截苞柳
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 |
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。