大姚老鹳草

大姚老鹳草

原图链接 来自植物标本馆

中文学名:大姚老鹳草 拉丁学名:Geranium christensenianum 别 称:腺毛老鹳草 界:植物界 门:被子植物门 纲:双子叶植物纲 亚 纲:原始花被亚纲 目:牻牛儿苗目 科:牻牛儿苗科 属:老鹳草属 组:沼生组

大姚老鹳草（学名：Geranium christensenianum）是牻牛儿苗科老鹳草属的植物，为中国的特有植物。分布在中国大陆的云南等地，生长于海拔2,300米至2,800米的地区，见于林下、灌丛和向阳山坡，目前尚未由人工引种栽培。

目录

大姚老鹳草形态特征

多年生草本，高30-80厘米。根茎斜生，具多数纤维状根。茎仰卧或基部斜上升。不分枝或下部分枝，密被倒向短柔毛和开展的腺毛。

基生叶较小，早枯，茎生叶互生；托叶卵状披针形，长10-12毫米，宽2-4毫米，外被长柔毛；茎生叶具长柄，柄长为叶片的2-3倍，密被短柔毛和开展的腺毛，上部叶柄短小；叶片三角形或近五角形，长2-3厘米，宽3-4厘米，3-5深裂近基部，裂片菱形，下部宽楔形，上部羽状齿裂，小裂片宽牙齿状，先端急狭，表面被伏毛，背面被短柔毛和沿脉被密毛。

原图链接 来自植物标本馆

花序腋生于上部叶腋和顶生，稍长于叶，密被开展的腺毛，总花梗具2花；苞片披针状钻形，长4-5毫米；花梗稍短于叶，密被开展腺毛；萼片卵状椭圆形或椭圆状披针形，长9-11毫米，宽2.5-3.5毫米，先端具长约2毫米的尖头，外被柔毛和开展腺毛；花瓣白色，具紫色脉纹，倒长卵形，长为萼片的1.5-2倍或等长，花丝和花药暗紫色，花丝下部扩展，被硫长柔毛；子房密被糙毛，花柱分枝紫黑色。

蒴果长约3厘米，被短柔毛和开展的腺毛。种子肾圆形，长约3厘米，宽约1.5厘米，具密细网纹。花期7-8月，果期9-10月。

Geranium christensenianum Hand. -Mazz. Symb. Sin. 7: 621. 1933; 云南植物志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.

大姚老鹳草生长环境

生于海拔2 300-2 800米的林下、灌丛和向阳山坡。

大姚老鹳草分布范围

分布于云南（大姚、东川、玉溪）。