玫瑰紫草沙蚕

玫瑰紫草沙蚕
来自植物智的图片

中文名:玫瑰紫草沙蚕界:植物界门:被子植物门纲:单子叶植物纲目:禾本目科:禾本科亚科:画眉草亚科族:画眉草族亚族:三齿稃亚族属:草沙蚕属中文学名:Tripogon purpurascens Duthie

玫瑰紫草沙蚕(méi guī zǐ cǎo shā cán)，学名 Tripogon purpurascens Duthie，异名：Tripogon jacquemontii var. submuticus ，多年生植物。穗带玫瑰紫色。主要分布于喜马拉雅山南坡。 ^[1]

玫瑰紫草沙蚕形态特征

多年生。秆高约10厘米。叶鞘通常无毛，但鞘口具白色长柔毛；叶舌极短，呈纤毛状；叶片内卷如针，长1-5厘米，宽约1毫米，上面疏生白色柔毛。

穗状花序长2-6厘米，宽约1毫米；小穗通常带玫瑰紫色，长约5毫米，有2-3小花；颖草质，边缘带膜质，第一颖具1脉，长约3.5毫米，第二颖具3脉，侧膜常不明显，长约4毫米；

外稃主脉及侧脉均延伸呈长约0.5毫米的短尖头，第一外稃长2.5-3毫米。花药长1.5-2毫米。花果期7-9月。

Culms 5–35 cm tall. Basal leaf sheaths finally splitting into dense clumps of fibers; leaf blades 1–10 × 0.1–0.3 cm, adaxial surface densely scabrid-hispidulous, loosely pilose with long scattered hairs, abaxial surface glabrous. Racemes 2–10 (–17) cm, stiff, straight or slightly curved, spikelets tightly appressed to concavities in rachis, imbricate by 1/4–1/3 their length.

Spikelets 4–7 mm, usually purplish; florets 2–4(–6), imbricate, rachilla mostly hidden; lower glume narrowly triangular, symmetrical, 1.5–2.5 mm, acuminate; upper glume narrowly oblong, 2.5–4.5 mm, thickened along midvein, margins broad, scarious, apex scabrid-apiculate; lemmas oblong-lanceolate, 2–3.4 mm to sinus, 2-dentate, midvein produced into a 0.2–0.5 mm mucro, teeth rounded, lateral veins not extended; palea keels wingless, scabrid. Anthers 3, 1.2–2 mm. Fl. and fr. Jul–Sep.

Arid places, especially open stony mountainsides, sometimes forming a sward; 700–2400 m. Xinjiang [Afghanistan, Bhutan, NW India, Nepal, Pakistan; SW Asia (Saudi Arabia, Yemen)].

This is the only species in China with a short mucro from the lemma tip not exceeding 0.5 mm, lateral veins not at all extended from the apical teeth, and wingless, scabrid palea keels. It was misidentified as Tripogon abyssinicus Nees ex Steudel in Fl. Brit. India (7: 287. 1896, "1897").

The name "Tripogon hookerianus Bor" (Grasses Burma, Ceylon, India, Pakistan, 522. 1960) belongs here, but was not validly published because no type was indicated.

分类文献

Tripogon purpurascens Duthie in Ann. Rov. Bot. Gds. Cal. 9: 75. 1901: Bot. Grass. Burm. Ceyl. Ind. Pakist. 522. 1960; Tzvel. Pl. As. Centr. 4:109. 1968: 新疆植物检索表1: 262. 1982. ——Tripogon jacquemontii Stapf var. submuticus Hook. f. Fl. Brit. Ind. 7: 287. 1896.——Tripogon abyssinicus auct. non Nees: Hook. f. l. c. 287. p. p.