772 Order 156.— G-RAMIKE^. 



m Awn, between the 3 teeth, twisted ; glumes very large Danthonia. 27 



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



na Awn dorsal above the middle. — Fls. 2—5. Teeth cuspidate Trisktfm. 29 



— Fla. 5— 00 . Teeth acutish Beomus. 80 



Te. 8. FESTXTCACE^. (Spkl. 2 — oo-flrd. panicled, awnless, or the lower pale tipped witk 

 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-cuspidate at apex, fringe-bearded below, (q) 

 O Lower pale 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 8 cusps and 2 teeth , Tbicitspis. 81 



q Both pales fringed, lower with 1 awn and 2 cuspidate teeth TJealepis. 32 



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



— membranous, S-veined. Pan. spicate Kckleeia. 84 



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



— pale papery, gr.^lherent 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. 8T 



t Upper glume oblong, 7 — 9-veined, longer than the fls Melica. 88 



8 Spikelets 2^0-flowered, all perfect. Pales usually thin, (u) 



U Lower pale keeled, 8-veined, membranous like the glumes Erageostis. 89 



u Lower pale keeled, S-velned, usually cobwebbed at base Poa. 40 



n Lower pale convex-keeled, obscurely 9-veined. Pan. spiked Betzopteum. 41 



U Lower pale convex, 7 (— 5)-veinod, never webbed at base Gltceeia. 42 



U Lower pale convex -ventricous, cordate, obscurely veined Beiza. 43 



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



— Fls. silby-villous at base. Tall,-stout. Puragmites. 45 



p Woody, tall (the flowering branches low). Fls. short-awned. . . Aeundinaeia. 46 

 Te. 9. HOEDEACE^. (Spkl. 1— 10-fld., sessile, alternate in a spike. Eachis jointed.) 



V Spikes several. Spikl. solitary at each joint, 1-flowered Lkptuefs. 47 



V Spike single. — Spikelets l-flowered, 8 at each joint Hordeum. 4S 



—Spikelets 2 — OO ^flowered, — several at each joint Eltvub. 49 



— 1 at each joint, (w") 



"W Glume 1, in front of the spikelet which is edgewise to rachis Lolium. SO 



TV" Glumes 2, opposite. — Spikelets — 00 -flowered Teiticum. 51 



—Spikelet 2-flowered Sbcalb. 52 



'Tr. 10. CHLOEIDEj®. (Spkl. in 1-sided jointless spikes, 1— Go-flrd. Up. fl. abortive.) 

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



y Spikes raieme-like. Spkl. with several perfect fls. LEPxocnLOA. 6S 



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



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



a Sjiikelets with 1 perfect fiower,—awnless, globular, no rudiment. Manisurus. 55 



—awnless, oblong, with a rudiment Cynodon. 56 



— awned, glume 8-lobed Ed8tachy3. 57 



z Spikelets with several perfect flowers. — Fls. awnless Elbusine. 58 



—Fla. awned Dactyloctemttm. 69 



X Spikes thick and dense, 1— 00. Spikl. with 1 perfect flower, (aa) 



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



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



aa Spike; solitary, recurved. Awns terminal and dorwl Ctenium. 62 



Te. U. SACCHAEIEjE. (Spkl. in pairs or Ss, 2-flowered, the lower flower abortive. 

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

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



CC Spikes moncecious, $ abortive, 9 below, both naked Teipsacum. 68 



cc ftpikesinonoaclousiabove panicled, ? below enveloped 'mimsica Zea. 64 



CO Spikes uniform,— terete. The pedunculate spkl. abortive Eottbcellia. 65 



—compressed. Both spikelets fertile Stenotapukum. 66 



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



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



—Flowers awnless Sacchaeum. 68 



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



— Fls. and rachis smoothish Soequum, 70 



dd The lower spikelet on each spike fertile^ in a bony shell Cois. 71 



