類四腺柳檢視原始碼討論檢視歷史
類四腺柳 |
中文名:類四腺柳 學 名:Salix paratetradenia C. Wang et P. Y. Fu 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 種:類四腺柳 |
類四腺柳,楊柳科柳屬的植物,為中國的特有植物。分布於中國大陸的西藏等地,生長於海拔2,500米至4,300米的地區,多生長在河流旁、泥石流的沙石灘上、山坡灌叢和林緣,目前尚未由人工引種栽培。 [1]
類四腺柳形態特徵
灌木,高可達5米。枝黑褐色或灰褐色,當年生枝有毛,老枝無毛。
葉長橢圓形,橢圓形或倒卵狀長橢圓形,長2.5-6厘米,寬1.5-2.5(3)厘米,先端圓形,稍尖)稀微凹,上面綠色,下面淡綠色或帶白色,兩面無毛,或僅中脈基部有柔毛,全緣;葉柄長2-9(15)毫米,被毛。
花與葉同時開放,花序梗短,有2-3小葉,軸有密長柔毛;雄花序長2.5-3.5(4)厘米,粗約6毫米;雄蕊2,花絲離生,下部有長柔毛;苞片倒卵形或近圓形,先端近圓形或有淺齒,黃綠色,外面有長毛或上部無毛,內面無毛或近無毛,邊緣有長毛;腺體2-(1),腹腺卵狀圓柱形,長約為苞片的1/2-2/3,背腺較小,或缺,雌花序長2.5-4厘米,粗4-6(7)毫米;
子房卵形或卵狀圓錐形,無毛或基部有毛,有短柄,花柱明顯,柱頭2裂;苞片與雄花同,腹腺1(2),與苞片近等長。
果序長達5.5厘米;蒴果無毛,長3毫米。花期4月下旬-5月上旬。 [2]
Salix paratetradenia C. Wang et P. Y. Fu,植物分類學報, 12: 202. 圖版9: 18. 1974;西藏植物名錄, 47. 1980.
Shrubs to 5 m tall. Branchlets blackish brown or grayish brown; juvenile branchlets pilose, glabrescent. Petiole 2-9(-15) mm, pilose; leaf blade oblong-elliptic, elliptic, long obovate-elliptic, or long elliptic-lanceolate, 2.5-6 × 1.5-2.5(-3) cm, abaxially greenish or whitish, adaxially green, both surfaces glabrous or downy at base of midvein, base rounded or attenuate, margin entire, apex rounded or slightly acute, rarely retuse. Flowering coetaneous. Catkins 2.5-3.5(-4) cm × 4-6 (-7) mm; peduncle short, with 2 or 3 leaflets; rachis villous; bracts yellowish green, obovate or suborbicular, abaxially villous or glabrous distally, adaxially glabrous or subglabrous, long ciliate, apex subrounded or shallowly dentate. Male flower: adaxial gland ovate-terete, 1/2 to ca. as long as bracts, abaxial gland smaller or absent; stamens 2; filaments free, villous proximally. Fruiting catkin to 5.5 cm. Female flower: adaxial gland 1(or 2), ca. as long as bracts; ovary ovoid or ovoid-conical, glabrous or pilose at base, shortly stipitate; style conspicuous; stigma 2-lobed. Capsule ca. 3 mm, glabrous. Fl. Apr-May, fr. Jun.
類四腺柳生長環境
生於海拔2500-4300米的河流旁或泥石流的沙石灘上,山坡灌叢或林緣。