Leaf sheaths loose, strongly compressed, keeled, basal sheaths imbricate; leaf blades broadly linear to lanceolate, flat or folded, 5–20 × 0.6–1.2 cm, glabrous or adaxial surface pilose, apex obtuse; ligule 0.3–0.5 mm. Racemes 2–5, digitate or subdigitate, 4–10 cm, only slightly diverging; rachis glabrous. Spikelets oblong-lanceolate, 2–2.7 mm, pilose or glabrous, apex acute; upper glume and lower lemma 2–4-veined, midvein absent, laterals marginal; upper lemma pale, oblong-elliptic, shorter than spikelet, obtuse with an apical tuft of hairs; stigmas pale.

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On conic optimization, we work over some properties of cone and its dual cone, and solve the relations between special cones (obtuse cone, orthogonal cone, superior and inferior obtuse cones) and their dual cones.Furthermore, sufficient and necessary condition under which they exist are proved detailed .

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An obtuse angle is greater than a right angle: an obtuse angle of 100*.

這種觀看的方式需要一個100度的角度來閱讀的。

Obtuse triangle: One of the three angles is an obtuse angle.

銳角三角形：有一個角是鈍角在线性国日韩，有兩個角是銳角啪啪啪黄色网站。

Triangle with one obtuse angle is called obtuse angle triangle.

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Leaves with narrow ultimate segments 2–5 mm broad, hirtellous along the margins, lobes round, obtuse; primary umbel overtopped by laterals; bracteoles oblong to obovate, entire to 3-lobed at apex, lobes obtuse; petals white; fruit 4–5 mm.

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Spikelets with 2–7 florets; rachilla thick, disarticulating below each floret; glumes shorter than lemmas, 1–3-veined, cartilaginous in lower part, apex obtuse or acute; lemmas oblong to ovate, subcartilaginous, 3–5-veined, glabrous, strongly keeled above middle, apex obtuse; palea as long as lemma, scabrid along keel.

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Petiole 3-5 mm; leaf blade ovate, elliptic, or obovate, 3-5 × 2-3 cm,± leathery, base obtuse, apex obtuse, apiculate, mucronulate, or sometimes emarginate; secondary veins 3-5 on each side of midvein.

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Leaves alternate; petiole 1.5-2.5 mm, densely white tomentose; leaf blade adaxially light green, elliptic, lanceolate, or ovate-oblong, small, narrow, 1-2 cm × 5-8 mm, stiffly papery, abaxially densely and persistently gray-white tomentose, adaxially glabrous or sparsely white pubescent, lateral veins 4-6 pairs, midvein prominent abaxially, inconspicuous adaxially, base obtuse, margin serrulate, apex obtuse or acute, rarely rounded, often long mucronulate. Flowers yellow-green, sessile, gray-white pubescent, usually in terminal and axillary spicate panicles; rachis 1-2 cm, densely gray-white pubescent.

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Spikelets green, ovate to obovate, plumply plano-convex, 2.5–3.5 mm, smooth, shining, obtuse; upper glume cartilaginous, 3-veined, glabrous; lower lemma resembling upper glume but slightly shorter; upper lemma pale green, slightly shorter than spikelet, finely striate, obtuse.

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