A text-book of grasses with especial reference to the economic species of the United States . 1-sided, the pedicels thickened atthe apex; spikelets large, drooping, vari-able in size but usually about ^ to 1 inch long,the glumes strongly several - nerved, membra-naceous, acuminate, scabrous, containing usually2 florets, the lemmas smooth or slightly hairy atthe base, the teeth acute but not awned, thedorsal awn absent or, if present, usually straightand not much exceeding the glumes, often pre-sent only on the lower floret, the palea inclosedby the inrolled margin of the lemma, denselyshort-ci
A text-book of grasses with especial reference to the economic species of the United States . 1-sided, the pedicels thickened atthe apex; spikelets large, drooping, vari-able in size but usually about ^ to 1 inch long,the glumes strongly several - nerved, membra-naceous, acuminate, scabrous, containing usually2 florets, the lemmas smooth or slightly hairy atthe base, the teeth acute but not awned, thedorsal awn absent or, if present, usually straightand not much exceeding the glumes, often pre-sent only on the lower floret, the palea inclosedby the inrolled margin of the lemma, denselyshort-ciUate on the 2 keels. The floretsdo not easily disarticulate, a conditionprobably due to cultivation. Commonlycultivated and often escaped from fieldsand in the vicinity of elevators, mills,railroads and in waste places, but rarelyestablished permanently. There are sev-Fio. 43. Notholeuslanatus. era! races or possibly species in cultiva- Inflorescence X^s; spikelet, ^^^^ rpj^^ ^^^^^ ^^t {A. nuda L.) difiers the two florets raised from ^ the glumes, X7. in having more than 2 florets and in. AVENE^ 211 having the caryopsis loosely and not permanently inclosed in thenerved lemma. Avena fatua L. (Fig. 44). Wild oats. Differs from A. salivachiefly in the spikelet characters. Florets easily disarticulating, thelemma beset with stiff usually brown hairs,these more abundant at base, the teeth acuteas in ^. saliva, the dorsal awn well developed,over an inch long, geniculate, twisted at base,usually brown. A common weed on thePacific coast and occasional elsewhere. Avena fatua glabrataPeterm. Differs from A. fatuain having nearly or quite gla-brous lemmas. This form canbe distinguished from the usualforms of A. saliva by thestrong awn and by the easily disarticulatingspikelets. Avena barbata Brot. Differs from A. fatua inhaving more slender panicle branches and in theawned teeth of the lemma. A common weed onthe Pacific coast, and a constituent of the wildoats of that region. Avena steril
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Keywords: ., bookauthorhi, bookcentury1900, bookdecade1910, booksubjectgrasses
