Graminaceae 49 
NN. Panicle 5—30 cm. long; plant taller, not alpine. W. C. E. 
(A. asperifolia; A. grandis; A. scouleri.) 
A. exarata Trin. (Northern Red-top) 
JJ. Panicle open, loose. 
O. Lemma with an awn from near its base. C. 
A. howellij Scribn. 
OO. Lemma with an awn at or above the middle, or awnless. 
P. Inflorescence very diffuse; herbage scabrous. 
Q. Lemma awnless. W.C.E. (A. scabra.) 
A. hyemalis B. S. P. (Rough Bent-grass) 
QQ. Lemma-awn scarcely exserted. C. (A. geminata. ) 
A. hyemalis geminata Hitch. (Mountain Bent-grass) 
PP. Inflorescence not diffuse. 
R. Lemma awnless; palet small or none. 
S. Plants 1—3 dm. high; spikelets 1.5 mm. long; lemma | mm. 
long; panicle pale. E. (A. tenuiculmis.) 
A. idahoensis Nash 
SS. Plants 3—10 dm. high; spikelets 2.2—3 mm. long; lemma 
2 mm. or more long; panicle pale or dark. 
T. Panicle pyramidal, dark purple; palet none. C. E. (A. 
attenuata. ) 
A. oregonensis Vas. 
TT. Panicle elongated, oblong, not dark purple; palet 0.2—0.6 
mm. long. E. 
A. schiedeana Trin. 
RR. Lemma awned; palet none. C. 
A. caning &. (Brown Bent-grass) 
CALAMOVILFA SAND-GRASS 
Perennial, rather tall, rigid, with horizontal rootstocks. Spikelets in more or less 
diffuse panicles; rachilla jointed above the glumes, not prolonged beyond the palet. 
Glumes acute, awnless, persistent, unequal, chartaceous, thick, compressed-keeled. Lemma 
chartaceous, |-veined, awnless, acute, with a tuft of hairs at base. Palet chartaceous, 
2-keeled, 2-toothed, as long as the lemma, wide. (Gk. kalamos—a reed; vilfa—an- 
other genus of grasses; hence a reed-like Vilfa.) E. 
C. longifolia, Hack. 
PHLEUM TIMOTHY 
Annual or perennial (ours), erect. Leaf-blades flat. Spikelets flat, in a dense 
cylindric or ovoid spike-like panicle; rachilla very short, jointed above the glumes, some- 
times extending beyond the lemma as a short spine. Glumes persistent, almost equal, 
membranous, compressed-keeled, |——3-veined, abruptly pointed, the keel projecting as 
a point or awn. Lemma shorter and wider than the glumes, thin, hyaline, truncate or 
denticulate, awnless, 5-veined, enclosing the palet. Palet nearly equaling the lemma, 
narrow, hyaline. Stamens 3. Grain ovoid, free. (Gk. phleos—some kind of reed.) 
A.  Spike-like panicles 1.5—-3 cm. long; awn of glume 2 mm. long; plant 2—6 dm. 
higee pW. -C.. EF. P. alpinum L. (Mountain Timothy) 
AA.  Spike-like panicles 3—17 cm. long; awn of glume | mm. long; plant 4—10 
dm. high. W. E. F. pratense Le SCRimothy) 
