GRASS FAMILY. 231 
3. Elymus Canadénsis L. Nodding Wild Rye. (Fig. 535.) 
Elymus Canadensis I,. Sp. Pl. 83. 1753. 
Elymus glauctfolius Willd. Enum. 1: 131. 1809. 
Elymus Canadensis var. glauctfolius Torr. Fl. U. S. 1: 
137. 1824. 
Culms 2%4°-5° tall, erect, simple, smooth and gla- 
brous. Sheaths usually overlapping; ligule very 
short; leaves 4/-1° long or more, 2//-10’’ wide, 
rough, sometimes glaucous; spike 4/—12’ in length, 
broad, stout, often nodding, its peduncle much ex- 
serted; spikelets divergent from the rachis, 3-5- 
flowered; empty scales narrowly lanceolate or awl- 
shaped, rigid, 3-5-nerved, 8’’-16’’ long, including the 
long slender rough awns; flowering scales 4’’-7’’ long, 
nearly smooth to hirsute, bearing a slender scabrous 
straight or divergent awn 10//-25’’ in length. 
On river banks, Nova Scotia and New Brunswick to Al- 
berta, south to Georgia, Texas and New Mexico. Ascends 
to 2100 ft. in Virginia. July—Aug. 
4. Elymus glatcus Buckl. Smooth Wild Rye. (Fig. 536.) 
Elymus glaucus Buckl. Proc. Acad. Phila. 1862: 99. 1862. 
Elymus Americanus V. & §.; Macoun, Cat. Can. Pl. 4: 
245. 1888. 
Elymus Sibiricus var. Americanus Wats. & Coult. in A. 
Gray, Man. Ed. 6, 673. ‘1890. 
Culms 2°-5° tall, erect, simple, smooth and glabrous. 
Sheaths often shorter than the internodes, usually 
glabrous, rarely pubescent; ligule 1/’ long or less; 
leaves 4/-12’ long, 2//-8’’ wide, smooth beneath, 
sometimes rough above; spike 3/8’ in length, nar- 
row, slender; spikelets appressed to the rachis, 3-6- 
flowered; empty scales narrowly lanceolate, 4//—6/’ 
long, acuminate or awn-pointed, rigid, 3-5-nerved; 
flowering scales smooth or slightly rough, 5//-6’” long, 
) bearing aslender straight rough awn 6//-9” in length. 
In moist soil, Ontario to British Columbia, south to 
Michigan, Arizona and California. June—Aug. 
5. Elymus Macounii Vasey. Macoun’s Wild 
Rye. (Fig. 537.) 
Elymus Macounti Vasey, Bull. Torr. Club, 13: 119. 1886. 
Culms 1°-3° tall, erect, simple, smooth and glabrous. 
Sheaths shorter than the internodes; ligule very short, 
truncate; leaves 2’-6’ long, 1//-244’/ wide, rough, es- 
pecially above; spike 2/-5’ in length, narrow, slender, 
often somewhat flexuous; spikelets appressed to the 
rachis, single at each node, or the lower sometimes in 
pairs, 1-3-flowered; empty scales (occasionally 3) awl- 
shaped, 3-nerved, rough, 3/’-4’’ long, bearing a slender 
straight rough awn, 3/’-5’’ in length; flowering scales 
32’’-5’ long, rough toward the apex, bearing a slender 
straight awn 3//-5’’ long. 
Prairies, Manitoba and Assiniboia, south to Nebraska and 
New Mexico. July-Aug. 
