_Graminaceae 73 
JJ. Leaf-sheaths villous-pubescent; stem hairy near the nodes. E. 
E. condensatus pubens Pip. 
AAA. Lemmas and glumes both glabrous.or merely scabrous: 
K. Lemma-awn 0—5 mm. long. 
L. Glumes awl-shaped; lemma-awn 3——5 mm. long. E. 
E. aristatus Mer. 
LL. Glumes lanceolate; lemma often awnless. 
M. Spikelets 4—8-flowered; glumes 6—12 mm. long. E. 
E. triticoides Buckl. 
MM. Spikelets 2—4-flowered; glumes 12—15 mm. long. 
N. Glumes longer than the spikelet, rigid. E. 
E. virginicus submuticus Hook. (Virginia Wild Rye) 
NN. Glumes shorter than the spikelet, not rigid. W. 
E. virescens Pip. 
KK. Lemma-awn 6—10 mm. long; glumes longer than the spikelet (less the awns). 
F.. E. macounij Vas. 
KKK. Lemma-awn 8—30 mm. long; glumes shorter than the spikelet (less the 
awns). ; 
O. Leaf-sheaths glabrous; leaf-blade smooth or scabrous above; lemma slightly 
scabrous. W. E. E. glaucus Buckl. (Smooth Wild Rye) 
OO. Leaf-sheaths hairy; leaf-blade hairy above; lemma glabrous. W. 
E. marginalis Rydb. 
KKKK. Lemma-awn 30—50 mm. long; glumes apparently 4, shorter than the 
spikelet (less the awns). E. (Sitanion leckenbyi.) 
E. leckenbyi Pip. 
SITANION BRISTLY WILD RYE 
Perennial, caespitose. Leaves flat. Spikelets 1—-3 at each joint of the rachis, 
2- to several-flowered, rachis jointed, easily breaking into pieces. Glumes awned, 
many-parted from near the base or merely 2-cleft or entire and subulate; an apparent 
3rd glume setaceous when present. Lemma either with | terminal awn, or else 3-cleft 
and each lobe with a terminal awn. Palet as long as the lemma, entire or 2-awned or 
2-toothed. Stamens 3. Grain hairy at tip, adherent. (Gk. sitas—wheat or grain; likely 

because the plants have wheat-like heads. ) 
A. Glumes with 3 to many lobes or divisions; leomma-awns 8—10 cm. long. E. (S. 
villosum. ) §. jubatum Sm. 
AA. Glumes entire or with 2 lobes or divisions; lemma-awns less than 8 cm. long. 
B. Glumes 3—5-veined. 
C. Leaves green, 2—5 mm. wide. C. 
S. rubescens Pip. 
CC. Leaves glaucous, 5—-8 mm. wide. W. C. 
S. planifolium Sm. 
BB. Glumes 2-veined. 
D. . Leaf-sheaths pubescent. 
E. Leaves pubescent on both sides; middle lemma-awn |.5—4 cm. long. E. 
(S. ciliatum; S. velutinum.) 
S. hystrix Sm. 
EE. Leaves pubescent beneath, scabrous above; middle lemma-awn 4——7 cm. 
long. E. (S. elymoides.) 
S. montanum 5m. 
DD. Leaf-sheaths glabrous or glabrate or scabrous. 

