77« Order 1S6.— aEAMINE^. 



m Awn between the 2 teeth, twisted ; glumes very larjo Dahthowia. 2T 



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



m Awn dorsal above the middle. — Fis. 2— 5. Teeth cuspidate Trisktum. 29 



— FIs. 5— 00. Teeth acutish Bdomub. SO 



Tiu 8. FESTUCACE^. (Spkl. 2— oo-flrd. panicled, awnless, or the lower palo tipped with 

 a straight bristle or awn. Glumes 2.) 

 jx Glumes definitely 2, all the lower fla. of the spkl. perfect, (o) 

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

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

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

 O L*jwer pale obtuse or acute, not at all awned. (s) 



q Upper pale naked, lower with 8 cusps and 2 tooth TKicrsprs. SI 



q Both pales fringed, lower with 1 awn and 2 cuspidate teeth ^ Uralepis. 83 



r Glumes and pales keeled, — herbaceous, 5-veined. Fls. glomerate Dacttlis. 8* 



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



r Gls. and pales rounded on the back, — both coriaceous. (Jrain free Dlarriibna. 86 



— pale papery, gr. adherent Festuca, 86 



B 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-veinod, longer than the fls Mblica, 88 



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



u Lower pale keeled, 3-Teined, membranous like the glumes Ebagrostis. 39 



U I^ower pale keeled, 5- veined, usually cobwebbed at base Poa. 40 



U Lower pale convex-keeled, obscurely 9-veined. Pan-, spiked Bkyzoptrum. 41 



U Lower palo convex, 7 (^5)-veinod, never webbed at base Gltceria. 42 



U liOwcr pale conves-ventricous, cordate, obscurely veined BarzA. 43 



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



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



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

 Tb. 9. HORDE ACE J3. (Spkl. 1— 10-fld., sessile, alteniato in a spike. Pvaehis jointed.) 



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



V Spike single.— Spikelets 1-flowered, 8 at each joint IIordeum. 4S 



— Spikelets 2 — go -flowered,— several at each joint Eltmus. 49 



— 1 at each joint, (w) 



•w Glume 1, In front of tho spikelet which is edgewise to rachis Lolium. 50 



W Glumes 2, opppsite. — Spikelet 8 — 00 -flowered Triticum. 51 



— Spikelet 2-flon'ered Sbcale. 52 



Te. 10. CHLOEIDEjE. (Spkl. in 1-sided jointless spikes, 1— co-flrd. Up. fl. abortive.) 

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



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



y Spikes with sessile, 2-flowered spkl., 1 fl. a rudiment Gtmnopoqom. M 



X Spikes slender, several, digitately arranged above, or, in No. 55, axillar3^ (z) 



Z Spikelets with 1 perfect flower, — awnless, globular, no rudimen t Manisuecs. 55 



— awnless, oblong, with a rudiment Ctnodon. 56 



— awned, glume 3-lobed Eustacut5. 57 



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



— Fla. awned Dactyloctemum. 50 



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



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



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



aa Spike solitary, recurved. Awns terminal and dorsal Ctenium. 02 



T». 11. BACCIIAllIE^. (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 glabrons, jointed spikes, (cc) 



CO Spikes monoscious, $ abortive, ? below, both naked Tripsacum, 63 



cc Spikes moncecious J above panicled, ? below enveloped in Jiusks Zea. 64 



CO Spikes uniform, — torete. The pedunculate spkl. abortive Eottbchllia. 65 



— compressed. Both spikelets fertile Stenotapubum. 66 



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



dd Both spikelets of each pair fertile.— Lower fl. awned Ep-ianthcs. 67 



— Flowers awnless S acchaeum. 68 



dd Only one spikl. of each pair fertile. — Fls. and raehls hairy Andropogon. &9 



— Fls, and rachis smoothish Soequum. 70 



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



