大姚老鸛草

大姚老鸛草

原圖鏈接 來自植物標本館

中文學名:大姚老鸛草 拉丁學名:Geranium christensenianum 別 稱:腺毛老鸛草 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:牻牛兒苗目 科:牻牛兒苗科 屬:老鸛草屬 組:沼生組

大姚老鸛草（學名：Geranium christensenianum）是牻牛兒苗科老鸛草屬的植物，為中國的特有植物。分布在中國大陸的雲南等地，生長於海拔2,300米至2,800米的地區，見於林下、灌叢和向陽山坡，目前尚未由人工引種栽培。

目錄

大姚老鸛草形態特徵

多年生草本，高30-80厘米。根莖斜生，具多數纖維狀根。莖仰臥或基部斜上升。不分枝或下部分枝，密被倒向短柔毛和開展的腺毛。

基生葉較小，早枯，莖生葉互生；托葉卵狀披針形，長10-12毫米，寬2-4毫米，外被長柔毛；莖生葉具長柄，柄長為葉片的2-3倍，密被短柔毛和開展的腺毛，上部葉柄短小；葉片三角形或近五角形，長2-3厘米，寬3-4厘米，3-5深裂近基部，裂片菱形，下部寬楔形，上部羽狀齒裂，小裂片寬牙齒狀，先端急狹，表面被伏毛，背面被短柔毛和沿脈被密毛。

原圖鏈接 來自植物標本館

花序腋生於上部葉腋和頂生，稍長於葉，密被開展的腺毛，總花梗具2花；苞片披針狀鑽形，長4-5毫米；花梗稍短於葉，密被開展腺毛；萼片卵狀橢圓形或橢圓狀披針形，長9-11毫米，寬2.5-3.5毫米，先端具長約2毫米的尖頭，外被柔毛和開展腺毛；花瓣白色，具紫色脈紋，倒長卵形，長為萼片的1.5-2倍或等長，花絲和花葯暗紫色，花絲下部擴展，被硫長柔毛；子房密被糙毛，花柱分枝紫黑色。

蒴果長約3厘米，被短柔毛和開展的腺毛。種子腎圓形，長約3厘米，寬約1.5厘米，具密細網紋。花期7-8月，果期9-10月。

Geranium christensenianum Hand. -Mazz. Symb. Sin. 7: 621. 1933; 雲南植物志5: 90. 1991.

Perennials. Rootstock 5-6 mm in diam., not tuberculate, with many fibrous roots. Stem 48-100 cm tall, trailing, rooting at nodes, with 0.3-1.3 mm patent nonglandular trichomes and 0.5-1.1 mm patent glandular trichomes. Stipules lanceolate, distinct. Leaves opposite; petiole with 0.2-1 mm patent nonglandular trichomes and 0.2-1.4 mm patent glandular trichomes; leaf blade 3.9-5.3 cm, palmately cleft, ratio of main sinus/middle segment length = 0.72-0.78, pilose with appressed nonglandular trichomes and ± patent glandular trichomes; segments 3(or 5), rhombic, 8.6-10.7 mm wide at base, 5-13-lobed in distal half, ratio of second sinus/middle segment length = 0.15-0.21. Cymules solitary, 2-flowered; peduncle 2.1-15.3 cm. Pedicel 0.8-1.7 cm, with 0.2-0.6 mm patent nonglandular trichomes and 0.3-1.2 mm patent glandular trichomes; bracteoles lanceolate. Sepals 0.8-1.2 cm, mucro 1.6-2.7 mm, ratio of mucro/sepal length = 0.18-0.22, outside with 0.2-0.8 mm antrorse to patent nonglandular trichomes and 0.5-1.6 mm ± patent glandular trichomes, inside glabrous. Petals whitish with fine dark purple veins, 1.2-1.4(-1.6) cm, erect to patent, outside basally with trichomes, margin basally ciliate, apex rounded. Staminal filaments blackish except base, lanceolate, abaxially densely covered with 0.2-0.8 mm trichomes but glabrous toward tip; anthers black, 2.1-2.5 mm. Nectaries 5, hemispheric, abaxially glabrous, apex with a tuft of trichomes. Stigma blackish. Fruit ca. 3.2 cm, erect when immature; mericarps smooth, with a basal callus, with 0.3-1 mm ± patent nonglandular trichomes and 0.6-1.5 mm patent glandular trichomes; rostrum 2.1-2.2 cm, with a 4-5 mm narrowed apex; stigmatic remains 5.9-6.2 mm. Seeds unknown. Fl. Jul-Aug, fr. Sep-Oct.

大姚老鸛草生長環境

生於海拔2 300-2 800米的林下、灌叢和向陽山坡。

大姚老鸛草分布範圍

分布於雲南（大姚、東川、玉溪）。