HORDEUM  GRAMINEX 777 
produced beyond the flower, the lower empty glumes often reduced 
- to awns and forming an appar ent involucre around the spikelets. 
Empty glumes rigid: the flowering ones:rounded on the back, 5- 
nerved at the apex, awned. Palets about equalling the glumes. 2 
keeled. Stamens 3. Styles very short, distinct. Grain usually 
adherent to the glume, hairy at the summit. 
H. jubatum 1. Sp. 85. Stems 10-30 inches high, erect, usually slen- 
der smooth, sheaths usually shorter than the internodes: smooth: ligules 
}@ line long, or less: leaves 1-5 inches long, 1-2 lines wide, erect, rough: 
spikes 2-4 inches long: spikelets usually in threes, the central one, con- 
taining a perfect flower; lateral ones imperfect: empty glumes consisting 
of slender rough awns 1-24 inches long: flowering glumes of the central 
spikelets 3-4- lines long: scabrous at the apex, bearing a slender rough awn 
1-24 inches long, the corresponding glume ofthe lateral spikelets short- 
awned. On dry soil eastern Oregon to California, Pennsylvania and 
Labrador, 
H. maritimum With. Arrang. 172. A smooth somewhat glaucous 
annual: stems 6-18 inches long: sheaths about as long as the internodes, 
the upper one inflated: ligules a mere ring: leaves 1-3 inches long, mostly 
inyolute: spike subterete, scarcely exserted, 1-2 inches long, the rachis 
breaking up when mature: spikelets an inch long, including the stiffawns: 
empty glumes all lanceolate, not ciliate, one of each lateral spikelet a little 
broader. Southwestern Oregon to California: introduced from Europe. 
H. Gwtssoneanum Parl. Pl. Palerm. 244. Stems smooth often decum- 
bent, 10-16 inches long: leaves thin, flat, finely pubescent, 1-3 inches long, 
about 1 line wide: spikes subterete, exserted, 1-2 inches long, breaking 
up when mature, empty glumes reduced to mere bristles, 6-8 lines long, 
except the inner one to each lateral spikelet is twice as wideas the others: 
flowering glumes ova), rough, 5-nerved, the awn 6 lines long. Oregon to 
. California, introduced from Europe. 
H. murrnum L. Sp. 85. A coarse decumbent annual: sheaths about 
equalling the internodes: ligules very short: leaves 144-3 inches long, often 
hairy: spike 2-4 inches long: often partly included in the upper sheath sli- 
ghtly compressed, soon breaking up when mature: spikelets, including the 
awns, 1-2 inches long, empty giumes of the middle spikelets lanceolate, 
with ciliate margins: flowering glumes scabrous above, flat on the back, 
8-10 lines long. In waste places, introduced from Europe. 
H. pusillum Nutt. Gen. i, 87. Stems 4-16 inches high, smooth: 
sheaths loose, usually shorter, than the internodes, smooth, the upper 
often enclosing the base of the spike; ligules very short: leaves 1%-3 
inches long: 34-2 lines wide, smooth beneath, rough above: spike 1-3 
inches long, spikelets usaally in threes: glumes awned, the empty ones 
scabrous: flowering glumes smooth, that of the central spikelets 3-4 lines 
long: short-awned that of the lateral spikeletssmaller. In dry soil Californ- 
ia to Brit. Columbia Nebraska and Texas. 
H. nodosum L. Sp. ed 2, 126. H. pratense Huds. Stems 1-4 feet 
high, often geniculate below, simple, smooth; sheaths shorter than the in- 
ternodes: ligules 14 line long, truncate: leaves 144-6 inches long, 1-3 lines 
wide, flat, rough: spike 1-4 inches long, flat, often arcuate: empty glumes 
awn-like: flowering glumes of the central spikelets 3-4 lines long, bearing 
an awn 3-6 lines iong; that of the latera! spikelets much smaller. Common 
in meadows, California. to Alaska, Indiana and Texas also in Europe and 
Asia. 
H. boreale Scribn. & Smith |. c. 24. Stems slender, erect, smooth: 
sheaths shorter than the internodes the lower ones pubescent: ligules very 
