玫瑰紫草沙蠶

玫瑰紫草沙蠶
來自植物智的圖片

中文名:玫瑰紫草沙蠶界:植物界門:被子植物門綱:單子葉植物綱目:禾本目科:禾本科亞科:畫眉草亞科族:畫眉草族亞族:三齒稃亞族屬:草沙蠶屬中文學名:Tripogon purpurascens Duthie

玫瑰紫草沙蠶(méi guī zǐ cǎo shā cán)，學名 Tripogon purpurascens Duthie，異名：Tripogon jacquemontii var. submuticus ，多年生植物。穗帶玫瑰紫色。主要分布於喜馬拉雅山南坡。 ^[1]

玫瑰紫草沙蠶形態特徵

多年生。稈高約10厘米。葉鞘通常無毛，但鞘口具白色長柔毛；葉舌極短，呈纖毛狀；葉片內卷如針，長1-5厘米，寬約1毫米，上面疏生白色柔毛。

穗狀花序長2-6厘米，寬約1毫米；小穗通常帶玫瑰紫色，長約5毫米，有2-3小花；穎草質，邊緣帶膜質，第一穎具1脈，長約3.5毫米，第二穎具3脈，側膜常不明顯，長約4毫米；

外稃主脈及側脈均延伸呈長約0.5毫米的短尖頭，第一外稃長2.5-3毫米。花葯長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.

分類文獻

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: 新疆植物檢索表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.