ORDER 155. GRAMINE.E. 



397 



32. TRISETUM, L. Spkl. 2-5-flwd. Glumes 

 ?, shorter than the fls. Lower pale with two bris- 

 Jles at the apex and a soft flexuous awn from above 

 the middle of the back. Grain coated, furrowed. 

 U Fls. paniculate. 



1 T. purpurascens Torr. Spkl. (p) about 4-flwd., 



08", few (6 9) in the very pimple purple panicle; fls. 

 (<i) separate, bearded at base ; gl. (g) unequal; Ivs. nar- 

 row-linear ; culm erect, 2 3f. Mountain bogs, N. June. 



2 T. pal it st re (Mx.) Spkl. (a, b) 3-flwd. 2^", the upper fl. 



abortive ; middle fl. with a bent awn its own length ; pan. 

 narrow, 40' ; Ivs. very short (23'); culm slender, 2f. 

 Plant smooth. Wet meadows. May July, (c, pale.) 



3 T. molle (Mx.) Spikelets 2-flwd., 3" ; upper fl. with a bent awn its own length ; gi. 



lance-linear; panicle as in No. 2; Ivs. broader and longer; plant 2f, minutely 

 downy. Rocky hills, N. July. 



33. BROMUS, L. BROME G. Spikelets 

 5-00 -flwd. Gl. unequally veined. Lower pale 

 5-9-veined, awned from below the mostly bifid 

 tip. Upper pale ciliate on its 2 keels, adhering to 

 the linear grain. Coarse grasses, with flat leaves, 

 and large, nodding, panicled spikelets. June, July. 



Glumes narrow, the lower 1-veined, upper 3-veiiied. 



Lower pale keeled. . . (b) 

 Glumes vein}', the lower 35, upper 5 7-veined. Lower 



pale convex., .(a) 



a Awn much shorter than its pale. Pan- 

 icle spreading Nos. 1, 2 



a Awn as long as its pale. Parade erect, contracted in fruit Nos. 3, 4 



b Lower pale compressed-carinate, awn very short No. 5 



b Lower pale rounded on the back, the awn conspicuous.... Nos. 6, 7 



1 B. Ka [mil Gr. Wild Chess. More or less hairy, 1| 3f; spkl. drooping, closely 



7-12-flwd., densely silky; lower pal. .auch the larger; pan. small. 11 Dry. 



2 B. secaliiius L. Cheat or Chess. (<-) Nearly glabrous, 2 4f; spkl. ovate, turgid, 



glabrous, 7-10-flwd.. fls. (a) goon diverging, blunt, awned or not; panicle nearly sim- 

 ple. 48' long, spikelets 810" long, drooping. Fields. Eur. 



3 B. racemosus L. Erect Chess. Spkl. ovate-oblong, glabrous ; closely S-12-flwd., 



awns straight, 4" ; pan. simple ; plant slender, some hairy, (i) Fields. Eur. 



4 B. inollis L. Downy Chess. Plant downy, with spreading hairs; spkl. o"ate, 



about 6-flwd., fls. closely imbricated ; awns straight, 31". @ Fields : rare. 



5 B. uiiioloides II. & K. Rescue G. Culm erect, H 3f, smoothish ; pau. nar- 



row, 6 10', nodding ; spkl. lance-oblong, compressed, 1', 8-12-fl wd. Cult. South. 



6 B. filial us L. Pan. compound, 5 8', soon nodding; spkl. at first lance-fusiform 



(i), 7-11-flwd., the fls. soon separating: pale (c) compressed-carinate above, silky- 

 haired at edge, twice longer than its straight awn; culm 2 4f ; Ivs. some hairy. 2( 

 Shady banks : common. July, August. 

 ft. purg-an*. Plant finely and closely pubescent all over. 



7 B. sterilis L. Pan. compound, soon 1-sided and nodding; ped. capillary; spkl. 



linear-oblong, about 5-flwd., puberulent; fls. linear-subuiate, scarcely as long as the 

 awn. Banks, Pa., and N. Rare. 



8 B* ERIZOIDES. Culm If, erect ; Ivs. narrow, conduplicate, rigid ; pan. erect, with a 



few large, hanging, ovate, awned spikelets ; pale dilated, ear-shaped above. Cult. 



