西藏柳檢視原始碼討論檢視歷史
西藏柳 |
中文名:西藏柳 學 名:Salix xizangensis Y. L. Chou 界:植物界 門:被子植物門Angiospermae 綱:雙子葉植物綱Dicotyledoneae 目:楊柳目 Salicales 科:楊柳科Salicaceae 屬:柳屬Salix 種:西藏柳 分布區域:中國西藏 |
西藏柳(xī zàng liǔ,學名 Salix xizangensis Y. L. Chou),本種與絲毛柳S. luctuosa Levl. 相近,其主要區別為:植株較矮,葉較大,下面無絹狀柔毛;雌花序較短,長1.4-1.6厘米,不及3厘米;子房有短柄,下部有疏長毛;腺體長。 [1]
西藏柳形態特徵
灌木,高約50厘米。小枝暗灰綠褐色,幼時有毛,後無毛。葉長圓形或橢圓形,長2-3厘米,寬9-11毫米,兩端鈍,少近圓頭,上面深綠色,無毛,中脈有短柔毛,下面灰白色,無毛,有時中脈基部有毛,全緣; 葉柄長2-4毫米,有短柔毛,稀為疏毛。
雌花序與葉同時開放,較短而細,長1.4-1.6厘米,粗3-4毫米,有花序梗,長4-5毫米,有短柔毛,具2-3小葉;子房長圓狀卵形,下部有疏柔毛,有短柄,花柱短,上部2裂,柱頭2裂;
苞片橢圓形,長約為子房的1/2,圓頭,兩面有疏長毛;腺體1,腹生,條形,較長,稍短於苞片。花期7月。 [2]
Salix xizangensis Y. L. Chou, 植物分類學報, 17 (4): 105. 圖4: 3-4. 1979; 西藏植物名錄, 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.
西藏柳生長環境
主要生長於海拔4000米的高山灌叢中。