Vv 
118 
New Grasses. 
By Dr. GEO: VASEY. * 
TRISETUM MONTANUM.—Culms! ¥ to 2% feet high, smooth, 
rather slender; cauline leaves 6 to 10 inches long, the upper 
sometimes equaling the panicle, somewhat scabrous, the lower 
sheaths pubescent, ligule about 1 line long, blunt; panicle 4 
to 6 inches long, loose and open but not spreading, rays in 
clusters of three to five, unequal, 4% to 1% inches long, suberect, 
minutely scabrous, flowering nearly to the base, the longer -rays 
with five to seven appressed branchlets; spikelets about 2% lines 
long, two-flowered and with a minute hairy pedicel; outer 
glumes unequal, acute, scarious margined, smooth, except on the 
keel, the lower narrow, about 1 line long, the upper one-half 
longer, broadly lanceolate ; flowering glumes about 2 lines long, 
narrowly lanceolate, acuminate and terminating in two short, fine 
setae, obscurely five-nerved, minutely scabrous, with short hairs 
at the base and on the rhachilla, the awn from about the upper 
third, diverging, rather longer than its glume; palet narrow, 
little shorter than its glume, bidentate; ovary not hairy at the 
apex. 
This must include what I published in Wheeler’s Report, Vol. 
VI., as 7: alpestre, Beaur., which has short leaves, and a very 
different panicle and flowers. It has been mistaken for an open 
panicled form of 7. subspicatum. 
DIPLACHNE REVERCHONI.—Culms cieeoasee erect, fili- 
form, simple, 4 to 10 inches high; leaves mostly radical, 
numerous, setaceous, smooth, 1 to 2 inches long, only one 
or two on the culm near the base; raceme simple spike-like, 
2 to 3 inches long; spikelets sessile, appressed and mostly 
imbricate, alternate or somewhat one-sided, 3 to 4 lines 
long, seven to nine-flowered ; empty glumes lanceolate, obtusish, 
compressed, one-nerved, the upper about 1 line long, the lower 
¥% shorter; flowering glumes ovate-lanceolate, acutish,three- 
nerved, smooth, except a slight pubescence at the base and on 
the rhachis, bilobed at the apex, and with a short awn a little 
exceeding its glume; palet little shorter than its glume, some- 
what stalked at the base. 
