卵小葉墊柳
卵小葉墊柳 |
中文名:卵小葉墊柳 學 名:Salix ovatomicrophylla 界:植物界 門:被子植物門Angiospermae 綱:雙子葉植物綱Dicotyledoneae 亞 綱:原始花被亞綱 Archichlamydeae 目:楊柳目 Salicales 科:楊柳科Salicaceae 屬:柳屬Salix 組:青藏墊柳組 Sect. Lindleyanae 種:卵小葉墊柳 |
卵小葉墊柳(學名:Salix ovatomicrophylla)是雙子葉植物綱楊柳科柳屬的植物。分布在尼泊爾以及中國大陸的雲南、西藏、四川等地,生長於海拔4,200米至4,700米的地區,多生在高山灌叢,目前尚未由人工引種栽培。 [1]
目錄
卵小葉墊柳形態特徵
墊狀灌木,主千沿地表橫走而生根,暗褐色。幼枝紅褐色,無毛或近無毛。芽小,無毛。
葉極小,密集生長,覆蓋整個枝條,卵形或卵狀橢圓形、橢圓形或長圓形,長達2-4毫米,寬1-2毫米,先端鈍或急尖,基部寬楔形或近圓形,上面綠色,無毛,中脈明顯凹下,下面色較淡,初有毛,中脈明顯隆起,全緣,稀葉緣上部有很疏的腺鋸齒,中下部全緣;葉柄長僅1-2毫米。
花序與葉同時開放,生於當年生枝的頂端,基部具有正常葉片,軕有微毛;雄花序頭狀,長約6毫米,僅有數朵花;雄蕊2,花絲無毛或僅基部稍有毛,花葯卵圓形;苞片橢圓形,僅內面基部散生短柔毛;具腹腺和背腺,腺體圓柱形,近等長,長為苞片的1/3,有時背腺先端分裂;
子房長卵形,具短柄,無毛,約與苞片等長,花柱明顯,2裂,柱頭2裂;苞片倒卵形,長約2毫米,先端圓形或微凹,黃綠色,無毛;僅具腹腺,細圓柱形,約與子房柄近等長。
蒴果卵形,光滑無毛。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; 西藏植物名錄, 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.
卵小葉墊柳生長環境
主要生長於海拔4200-4700米的高山灌叢中或裸露岩石上。