ORDEII 155. GRAMINE^K. 



397 



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

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

 tles at the apex and a soft flexuous awn from above 

 the middle of the back. Grain coated, furrowed. 

 11 Fls. paniculate. 



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



68", few (69) in the very pimple purple panicle ; fls. 

 (d) separate, bearded at base ; gl. (g} unequal; Ivs. nar- 

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



2 T. palustre (Mx.) Spkl. (a, b) 3-flwd. 2J", 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-oo -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-veined. 



Lower pale keeled. . . (b) 

 Glumes veiny, the lower 35, upper 5 7-veined. Lower 



pale con vex... (a) 



a Awn much shorter than its pale. Pan- 

 icle spreading Nos. 1, 2 



a Awn as long as its pale. Panicle 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. Kit I in II Gr. Wild Chess. More or less hairy, 1$ 3f; spkl. drooping, closely 



7-12-flwcL, densely silky; lower pale, .ouch the larger; pan. small, if Dry. 



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



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

 ple. 48' long, spikelets 810" long, drooping. (T) Fields. Eur. 



3 B. racemosu* L. Erect Chess. Spkl. ovate-oblong, glabrous ; closely 8-12-flwd., 



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



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



about 6-flwd., fls. closely imbricated; awns straight, 34". @ @ Fields: rare. 

 E> B. uuioloides II. & K. Rescue G. Culm erect, H 3f, smoothish ; pau. nar 

 row, 6 10', nodding; spkl. lance-oblong, compressed, 1', 8-12-liwd. (T) Cult. South. 



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



(6), 7-11-flwd., the fls. soon separating; pale (c) compressed-carinate above, silky- 

 haired at edge, twice longer than its straight awn; culm 2 41' ; Ivs. some hairy, w 

 Shady banks : common. July, August. 

 |3. purg-an*. Plant finely and closely pubescent all over. 



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



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

 awn. (J) Banks, Pa., and N. Rare. 



8 B. BRIZOIUES. Culm If, eix-ct ; Ivs. narrow, conduplicate, rigid ; pan. erect, with a 



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



