GRASS FAMILY. 229 
2. Hordeum pusillum Nutt. Little Bar- 
ley. (Fig. 530.) 
Hordeum pustillum Nutt. Gen. 1:87. 1818. 
Culms 4’-15’ tall, erect, or decumbent at the 
base, smooth and glabrous. Sheaths loose, usually 
shorter than the internodes, smooth and glabrous, 
the upper often enclosing the base of the spike; 
ligule very short; leaves 14’-3/ long, 14//-2’’ wide, 
erect, smooth beneath, rough above; spike 1/—3/ 
in length; spikelets usually in 3’s, the central one 
containing a palet and perfect flower, the lateral 
imperfect; scales awned, the empty ones scabrous, 
those of the central spikelet and the lower ones of 
the lateral spikelets dilated above the base; flower- 
ing scale smooth, that of the central spikelet 3//— 
4’ long, short-awned, the corresponding scale in 
the lateral spikelets smaller and very short-stalked. 
In dry soil, Ontario to British Columbia, south to 
Nebraska, Arkansas, Texas and California; also spar- 
ingly introduced along the coast from Virginia to Flor- 
ida. June-July. 
3. Hordeum jubatum I,. Squirrel-tail Grass. (Fig. 531.) 
/ Hordeum jubatum I,. Sp. Pl. 85. 1753. 
Culms 10’-2%° tall, erect, simple, usually 
slender, smooth and glabrous. Sheaths usually 
shorter than the internodes, generally loose, smooth 
and glabrous; ligule 14’ long or less; leaves 1/-5/ 
long, 1/’-2’ wide, erect, rough; spike 2’—-4’in length; 
spikelets usually in 3’s, the central one containing 
a palet and perfect flower, the lateral imperfect; 
empty scales consisting of slender rough awns I/— 
24’ long; flowering scale of the central spikelet 
3//-4’’ long, scabrous at the apex, bearing a slender 
rough awn 1/-214’ long; the corresponding scale in 
the lateral spikelets short-awned, about 3// long in- 
cluding its pedicel, sometimes reduced toarudiment. 
In dry soil, Ontario to Alaska, south to Kansas, 
Colorado and California. Naturalized in the east from 
Tabrador and Quebec to New Jersey and Pennsylvania. 
July—Aug. 
4. Hordeum murinum J,. Wall Barley. (Fig. 532.) 
Hordeum murinum I,. Sp. Pl. 85. 1753. 
Culms 6/—2° tall, erect, or decumbent at the base, 
smooth and glabrous. Sheaths loose, shorter than 
the internodes on the long culms, overlapping on the 
short ones, the uppermost often inflated and enclosing 
the base of the spike; ligule very short; leaves 1/-6/ 
long, 1/’-3// wide, rough; spikes 2/-4/ in length; 
spikelets usually in 3's; scales awned, the empty ones 
awn-like, scabrous, those of the central spikelet 
broader and ciliate on the margins, bearing awns 9//— 
12’’ long, those of the lateral spikelets similar, with 
the exception of the second scale, which is not ciliate; 
flowering scales scabrous at the apex, bearing an awn 
about 1’ long, those of the lateral spikelets about 6/’’ 
long, the corresponding scale in the central spikelet 
somewhat smaller. 
2 
On ballast and sparingly in waste places, southern New Ss 
York and New Jersey. Also from Arizona to California. 
Adventive or naturalized from Europe. June-July. 
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