西藏柳
西藏柳 |
中文名:西藏柳 学 名:Salix xizangensis Y. L. Chou 界:植物界 门:被子植物门Angiospermae 纲:双子叶植物纲Dicotyledoneae 目:杨柳目 Salicales 科:杨柳科Salicaceae 属:柳属Salix 种:西藏柳 分布区域:中国西藏 |
西藏柳(xī zàng liǔ,学名 Salix xizangensis Y. L. Chou),本种与丝毛柳S. luctuosa Levl. 相近,其主要区别为:植株较矮,叶较大,下面无绢状柔毛;雌花序较短,长1.4-1.6厘米,不及3厘米;子房有短柄,下部有疏长毛;腺体长。 [1]
目录
西藏柳形态特征
灌木,高约50厘米。小枝暗灰绿褐色,幼时有毛,后无毛。叶长圆形或椭圆形,长2-3厘米,宽9-11毫米,两端钝,少近圆头,上面深绿色,无毛,中脉有短柔毛,下面灰白色,无毛,有时中脉基部有毛,全缘; 叶柄长2-4毫米,有短柔毛,稀为疏毛。
雌花序与叶同时开放,较短而细,长1.4-1.6厘米,粗3-4毫米,有花序梗,长4-5毫米,有短柔毛,具2-3小叶;子房长圆状卵形,下部有疏柔毛,有短柄,花柱短,上部2裂,柱头2裂;
苞片椭圆形,长约为子房的1/2,圆头,两面有疏长毛;腺体1,腹生,条形,较长,稍短于苞片。花期7月。 [2]
Salix xizangensis Y. L. Chou, 植物分类学报, 17 (4): 105. 图4: 3-4. 1979; 西藏植物名录, 49. 1980.
Shrubs erect, to 50 cm tall. Branchlets dull gray or greenish brown; young branchlets pilose, glabrescent. Petiole 2-4 mm, pubescent, rarely pilose; leaf blade oblong or elliptic, 2-3 × 0.9-1.1 cm, adaxially dull green, sometimes pilose at base of midvein, both ends obtuse, rarely subrounded, margin entire. Flowering coetaneous. Male catkin unknown. Female catkin 1.4-1.6 cm × 3-4 mm; peduncle 4-5 mm, pubescent, with 2 or 3 leaflets; bracts elliptic, ca. 1/2 as long as ovary, both surfaces sparsely long pubescent, apex rounded. Female flower: adaxial gland shortly linear, slender, slightly shorter than bracts; ovary oblong-ovoid, basally pilose, shortly stipitate; style short, 2-cleft; stigma 2-lobed. Fl. Jul.
- Thickets on high mountains; circa 4000 m. Xizang
Similar to Salix luctuosa but plants smaller; leaf blade larger, not silky downy abaxially; female catkin 1.4-1.6 cm; bracts sparsely long pubescent; adaxial gland slender; ovary shortly stipitate.
西藏柳生长环境
主要生长于海拔4000米的高山灌丛中。