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- 
Jets alternate and opposite : calyx three-flowered, exterior 
valve very small, the others unequal, ovate acuminate, his- 
pid, each terminated by a long awn. 
Awns from one and a half to three inches in length. 
On the banks of Fox River, &c. August. 
Bromus ciliatus L. On Fox River. August. 
canadensis Mx. 
Arundo phragmites L. (Reed.) Near the head of the 
Mississippi. 
Elymus hystrix £ ? Involucrum one to two-leaved, lat- 
eral, linear, nearly the length of the corolla—With the pre- 
ceding. 
Atheropogon Apludoides Muhl. in Wild. Sp. pl. 4. p. 
937. Muhl Gram. p. 287. Nutt. Gen. 1. p.'78. Chloris 
curtipendula Mx. This grass has certainly a two-valved 
calyx as described by Nuttall and Muhlenberg. The inner 
valve however, is almost setiform. Neutral flower partly 
lodged in a grove of the inner valve of the hermaphrodite 
flower, two-valved, exterior valve with a very short awn be- 
low the apex, the other deeply cleft and two-awned. Her- 
maphrodite flower with lanceolate glumes, exterior 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 Mississippi generally. August. 
Oligostachyum. Nutt. 1. c. Mr. Nuttall has described 
this plant very accurately and 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. 
