINEiB. 



m Awn between the 2 teeth, twisted ; glumes very largo Danthoxia. 27 



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



m Awn dorsal above the middle. — Fls. 2— 5. Teeth cuspidate Trisetum. 2* 



— Fls. 5— 00. Teeth acutish Bromus. 80 



Te. 8. FESTUCACE^E. (Spkl. 2— QO-llrd. panicled, awnless, or the lower pale tipped with 

 a straight bristle or awn. Glumes 2.) 

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

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

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

 O Lower palo mucronate 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 Uralepib. S2 



r Glumes and pales keeled, — herbaceous, 5-veined. Fls. glomerato Dactylis. S3 



— membranous, 3-veined. Pan. spicate Kcsleria. 34 



r Gls. and pales rounded on the back, — both coriaceous. Grain free Diarrhena. 85 



— pale papery, gr. adherent Festuca. 86 



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. 87 



t Upper glume oblong, 7 — 9-veined, longer than tho fls Melica. 8S 



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



U Lower pale keeled, 8-veined, membranous like the glumes Eragrostis. 33 



U Lower palo keeled, 5-veined, usually cob webbed at base Poa. 40 



u Lower palo 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-ventricous, cordate, obscurely veined Briza. 43 



p Herbaceous. — Fls. glabrous, awnless, falcate-pointed Uniola. 44 



— Fls. silky-villous at base. Tall, stout Piikagmites. 45 



p Woody, tall (the flowering branches low). Fls. short-awned. .. Ari:ndinaria. 4<> 

 Tb. 9. IIOEDEACEuE. (Spkl. 1— 10-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 IIordeum. 45 



— Spikelets 2 — GO -flowered, — several at each joint Ely.mcs. 49 



— 1 at each joint, (w) 



w Glumo 1, in front of tho spikelet which is edgewise to raohis Loliu.m. 50 



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



—Spikelet 2-flowered Secai.e. 52 



Tit. 10. CHLORIDES. (Spkl. in 1-sided jointless spikes, 1— 00-flrd. Up. fl. abortive.) 

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



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



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



x Spikos slender, several, digitately arranged above, or, in No. 55, axillary, (z) 



Z Spikelets with 1 perfect flower,— awnless, globular, no rudiment Man'isurus. 55 



— awnless, oblong, with a rudiment. Cynodon. 5ft 



— awned, glume 3-lobed Eustacut3. 67 



z Spikelets with several perfect flowers.— Fls. awnless Eleosxne. 5S 



— Fls. awned D actyloctemuu. 50 



X Spikes thick and dense, 1— GO. Spikl. with l'pcrfect flower, (aa) 



aa Spikes several or many.— Flower with no rudiment Spartina. 60 



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



aa Spike solitary, recurved. Awns terminal and dorsal Ctenium. 62 



Tu. J 1. SACCHARIRJ5. (Spkl. in pairs or 3s, 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, 1 abortive, ? below, both naked Teipsacum. 63 



ec Spikes moncecious & above panicled, ? below enveloped in husks Zea. 64 



cc Spikes uniform, — terete. The pedunculate spkl. abortive Uottbosllia. 65 



—compressed. Both spikelets fertile Stknotapiirum. 66 



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



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



— Flowers awnless Saccharum. 63 



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



—Fls. and rachis smoothish Sorghum. 70 



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



