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GRASS FAMILY. 221 
5. Bromus stérilis L. Barren Brome-grass. (Fig. 510.) 
Bromus sterilis l,. Sp. Pl. 77. 1753- 
Culms 1°-2° tall, erect, simple, smooth and gla- 
brous. Sheaths usually shorter than the internodes, 
smooth or rough, the lower sometimes pubescent; 
ligule 1’/ long; leaves 3’-9’ long, 1’’-3’’ wide, us- 
ually more or less pubescent; panicle 5/-10’ in 
length, the branches ascending or often widely 
spreading, not one-sided, stiff; spikelets few, 5—10- 
flowered, spreading or pendulous; empty scales 
acuminate, glabrous, the first 1-nerved, the second 
longer, 3-nerved; flowering scales 6’/-8’’ long, acu- 
minate, 7-nerved, scabrous on the nerves, the awn 
7//-12’’ long. 
In waste places and ballast, eastern Massachusetts to 
Pennsylvania and Ohio. Locally naturalized or adven- 
tive from Europe. Native also of Asia. June-July. 
6. Bromus Porteri (Coulter) Nash. Porter’s Chess. (Fig. 511.) 
Bromus Kalmii var. Portert Coulter, Man. Bot. Rocky 
Mt. Region, 425. 1885. 
Bromus Portert Nash, Bull. Torr. Club, 22: 512. 1895. 
Culms 1%°-3° tall, erect, simple, pubescent below 
the nodes. Sheaths shorter than the internodes, 
glabrous or sometimes softly pubescent; ligule 4/7 
long, truncate; leaves 1//-3/’ wide, rough, those of 
the culm 4/-9’ long, the basal narrow and about 
one-half of the length of the culm; panicle 3/—6’ in 
length, its branches drooping and flexuous, at least 
when old, the nodes of the axis pubescent; spikelets. 
5-10-flowered, 9’’-15’’ long, on slender flexuous 
pedicels; empty scales pubescent, the first narrower 
than the second, both 3-nerved; flowering scales 
5/’-6’’ long, obtuse, 5~7-nerved, densely pubescent 
with long silky hairs; awn 1//-2// long. 
In dry soil, South Dakota to Montana, south to 
western Nebraska, New Mexico and Arizona. July— 
Aug. 
7. Bromus Kalmii A. Gray. Kalm’s 
Chess. (Fig. 512.) 
Bromus purgans I,. Sp. Pl. 76. — 1753? 
Bromus Kaimii A. Gray, Man. 600. 1848. 
Culms 114°-3° tall, erect, simple, smooth and gla- 
brous. Sheaths shorter than the internodes, more or 
less pubescent; ligule very short; leaves 234’-7’ long, 
1//-4/’ wide, sparingly pubescent; panicle 2/-6’ in 
length, open, its branches usually flexuous; spikelets 
6-10-flowered, 6’’-12/’ long, on slender flexuous pedi- 
cels; empty scales pubescent, the first narrow, acute, 
3-nerved, the second longer, broad, obtuse or mucro- 
nate, 5-7-nerved; flowering scales about 4’ long, 7-9- 
nerved, densely silky pubescent, the awn 1//-114’’ in 
length. 
In woods and thickets, Quebec to Manitoba, south to 
Massachusetts, Pennsylvania, Illinois and Iowa. July- 
Aug. 
