叉柱柳檢視原始碼討論檢視歷史
叉柱柳 |
中文名:叉柱柳 學 名:Salix divergentistyla 界:植物界 門:被子植物門Angiospermae 綱:雙子葉植物綱Monocotyledoneae 亞 綱:原始花被亞綱 Archichlamydeae 目:楊柳目 Salicales 科:楊柳科Salicaceae 屬:柳屬Salix 組:裸柱頭柳組Sect.Psilostigmatae 種:叉柱柳 |
叉柱柳(學名:Salix divergentistyla)是楊柳科柳屬的植物,為中國的特有植物。分布在中國大陸的西藏等地,生長於海拔3,400米的地區,多生長于山坡或山谷潮濕處,目前尚未由人工引種栽培。 [1]
叉柱柳形態特徵
灌木或小喬木。一年生和當年生小枝無毛,棕褐色。葉狹橢圓形,長3-4.5厘米,寬1.3-1.6厘米,兩端銳尖,上面綠色,葉脈下陷,無毛,下面淺綠色,葉脈明顯高起,側脈9-12對,被長柔毛,後無毛或近無毛,全緣;葉柄長約6毫米。
僅見果序,長3.5-5.5厘米,粗約1厘米,有長花序梗,其上着生2-3葉,果序軸有柔毛;子房(果序中未發育的)卵形,長2.5毫米,無柄,密被柔毛,花柱長,近2全裂,呈叉狀,柱頭舌狀,2裂;
苞片寬橢圓形或寬長圓形,先端近圓形或圓截形,或微缺,外面中下部有柔毛,內面無毛,稍有緣毛,與子房等長,僅有腹腺,卵形或方形,先端分裂或不裂。
蒴果,長5毫米,有毛。 [2]
Salix divergentistyla C. F. Fang,植物分類學報, 17 (4): 108. 圖6: 8-11. 1979; 西藏植物名錄, 46. 1980.
Shrubs or small trees. Branchlets brownish red, glabrous. Petiole ca. 6 mm; leaf blade narrowly elliptic, 3-4.5 × 1.3-1.6 cm, abaxially greenish, villous, glabrescent or subglabrous, adaxially green, with impressed veins, glabrous, both ends sharply pointed, margin entire; lateral veins 9-12 each side of abaxially raised midvein; all veins impressed adaxially. Male catkin unknown. Fruiting catkin 3.5-5.5 × ca. 1 cm; peduncle long, with 2 or 3 leaflets; rachis pubescent; bracts broadly elliptic or broadly oblong, ca. as long as ovary, abaxially downy proximally, adaxially glabrous, slightly ciliate, apex subrounded, rounded-truncate, or retuse. Female flower: gland adaxial, ovate or rectangular, entire or divided; ovary ovoid, ca. 2.5 mm, densely downy, sessile; style long, nearly divided, divergent; stigma 2-cleft. Capsule ca. 5 mm, pilose.
- Mountain slopes, valleys; circa 3400 m. E Xizang (Zayü Xian).
叉柱柳生長環境
生長於海拔3400米的山坡或山谷潮濕處。