610 GRAMINE.'E. (OKASS FAMILY.) 



4. T. Stricta, Vascy. I'aiiide closely spiked, 6' -12' long; spikclcts 

 ovate-oliloiig, 5- lO-flowcrcd, barely lunger than tlie pointed glumes; fiowcr- 

 ing glumes minutely awned ; culms strictly erect, 3° -0° high. — Mississippi 

 [Tracij), and westward. 



56. TRIPLASIS, Beauv. 



Low tufted fihrous-rootcd annual grasses, with branching culms, linear-.sub- 

 ulate leaves, and few loosely 2 -4-flowered spikelets, disposed in simjile lateral 

 and terminal j)auicles or racemes. Glumes 2, lanceolate, smootii. Floret 

 hairy on the margins ; flowering glume 2-cleft, with a bearded or plumo.se awn 

 between tiie tcetii ; tlie palet concave, 3-toothed. Stameus 3. Grain free. ' 



1. T. Americana, Heauv. Culms erect, I°- 2° high; leaves and sheaths 

 hairv ; awn of tlie flowering glume ])lumose, much longer than the awn-puinted 

 teeth. (Uralepis cornuta, Ell.) — Dry sandy soil, Florida to North Carolina. 

 August -Sept. %. 



2. T. purpurea. Culms procumbent or a.scending, 1°-1^° long; leaves 

 and sheaths smooth or roughish ; awn of the flowering glume bearded, ai)out 

 as long as the obtuse teeth. — Drifting sands along the coast. August - Oct. 

 — Leaves l'-4' long. Spikelets bright pur])le. 



3. T. sparsiflora, Chapm. Culms rigid (6'- 12' high) ; leaves short; 

 racemes axillary and terminal, few-flowered ; spikelets loosely 2 -4-flowered ; 

 glumes nearly equal, the lower one 2-toothed, the upper acute ; flowering 

 glume oblong, ciliate, twice the length of its awn, the palet villous above the 

 middle. — Sandy coast at Puuta Ra.ssa, South Florida. Oct. 



57. BROMUS, L. Brome Grass. 



Spikelets large, loosely panicled, 3 - many-flowered. Glumes membrana- 

 ceous, unequal, commonly keeled. Flowering glume usually awned under the 

 2-cleft apex, convex on the back, about 7-nerved at the base. Stamens 3. 

 Grain flattened and grooved on the inner face, and adherent to the palet. 

 Culms simple. Leaves commonly broad and flat. 



1. B. Ciliatus, L. Perennial; panicle diffuse, the sleuder drooping 

 branches mostly in pairs ; spikelets lanceolate after flowering, 10 - 12-flowered ; 

 lower glume 1 -nerved, the upper 3-nerved; flowering glume 7-nerved, hairy 

 along the margins, or, in var. purgans, Gray, hairy all over, about twice as 

 long as the awn ; culms 2°- 4° high ; leaves and sheaths smooth or downy. — 

 Kiver banks and rich soil, chiefly in the upper districts. June. 



2. B. seealinus, L. (Cheat or Chess.) Annual; panicle spreading, 

 with clustered, at length drooping branches; -spikelets (i'-T long) 8-10- 

 flowered, oblong-ovate ; lower glume .5-nerved, the upper 7-nerved ; the flow- 

 ering glume convex, 7-nerved, awnl ess or short-awned; culms l°-2° high; 

 leaves and sheaths smooth or downy. — Grain fields, etc. Introduced. 



3. B. racemosus, L. Panicle erect, contracted in fruit ; flowers larger, 

 the flowering glume longer than the upper one, barely longer than its awn ; 

 otherwise like B. seealinus. — Grain fields. Introduced. 



