. Bulletin. Gramineae -- United States; Forage plants -- United States. 24 This plant, lias been referred to the South American TrisUtdii/a leiostachya Nees, from which it is readily distinguished by its more slender habit, plane, not involute leaves, and shorter spikelets and awns. The spikelets of T. leiosiachya are 5 cm. long and the awns are about 12 cm. long. In T. avenacea the spikelets are from 2 to cm. long and the awns do not exceed 6 cm. in length. Near Santa Teresa, Sierra ]Madre Mountains, Territorio de Tepic, 2229 J. N. Eose, August 13, 1897. TRISTACHYA LAXA Scribn. & Merr
. Bulletin. Gramineae -- United States; Forage plants -- United States. 24 This plant, lias been referred to the South American TrisUtdii/a leiostachya Nees, from which it is readily distinguished by its more slender habit, plane, not involute leaves, and shorter spikelets and awns. The spikelets of T. leiosiachya are 5 cm. long and the awns are about 12 cm. long. In T. avenacea the spikelets are from 2 to cm. long and the awns do not exceed 6 cm. in length. Near Santa Teresa, Sierra ]Madre Mountains, Territorio de Tepic, 2229 J. N. Eose, August 13, 1897. TRISTACHYA LAXA Scribn. & Merrill, sp. nov. (Fig. 7.) A stout, erect perennial, 15 to 20 dm. high, with long leaves, scabrous spikelets, and . very lax panicles 4 to 5 dm. in length. Culms rigid, glabrous, al>out 1 cm. in diameter at the base; nodes smooth; sheaths striate, the lower ones numerous, imbricate, sparingly pubescent, the upper scabrous; ligule a dense ciliate fringe of soft liairs aljout 2 mm. long; leaf-blades involute or folded below, plane aljove, 4 to 7 dm. long, 5 to 10 mm. wide, glabrous beneath, sca- brous on the upper sur- face and margins, some- what bearded at the throat. Panicle very lax, the lower portion somewhat inclosed by the upper sheath; rachis smooth; branches alter- nate, the lower ones in clusters of twos at each node, solitary above, somewhat pubescent at the axils, very slender, the lower ones 2 dm. long, simple or once branched above the middle. Spikelets short-pedicellate, in clusters of threes at the end of the branches, to 2 cm. long; empty glumes purple, 3-nerved, acute, the first slightly shorter than the second, strongly scabrous on the keel and lateral nerves, slightly scabrous on the margins; third glume nearly equaling and inclosed by the first glume, 5-nerved, subtending a hyaline palea nearly its own length and a stami- nate flower, flowering glume 8 to 9 mm. long, 9-nerved, pubescent throughout with spreading white hairs, apex cleft, forming 2 acute te
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectforageplantsunitedst
