墊狀虎耳草
墊狀虎耳草 |
中文名:墊狀虎耳草 拉丁學名:Saxifraga pulvinaria 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:薔薇目 亞 目:虎耳草亞目 科:虎耳草科 亞 科:虎耳草亞科 族:虎耳草族 屬:虎耳草屬 亞 屬:山羊臭亞屬 組:舌形組 亞 組:對葉亞組 系:具緣系 |
墊狀虎耳草(diàn zhuàng hǔ ěr cǎo,學名:Saxifraga pulvinaria)為虎耳草科虎耳草屬下的一個種。產於貢山、香格里拉;分布於西藏。 [1]
目錄
墊狀虎耳草形態特徵
多年生墊狀草本,極密集叢生,高2-5厘米。主根粗約1毫米,具多數細側根和纖維狀鬚根。
莖稈短,具極多數分枝,分枝密生覆瓦狀排列的葉,呈圓柱形;花莖長1.4-2毫米,埋藏於葉叢中,無毛,生3-4葉。莖稈的葉肉質,倒卵狀長圓形,長2-4毫米,寬1-1.5毫米;
先端鈍並稍反折,具1分泌鈣質的小窩孔,表面凹,背面稍龍骨狀,兩面均無毛,邊緣下部具緣毛;花莖的葉線狀長圓形,長3.5-4毫米,寬約1毫米,先端急尖,具1分泌鈣質的小窩孔,兩面無毛,邊緣下部具緣毛。
花單個頂生,輻射對稱;萼片5,在花期近直立,卵形至寬卵形,長1.8-2毫米,寬1-1.4毫米,先端鈍,兩面無毛,邊緣生短腺毛,3-5脈於中脈的先端匯合成1小疣點;
花瓣5,白色,倒卵形或長圓狀倒卵形,長4-5毫米,寬2-3毫米,先端圓,上部開展,基部漸狹成短爪,3-6脈,側脈出於中脈下部;雄蕊10,超出花萼,花絲鑽形,花葯藍紫色;
子房半下位,2心皮下部合生,花柱短,柱頭小。花果期6-9月 。[2]
Saxifraga pulvinaria H. Smith in Bull. Brit. Mus. Bot. 2(4) : 105. f. 4m-o. 1958; Hara et Williams, Enum. Flow. Pl. Nepal 2: 154. 1979;雲南種子植物名錄上冊: 244. 1984; 西藏植物志 2: 510. 圖168: 22-25. 1985. ——S. imbricata Royle, Illustr. Bot. Himal. 226. t. 49. f. 1. 1835, non Lam. 1778; Clarke in Hook. f. Fl. Brit. Ind. 2: 394. 1878: Engl. et Irmsch. in Engl. pflanzenr. 69(IV. 117): 573. f. 120. 1919; Hand. -Mazz. Symb. Sin. 7(2) : 425. 1931. Saxifraga imbricata Royle, Ill. Bot. Himal. Mts. 1: 226. 1835, not Lamarck (1779), nor Bertoloni (1830).
Plants many branched, 4.5-6 cm tall, with crowded shoots forming cushions. Flowering stem embedded among rosette leaves and not visible, 1.4-1.9 mm, glabrous. Shoot leaves imbricate, aggregated into a rosette, narrowly elliptic, ca. 3.3 × 1.4 mm, leathery, both surfaces glabrous, chalk gland 1, margin cartilaginous ciliate, apex acute, glabrous. Cauline leaves 3 or 4, linear-oblong, 3.5-4 × 0.8-1 mm, both surfaces glabrous, chalk gland 1, margin cartilaginous ciliate, apex acute, glabrous. Flower solitary; bract suboblong, ca. 2.8 × 0.9 mm, both surfaces glabrous, margin glandular ciliate, apex acute; pedicel ca. 0.3 mm. Sepals erect, subtriangular-ovate to broadly ovate, 1.6-2 × ca. 1.4 mm, leathery, both surfaces glabrous, veins 3, confluent at apex, margin glandular ciliate, apex obtuse or acute, glabrous. Petals white, obovate or oblanceolate to oblong, 3.5-5.3 × (1.5-)2-3 mm, 5- or 6-veined, base gradually narrowed into a claw, apex retuse or obtuse. Stamens ca. 2.2 mm. Ovary subinferior, ca. 2 mm, with an annular nectary disc; styles ca. 1.5 mm. Fl. Jun-Jul.
Rock crevices; 3900-5200 m. SW Xinjiang (Taxkorgan Tajik Zizhixian), SW Xizang (Burang Xian), NW Yunnan (Gongshan Drung-Nu Zu Zizhixian, Zhongdian Xian) [Bhutan, India, Kashmir, Nepal, Sikkim].
墊狀虎耳草生長環境
生長於海拔3900米左右的岩石隙。[3]