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截苞柳

中文名:截苞柳

學 名:Salix resecta

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]]

組:綿毛柳組

種:截苞柳

分布區域:中國雲南四川

截苞柳(學名:Salix resecta)為楊柳科柳屬的植物。分布於中國大陸的雲南四川等地,生長於海拔2,800米至4,250米的地區,多生長在山谷濕地,目前尚未由人工引種栽培。 [1]

目錄

截苞柳形態特徵

灌木,高1-2米。小枝粗壯,常集生於干或大枝的上部,褐色或紫褐色,無毛,有光澤。

葉常集生在小枝的端部,長圓形或微倒卵狀橢圓形,長2-2.5 (-3.5)厘米,寬5-13 (-16)毫米,先端鈍或急尖,基部鈍,上面有疏柔毛,下面毛較多,蒼白色,全緣;葉柄短;上年的落葉發紅色。

花序多着生在枝端部,側生,有花序梗,具3-6個正常葉;雄花序長約3厘米,粗6-8毫米;雄蕊2,花葯金黃色,花絲離生,達中部以上有柔毛,長5毫米;苞片近圓形,先端截形或圓截形,少數微缺,約為花絲長的1/2,兩面及邊緣有柔毛,下部稍多;腺體2,背生和腹生;

雌花序長2-5.5厘米,粗4-7毫米;子房卵形至長卵形,無柄,密被白色或淡黃色柔毛,花柱長,2裂,柱頭2裂;苞片同雄花,通常只有1腹腺(個別花具有1小背腺),長約為苞片的1/3。

蒴果長約3毫米,有短柄。花期5月下旬,果期6月中下旬。[2]

Salix resecta Diels in. Nat. Bot. Gard. Edinb. 5: 281. 1912; Schneid. in Sarg. Pl. Wils. 3: 121. 1916; Hand.-Mazz. Symb. Sin. 7: 81. 1929; Hao in Fedde, Rep. Beih. 93: 95. t. 36: 71. 1936.

Shrubs to 2 m tall. Lateral branches usually together on distal part of trunk or main branches, brown or purplish brown, stout, glabrous, shiny. Leaves clustered at apex of branchlets; petiole short; leaf blade oblong or slightly obovate-elliptic, 2-2.5(-3.5) × 0.5-1.3(-1.6) cm, abaxially pale, downy, adaxially pilose, base obtuse, margin entire, apex obtuse or acute. Catkins lateral on distal part of branchlets. Male catkin ca. 3 cm × 6-8 mm; peduncle with 36 leaflets; bracts suborbicular to obovate-oblong, ca. 1/2 as long as filaments, downy, ciliate, apex truncate or rounded-truncate, rarely retuse. Male flower: glands adaxial and abaxial; stamens 2; filaments free, ca. 5 mm, downy nearly throughout; anthers golden yellow. Female catkin 2-5.5 cm × 4-7 mm; bracts obovate-oblong, nearly as long as ovary. Female flower: adaxial gland ca. 1/3 as long as bracts, abaxial gland rarely present and small; ovary ovoid to long ovoid,white or yellowish pubescent, sessile; style long, 2-cleft; stigma 2-lobed. Capsule ca. 3 mm; stipe short. Fl. May, fr. Jun.

截苞柳生長環境

生長於海拔2800-4250米的山谷濕地。

截苞柳分布範圍

產於雲南四川。模式標本采自雲南大理點蒼山

參考來源

  1. 截苞柳, 植物智, 2020-01-18
  2. 《中國植物志》 第20(2)卷 (1984) >> 264頁 PDF >> 截苞柳 Salix resecta