康定墊柳檢視原始碼討論檢視歷史
康定墊柳 |
中文名:康定墊柳 學 名:Salix kangdingensis 界:植物界 門:被子植物門 綱:雙子葉植物綱 亞 綱:原始花被亞綱 目:楊柳目 科:楊柳科 屬:柳屬 組:青藏墊柳組 種:墊柳 變 種:康定墊柳 |
康定墊柳(學名:Salix kangdingensis)是楊柳科、柳屬的一種木本植物,為中國的特有植物。分布於中國大陸的四川等地,生長於海拔3,000米的地區,見于山坡灌叢下,目前尚未由人工引種栽培。(圖像來源:國家標本平台) [1]
康定墊柳形態特徵
墊狀灌木,主幹匍匐,細長,不生根,紅褐色。當年生枝黃褐色,近於直立,高數厘米,密被白色長柔毛,後無毛。芽小,廣卵形,被稀疏短柔毛。
葉橢圓形或卵形,長約1.4厘米,寬約8毫米,先端急尖或稍鈍,基部闊楔形,上面綠色,幼時散生短柔毛,後無毛,中脈凹下,側脈微隆起,下面淡綠色,幼時沿中脈密生長柔毛,後無毛,葉脈明顯隆起呈網狀,全緣,稀有極不明顯的稀疏的腺鋸齒;葉柄長約3毫米,幼時被長柔毛。
雄花序與葉同時開放,細圓柱形,長約1.3厘米,粗約4毫米,生於當年枝的頂端,花序梗與花序近等長,生有3-5正常的小葉,軸密被長柔毛;
雄蕊2,長約2.5毫米,約為苞片的2倍,花絲下部有長柔毛,花葯長圓形,黃色;苞片橢圓形,先端圓形,外面近無毛,內面及邊緣有疏長柔毛;
腺體2, 紅色,腹腺和背腺皆為細圓柱形,近等長,約為苞片長的一半。
未見雌株。花期5月下旬。 [2]
Salix kangdingensis S. D. Zhao et C. F. Fang,東北林學院植物研究室彙刊, 9: 9. 1980.
Shrubs procumbent to 3 cm tall; trunk russet, slender. Juvenile branchlets suberect, yellowish brown, densely white villous, glabrescent. Buds broadly ovoid, small, pilose. Petiole ca. 3 mm; leaf blade elliptic or ovate, ca. 1.4 × 0.8 cm, abaxially greenish, densely villous along midvein, or glabrous, adaxially green, sparsely pilose when young, glabrescent, base broadly cuneate, margin entire, rarely indistinctly sparsely glandular serrate, apex acute or obtuse; reticulate veins conspicuously raised abaxially. Flowering coetaneous. Male catkin terminal, cylindric, ca. 1.3 cm × 4 mm; peduncle nearly equal to catkin, with 3-5 leaflets; rachis villous; bracts elliptic, abaxially subglabrous, adaxially sparsely villous and ciliate, apex rounded. Male flower: glands 2, red, thinly cylindric, ca. 1/2 as long as bracts; stamens 2, ca. 2.5 mm, ca. 3 × as long as bracts; filaments villous proximally; anthers yellow, oblong. Female catkin unknown. Fl. May.
- Thickets on mountain slopes; circa 3000 m. W Sichuan
Similar to Salix brachista but juvenile branchlets densely pubescent; leaf blade entire; male catkin slender; bracts sparsely villous and ciliate adaxially; glands thinly cylindric; filaments villous proximally.
本種與小墊柳S. brachista Schneid.相近,但當年生枝有密毛,葉全緣,花序較細而長,花絲下部約1/3具長柔毛;腺體較狹長;苞片內面及邊緣生有稀疏的長柔毛。
康定墊柳生長環境
康定墊柳生長於海拔約3000米的山坡灌叢下。