HOFFMANN: FLORA OF BERKSHIRE COUNTY. 213 
E. muricata (Michx.) Fernald.— Vid. Rhodora, 17: 106 (1915). 
Sandy shores and roadside ditches; frequent. 
Differs from E. Crusgalli in the trichomes of the mature spikelets 
which are stiffer and coarser, strongly divergent and have a con- 
spicuous papillose or pustular base, giving to the spikelets and conse- 
quently to the inflorescence a very muricate appearance. 
ELYMUS. Wild Rye. 
Key to Elymiis. 
a. Awns straight (when mature and dry); palet 5.2-8 (rarely 8.5-9.2 in 
E. virginicus) mm. long. 
6. Glumes broad (0.9-2 mm. wide), strongly indurated and more or less 
curved at the base. 
Lemmas and glumes glabrous or merely scabrous on the margins. 
E. virginicus. 
Lemmas and glumes villous-hirsute. 
E. virginicus, var. hirsutiglumis. 
h'. Glumes narrow, often setiform (0.4-0.8 mm. wide), indurated and 
terete below, essentially straight. 
Rachis-joints 3-4.5 (rarely 5-8) mm. long; spikelets 2-4-flowered; 
leaves and sheaths glabrous E. riparius. 
Rachis-joints 1.5-3 mm. long; spikelets 1- (rarely 2-)flowered; 
foliage villous E. striatus. 
a'. Awns curved outward toward apex (when mature and dr,v); glumes 15-20 
(rarely 8-27) mm. long, rather narrow but not setiform, flat above; 
spikelets 4-7-flowered; leaves 13-20 mm. wide; palet 9-11 (-15) mm. 
long E. canadensis. 
E. canadensis L. — Riverbanks; common in the valley. 
E. riparius Wiegand.— Vid. Rhodora, 20: 84 (1918). River- 
banks; common in the valley, also in Mt. Washington. 
Differs from E. canadensis in the more spreading spikelets, straight 
awns, longer and more slender glumes, uniformly hispidulous l(MHnias 
and shorter palet. From E. striatus, it may be recognized by tlu" 
coarser habit, glabrous foliage, larger rachis-joints, scabrous lenunas, 
and larger palet. 
E. striatUB Willd. — Allu\ial rixcrbanks; frociuent. Williams- 
town; Stockbridge; Great Harrington; Sheffield. 
E. virginicus L. — Riverbanks and moist woods; common. 
var. hirsutiglumis (Scribn.) Ilitclic. — (/•.'. }iirsuti<ihiiiii.s 111. I'l. 
ed. 2.) 
Alluvial l)aiiks; Stoekbrid^c; (Ircat iJarrinntoii; ."-^lu'llirld. 
