卵小叶垫柳查看源代码讨论查看历史
卵小叶垫柳 |
中文名:卵小叶垫柳 学 名:Salix ovatomicrophylla 界:植物界 门:被子植物门Angiospermae 纲:双子叶植物纲Dicotyledoneae 亚 纲:原始花被亚纲 Archichlamydeae 目:杨柳目 Salicales 科:杨柳科Salicaceae 属:柳属Salix 组:青藏垫柳组 Sect. Lindleyanae 种:卵小叶垫柳 |
卵小叶垫柳(学名:Salix ovatomicrophylla)是双子叶植物纲杨柳科柳属的植物。分布在尼泊尔以及中国大陆的云南、西藏、四川等地,生长于海拔4,200米至4,700米的地区,多生在高山灌丛,目前尚未由人工引种栽培。 [1]
卵小叶垫柳形态特征
垫状灌木,主千沿地表横走而生根,暗褐色。幼枝红褐色,无毛或近无毛。芽小,无毛。
叶极小,密集生长,覆盖整个枝条,卵形或卵状椭圆形、椭圆形或长圆形,长达2-4毫米,宽1-2毫米,先端钝或急尖,基部宽楔形或近圆形,上面绿色,无毛,中脉明显凹下,下面色较淡,初有毛,中脉明显隆起,全缘,稀叶缘上部有很疏的腺锯齿,中下部全缘;叶柄长仅1-2毫米。
花序与叶同时开放,生于当年生枝的顶端,基部具有正常叶片,軕有微毛;雄花序头状,长约6毫米,仅有数朵花;雄蕊2,花丝无毛或仅基部稍有毛,花药卵圆形;苞片椭圆形,仅内面基部散生短柔毛;具腹腺和背腺,腺体圆柱形,近等长,长为苞片的1/3,有时背腺先端分裂;
子房长卵形,具短柄,无毛,约与苞片等长,花柱明显,2裂,柱头2裂;苞片倒卵形,长约2毫米,先端圆形或微凹,黄绿色,无毛;仅具腹腺,细圆柱形,约与子房柄近等长。
蒴果卵形,光滑无毛。花期6月,果期7-8月。 [2]
Salix ovatomicrophylla Hao in Fedde,Rep. Beih. 93: 53. t. 8: 15. 1936. ——S. brachista auct. non Schneid.: Hand.-Mazz. Symb. Sin. 7: 85. 1929.——S. acuminatomicrophylla Hao in 1. c. 93: 43. t. 8: 16.1936; 西藏植物名录, 44. 1980.
Shrubs cushion-shaped, creeping; trunk dull brown. Young branchlets russet, glabrous or subglabrous. Buds small, glabrous. Leaves very small, crowded, covering branchlets; petiole 1-2 mm; leaf blade ovate or ovate-elliptic, elliptic, or oblong, usually 2-4 × 1-2 mm, abaxially greenish, at first pilose, glabrescent, adaxially green, glabrous, base broadly cuneate or subrounded, margin entire, rarely remotely dentate distally, apex obtuse or acute; midvein conspicuously raised abaxially, impressed adaxially. Flowering coetaneous. Catkins terminal. Male catkin capitate, ca. 6 mm; bracts elliptic, adaxially sparsely pubescent. Male flower: adaxial and abaxial glands cylindric, sometimes divided, ca. 1/3 as long as bracts; stamens 2; filaments glabrous or pilose at base; anthers ovoid. Female catkin bracts yellow, obovate, ca. 2 mm, apex rounded, or retuse. Female flower: gland adaxial, terete, nearly as long as stipe; ovary long ovoid, glabrous, shortly stipitate; style conspicuous, 2-cleft; stigma 2-lobed. Capsule ovoid, glabrous. Fl. Jun, fr. Jul-Aug.
卵小叶垫柳生长环境
主要生长于海拔4200-4700米的高山灌丛中或裸露岩石上。
卵小叶垫柳分布范围
主要分布于中国四川西部、云南西北部及西藏东部。分布于尼泊尔。模式标本采自云南丽江(玉龙山)。