72 Graminaceae 
GG. Leaf-blades scabrous; both glumes of the lateral spikelets about the 
same width. W.E. (H. nodosum depressum. ) 
H. nodosum L. (Wild Barley) 
FF. 3-4 of the glumes of each cluster widest above the base. 
H. Leaves rough above, smooth beneath; spikes 4—6 times as long as wide. 
E. HR. pusillum Nutt. (Little Barley) 
HH. Leaves smooth on both sides; spikes 2—3 times as long as wide. U. 
(H. maritimum.) H. geniculatum All. (Sea Barley) 
AA. All 3 spikelets of each group fertile, the spike thus 6-rowed. W. E. 
H. hexastichon L. (Cultivated Barley) 
ELYMUS WILD RYE 
Annual or perennial. Leaves flat. Spikelets 2—9-flowered, sessile, in clusters of 
(4, in a spike; rachis continuous or jointed. Glumes nearly equal, narrow, |—3- 
veined, acute or awned, persistent. Lemma shorter than the glumes, rounded on the 
back, obscurely 5-veined, acute or obtuse or awned from the apex. Palet a little shorter 
than the lemma, 2-keeled. Stamens 3. Grain hairy at top, adherent. (Gk. elyein=to 
roll up; in some species the spikes are somewhat rolled up in the leaf-sheaths. ) 
A. Glumes and lemmas puberulent or ciliate or more hairy. : 
B. Lemma-awn 0—5 mm. long. 
C. Glumes nearly equal, nearly equaling the spikelet. W. (Apparently E. ¥ 
- mollis of How. Fl.) E. arenarius L. (Sea Lyme-grass) ; 
CC. Glumes either very unequal or else not over 2/3 as long as the spikelet. 
D. Lemma long-villous; lower glume not over 2/3 the upper. Ex 
E. flavescens S. & S. (Yellow Wild Rye) % 
DD. Lemma puberulent or pubescent; glumes equal or nearly so. 
E. Glumes mere bristles; lemma 8—10 mm. long. E. 
E, innovatus Beal 
EE. . Glumes too wide to be bristles; lemma 10—12 mm. long. 
F. Spike dense, 7—15 cm. long; glumes 14—16 mm. long. W. E. 
(E. vancouveriensis. ) 
E. dasystachys Trin. 
FF. Spike not dense, 15—25 cm. long; glumes 8—I2 mm. long. E. A 
(E. littoralis of How. FI.) 
E. arenicola S. & 8. 
BB. Lemma-awn 2—5 cm. long; glumes subulate, nearly equaling the spikelet 
(less the awns). E. (Sitanion brodiei.) 
E. canadensis L. (Nodding Wild Rye) 

AA. Glumes glabrous or merely scabrous; lemmas puberulent or ciliate or more hairy. 
G. Lemma-awn | cm. or more long. 
H. Perennial; lemma and its awn 1—3 cm. long; spikelets 3—6-flowered. W. 
E. borealis Seribn. 
HH. Annual; lemma and its awn 5—7 cm. long; spikelets 1|—2-flowered. U. 
he E. caputmedusae L. 
GG. Lemma-awn less than | cm. long. 
ib ao. interrupted; spikelets 5—-9-flowered; lemma |12—14 mm. long. (See 
II. Spike not interrupted; spikelets 3—6-flowered; lemma 8—10 mm. long. 
J. Leaf-sheaths glabrous and smooth; stem glabrous. E. 
E. condensatus Presl. (Giant Wild Rye) 
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