58 Professor Douglass and Dr. Torrey 
Dieynta. 
Panicum longisetum.* Stem terete, smooth, a foot and 
a half high ; leaves lanceolate, very large, ( about an inch 
broad) subglaucous ; spike compound, resembling a pani- 
cle, dense, clandestine at base, somewhat nodding ; spike- 
. lets alternate and opposite : calyx three-flowered, exterior 
valve very small, the others ca a ovate acuminate, his- 
pid, ay terminated by a long aw 
A rom one and a half to shree inches in length. 
On a banks of Fox River, &c. August 
Bromus ee EL. On Fox River. August. 
nadensis Mx, 
Arundo tiravincion I. (Reed.) Near the head of the 
Mississippi. 
lymus hystrix £2?  Involucrum one to two-leaved, lat- 
eral, linear, nearly the long 2 of the corolla With the pre- 
ce ing. 
curtipendula Mx, ‘his grass-has ee rs a ‘two-valved 
calyx as described by Nuttall and itlentiens The inner 
valve however, is almost setiform. Neutral flower partly 
lodged in a grove of the inner valve of the pene 
flower, two-valved, exterior valve with a very short awn. 
low the apex, the other deeply cleft and two-awn 
mapbrodite flower with lanceolate glumes, itterioF one tri- 
fid, or with three short awns, interior one bifid. Authers 
blood red. Nuttall remarks that the neuter flower consists 
of one folded valve; this however, did not seem to be the 
case in the specimens I examined. Has. On the Ouis- 
consin river and the ob generally. August 
Oligostachyum. Vutt. | Mr. Nuttall has described 
this plant very accurately sia minutely in the work quoted. 
He discovered it on the plains of the Missouri. Capt. 
Douglass found it in abundance on the Mississippi above = 
Sandy Lake. 
TETRANDRIA. 
Comus canadensis Z. On the River St. Mary’s. 
