46 Graminaceae 
K. Leaf-blade flat; ligule 4 mm. long; hairs at base of lemma about 1/7 
its length. E. C. cusickii Vas. 
KK. Leaf-blade often rolled up when dry; ligule 3 mm. long; hairs at 
base of lemma about 2/3 its length. E. 
C. neglecta Gaert. (Pony-grass) 
JJ. Leaf-blade rigid. 
L. Panicle dense, spike-like. 
M. Panicle 4—8 cm. long; glumes acute, subcoriaceous. 
N. Leaves rolled up for their whole length. E. 
C. montanensis Beal 
NN. Leaves rolled up only near tip. W. 
C. crassiglumis Thurb. 
MM. Panicle 5—20 cm. long; glumes acuminate, membranous. C. E. 
(C. hyperborea elongata; C. hyperborea americana.) 
C. hyperborea Lange 
LL. Panicle narrow but too open to be spike-like. 
O. Stem without hairs below the joints; awn about equaling the lemma; 
spikelets brown or purplish. C. E. (C. inexpansa cuprea.) 
C. inexpansa Gray (Bog Reed-grass) 
OO. Stem pubescent with short reflexed hairs below the joints; awn Ge: 
short or none; spikelets purplish. W. 
C. inexpansa barbulata Kearn. 
II. Lemma with copious hairs at base. C. E. 
C. scribneri Beal 
HH. Panicle loose and open even after flowering. 
P. Spikelets 2—4 mm. long (4—5 mm. in C canadensis acuminata) ; ligule 
2—4 mm. long. 
Q. Glumes 2—2.5 mm. long; ligule 2 mm. long; lemma |.5 mm. long. E. 
C. macouniana Vas. 
QQ. Glumes 3—5 mm. long; ligule 4 mm. long; lemma 2—3.5 mm. long. 
R. Leaf-blade 1.5—-3 dm. long; panicle mostly tinged with purple; awn 
attached near middle of lemma. 
S. Glumes 3—3.5 mm. long, acute, scarcely exceeding the lemma; lem- 
ma erose-truncate. E. 
C, canadensis Beauv. (Blue-joint Grass) 
SS. Glumes 4—5 mm. long, long attenuate, exceeding the lemma; lemma 
acute. C. E. GC. canadensis acuminata Vas. 
RR.  Leaf-blade 3—4 dm. long; panicle whitish-green; awn attached near 
apex of lemma. E. 
C. blanda Beal 
PP. Spikelets 5—-6 mm. long; ligule often 8—12 mm. long. 
T. Panicle somewhat purplish; palet less than 2/3 as long as the lemma. 
Wa aE. C. langsdorfii Trin. 
TT. Panicle whitish or pale-green; palet more than 2/3 as long as the lemma. 
C. C. langsdorfii lactea Kearn. . 
CINNA INDIAN-REED 
Perennial, tall. Leaf-blades flat. Spikelets in a spreading panicle. JRachilla 
jointed above the glumes, often prolonged beyond the base of the palet as a small pro- 
jection. Glumes persistent, lanceolate, acute, awnless, with hispid keel, the first |-veined, 
the second 1——3-veined. Lemma about as long as the glumes, usually raised slightly 
‘above them, 3-veined, usually short-awned on the back near the apex. Palet nearly as 
Ce 0. ot ae ae 
