錫金柳
錫金柳 |
中文名:錫金柳 學 名:Salix sikkimensis Anderss. 界:植物界 門:被子植物門 綱:雙子葉植物綱 目:楊柳目 科:楊柳科 屬:柳屬 種:錫金柳 |
錫金柳(xī jīn liǔ,學名 Salix sikkimensis Anderss.)是楊柳科柳屬的一種灌木,高1-2米。二年生的小枝粗,有棱,節明顯,暗紫紅色,光滑無毛,有光澤。葉橢圓形稀狹橢圓形,上面綠色。 本種尚未採到完全成熟的葉形標本。其花部構造與外形和雙柱柳S. bistyla Hand.-Mazz.近似,但本種先葉開花,花序側生,小枝上着生多數花序,無花序梗,基部無正常葉,幼葉下面網脈不明顯;而後者,花序生於枝端,一花枝上僅着生一個花序,其下部有正常葉,葉脈明顯。 [1]
目錄
錫金柳形態特徵
灌木,高1-2米。二年生的小枝粗,有棱,節明顯,暗紫紅色,光滑無毛,有光澤。
葉橢圓形稀狹橢圓形,上面綠色,無毛或脈上有柔毛,下面密被白色絹質伏生柔毛,有光澤,後稍脫落,全緣。
花序粗,無梗,先葉開放,稀近同時開放;雄花序長2-2.5厘米,粗約1.6厘米,雄蕊2;花葯橢圓形,外壁黃色或部分紅色,花絲2,離生,基部有柔毛,長約8毫米;
苞片近倒三角形,長4毫米,先端有牙齒,3脈明顯,外面密被白色長毛,內面近無毛;有背腺和腹腺;
雌花序長3.5-4.5(8)厘米,粗(1.3-)1.6厘米;子房圓錐狀卵形,長約3.5毫米,有短柄,有柔毛,花柱長,2深裂,柱頭不裂;苞片形狀同雄花,但較小;僅1腹腺。
花期6月上、中旬。 [2]
Salix sikkimensis Anderss. in DC. Prodr. 16 (2): 268. 1868; Schneid. in Sarg. Pl. Wils. 3: 115. 1916; Hao in Fedde, Rep. Beih. 93: 90. t. 33: 65. 1936; 西藏植物名錄, 49. 1980.
Shrubs to 1-2 m tall. Two-year-old branchlets stout, with conspicuous angles and nodes, dull purplish red, glabrous, smooth, shiny. Leaves very small at anthesis, mature leaves unknown; leaf blade elliptic, rarely narrowly elliptic, abaxially densely white sericeous-pubescent, appressed, shiny, glabrescent, adaxially green, glabrous or downy along veins, margin entire. Flowering precocious, rarely nearly coetaneous. Male catkin thick, 2-2.5 × ca. 1.6 cm, sessile; bracts nearly obdeltoid, ca. 4 mm, submembranous, abaxially with dense, long, white hairs, adaxially subglabrous, apex subtruncate, dentate, 3-veined. Male flower: glands adaxial and abaxial; stamens 2; filaments distinct, ca. 8 mm, base downy; anthers yellow or partly red, ellipsoid. Female catkin 3.5-4.5(-8) × 1.3-1.6 cm; bracts as in male catkin. Female flower: gland adaxial; ovary conical-ovoid, ca. 3.5 mm, downy, shortly stipitate; style long, 2-parted; stigma entire. Capsule unknown. Fl. Jun.
錫金柳生長環境
生長於海拔3700-4500米的河灘地及路旁。