GRASS FAMILY. 227 
2. Agropyron dasystachyum (Hook.) Vasey. Northern Wheat-grass. 
(Fig. 525.) 
Triticum repens var. dasystachyum Hook. FI. Bor, Am. 2: 
254. 1840. 
Agropyrum dasystachyum Vasey, Spec. Rept. U. S. Dept. 
Agric. 63:45. 1883. 
Glaucous, culms 1°-3° tall, erect, from long running 
rootstocks, simple, smooth and glabrous; sheaths 
shorter than the internodes; ligule very short; leaves 
2/-9’ long, 1/’-3’’ wide, flat, or becoming involute in 
drying, smooth beneath, rough above; spike 214/—7/ in 
length; spikelets 4-8-flowered; empty scales 3-5-nerved, 
lanceolate, acuminate or short-awned, 3//-414’’ long; 
flowering scales broadly lanceolate, 5-nerved, 4!2//-6’’ 
long, acute or short-awned, denscly villous. 
Hudson Bay to the Northwest Territory and Wyoming 
and to the shores of Lakes Huron and Superior. Summer. 
3. Agropyron violaceum (Hornem.) Vasey. 
(Fig. 526.) 
Triticum violaceum Hornem, Fl. Dan. f/. 2044. 1832. 
Agropyrum violaceum Vasey, Spec. Rept. U. S. Dept. Agric. 
63:45. 1883. 
Culms 6/—2° tall, erect, simple, smooth and glabrous. 
Sheaths usually shorter than the internodes; ligule very 
short; leaves 2/-6’ long, 1//-3’’ wide, flat or involute, 
rough or sometimes smooth beneath; spike 1/-4/ in 
length, occasionally longer, 2’’-3/’ broad; spikelets 3-6- 
flowered; empty scales broad, usually purplish, scarious 
on the margins, 5-7-nerved, 4/’-6’’ long, acute or acum- 
inate, sometimes awn-pointed, rarely long-awned; flow- 
ering scales often purplish, 5-7-nerved, scarious on the 
margins, 4’’-6’’ long, acuminate or short-awned, the awn 
rarely as long as the body. 
Quebec to western Ontario and British Columbia, south to 
the mountains of New England, New York and Pennsylvania, 
and in the Rocky Mountains to Colorado. Ascends to 5500 ft. 
in the White Mountains. Also in northern Europe and Asia, 
Summer. 
4. Agropyron ténerum Vasey. Slender Wheat-grass. 
y 
Agropyrum tenerum Vasey, Coult. Bot. Gaz. 10: =] 
258. 1885. . x 
\/| 
Glabrous, culms 2°—3° tall, erect, simple, often / 
slender, smooth. Sheaths usually shorter than } ¥ 
the internodes, glabrous; ligule very short; 
leaves 3/-10’ long, 1’’—2’’ wide, flat or involute, 
rough; spike 3/-7’ in length, usually nhrrow 
and slender; spikelets 3-5-flowered; empty if 
scales 4’’-6”" long, acuminate or short-awned, 
3-5-nerved, scarious on the margins; flowering 
scales 5//-6’/ long, 5-nerved, awn-pointed or 
short-awned, scarious on the margins, often 4 
rough toward the apex. ! 
In dry soil, Manitoba and Minnesota to British 
Columbia, south to Nebraska, Colorado and Cali- 
fornia, Reported from the Northeast Territory, } 
July-Aug. 
