. No. 9. 
STIPA SCRIBNERI Vasey. 
Rootstock short, horizontal, with coarse fibrous roots. 
Culms tufted, erect, terete, smooth, 14 to 24 feet tall, unbranched. 
Leaves; from base half as long as the culm; of stem 3 or 4 ; sheaths smooth, 
or lower ones slightly scabrous, nearly equaling or slightly exceeding the inter- 
nodes, close; blade flat below, involute above toward the long tapering point, mid- 
nerve inconspicuous, | to 2 lines wide, 4 to 10 inches long; ligule truncate, 1 line 
long. 
Inflorescence an erect slender panicle, its base inclosed by the upper sheath, 
narrow and close, 5 to 8 inches long; rachis slightly angular, not fexuous; branches 
in twos or threes, appressed, 1 ‘to 2 inches long, each bearing 2 to 4 spikelets on 
short pedicels. 
Spikelets 1-flowered; empty glumes unequal, the first 6 to 7 lines, and second 
5 lines long, linear-lanceolate, acuminate, both 3-nerved, smooth; floral glume 
about 4 lines long, white-hairy, the hairs longer above forming a crown or tuft 1 
line long; awn rather slender, 8 to 9 lines long, not hairy; stipe short, acute; palet 
less than 1 line long, obtuse, and adherent to grain. 
Grain nearly cylindrical, yellow, opaque, 2 to 24 lines long. 
PuaTE IX; a, spikelet dissected and enlarged. 
Arizona and New Mexico. Generally in strong tufts. 
