A text-book of grasses with especial reference to the economic species of the United States . mooth, usually glaucous, erect,tufted, 3 to 5 feet high; sheaths smooth;ligule membranaceous, short, about 1 , toothed, often lacerate; blades flat,3^ to 3^2 inch wide, scabrous, bearing oneach side at base a small point or auricle;spike 3 to 5 inches long, somewhat nodding;the rachis-joints pubescent on the edges;spikelets 2-flowered, or with a third rudi-mentary floret; glumes narrow, l-nerved,almost subulate, scabrous on the keel;lemma lanceolate, much-compressed, 5-nerved, ciliate with stif


A text-book of grasses with especial reference to the economic species of the United States . mooth, usually glaucous, erect,tufted, 3 to 5 feet high; sheaths smooth;ligule membranaceous, short, about 1 , toothed, often lacerate; blades flat,3^ to 3^2 inch wide, scabrous, bearing oneach side at base a small point or auricle;spike 3 to 5 inches long, somewhat nodding;the rachis-joints pubescent on the edges;spikelets 2-flowered, or with a third rudi-mentary floret; glumes narrow, l-nerved,almost subulate, scabrous on the keel;lemma lanceolate, much-compressed, 5-nerved, ciliate with stiff hairs on the keeland exposed margin, unsymmetrical, theouter half broader and more distinctlynerved, the apex tapering into a straightawn about an inch long. 268. Hordeum L.—Barley. A small genus of temper-ate regions. Glumes narrow or subulate, standing in frontof the spikelet, the 3 pairs forming a sort of involucre ateach node of the rachis; lemmas awned. The most impor-tant species is the cultivated barley {H. vulgare), anannual with close spikes like those of wheat, the spikelets. Fig. 61. Secale (head),X}^;spikelet, X2. HORDED 245 long-awned. When all 3 spikelets of each group arc fertilethe barley is 6-rowed; whenonly the central spikelet isfertile the barley is 4-rowed, or commonbarley, all the spikelets arefertile but the lateral rowsof the opposite sides of thehead overlap or intermingleto form a single row. Sev-eral species of Hordeumare troublesome weeds. Ofthese may be mentioned Nutt., an annual,and H. nodosum L., a per-ennial, low short-awnedspecies found widely distrib-uted in the United States,and (squirrel-tail grass) with long-awnedsoft spikes, a perennialfound especially westward,all 3 native species. Twospecies introduced fromEurope, H. murinum L. andH. Gussoneanum Pari., vari-ously knoAvn as fox-tail andwild barley, are commonand troublesome on thePacific coast. These are lowspreading annuals, the


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Keywords: ., bookauthorhi, bookcentury1900, bookdecade1910, booksubjectgrasses