怒江矮柳
怒江矮柳 |
中文名:怒江矮柳 學 名:Salix coggygria Hand.-Mazz. 界:植物界 門:被子植物門Angiospermae 綱:雙子葉植物綱Monocotyledoneae 目:楊柳目 Salicales 科:楊柳科Salicaceae 屬:柳屬Salix 種:矮柳 變 種:怒江矮柳 |
怒江矮柳(nù jiāng ǎi liǔ,學名 Salix coggygria Hand.-Mazz.),矮小灌木,高可達50厘米。幼枝褐色,老枝暗褐色;當年生枝被灰色或褐色絨毛,後無毛。產於雲南西北部、西藏東部。 [1]
目錄
怒江矮柳形態特徵
矮小灌木,高可達50厘米。幼枝褐色,老枝暗褐色;當年生枝被灰色或褐色絨毛,後無毛。
芽卵形,褐色,長4-7毫米,被微毛。葉倒卵圓形,長1.5-4.5厘米,寬1.5-3.5厘米,兩端鈍圓,先端常有一皺褶,上面綠色,被散生短柔毛,下面蒼白色,有蠟粉,幼葉上面密被銹色柔毛,下面密被白色長柔毛,後變無毛,全緣,稀在近先端處有疏鋸齒;葉柄長2-5毫米,有密毛;托葉三角狀卵形,有毛。
花序與葉同時展開,長2-3厘米,密花,生於當年生枝頂端,基部有數枚正常或較小的小葉,花序軸密被絨毛;雄蕊2,長6毫米,花絲中部以下有毛,花葯卵球形,黃色;
苞片倒卵狀長圓形,長約3毫米,先端鈍或近截形,兩面有疏柔毛,邊緣較密;
腺體2,腹生和背生,圓柱形;子房卵形,無柄,密被灰白色氈毛,花柱明顯,先端2裂,柱頭2裂。花期6月,果期7月。 [2]
Salix coggygria Hand.-Mazz. Symb. Sin. 7: 79. t. 1: 5-6. 1929; Hao in Fedde, Rep. Beih. 93: 57. t. 11: 21. 1936; 西藏植物名錄, 45. 1980.
Shrubs low, to 50 cm tall. Branchlets dull brown, glabrous, when young gray or brownish tomentose. Buds brown, ovoid, 4-7 mm. Stipules deltoid-ovate, pilose; petiole 2-5 mm, with dense hairs; leaf blade obovate-orbicular, 1.5-4.5 × 1.5-3.5 cm, abaxially pale, glaucous, adaxially green, when young densely white villous abaxially, glabrescent, adaxially densely rust-colored pubescent, both ends obtuse-rounded, margin entire, rarely sparsely serrate near apex, apex often with a pleated mucro. Flowering coetaneous. Catkins terminal, 2-3 cm, densely flowered, with leaflets at base; rachis tomentose; bracts obovate-oblong, ca. 3 mm, pilose, apex obtuse or subtruncate. Male flower: adaxial and abaxial glands cylindric; stamens 2, ca. 6 mm; filaments pilose proximally; anthers yellow, ovoid. Female flower: ovary ovoid, densely grayish white pubescent, sessile; style 2-cleft; stigma 2-lobed. Fl. Jun, fr. Jul.
- Among shrubs; 3400-4700 m. E Xizang, NW Yunnan
怒江矮柳生長環境
生長於海拔3400-4700米的高山地區,常與其他灌木形成高山灌叢。