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龙须藤别名羊蹄藤、乌郎藤、过岗圆龙等。为豆科羊蹄甲属植物,国内产于浙江、福建、广东、广西、江西、湖南、湖北和贵州等地。国外主要分布于越南、印度尼西亚、印度等地。龙须藤喜光照,较耐阴,适应性强,耐干旱瘠薄,多生于低海拔至中海拔的丘陵灌丛或山地疏林和密林中。根系发达,穿透力强,常生于岩石、石缝及崖壁上。龙须藤有卷须,嫩枝和花序薄被紧贴的小柔毛。叶纸质,卵形或心形,叶柄纤细,略被毛。总状花序狭长,腋生,有时与叶对生或数个聚生于枝顶而成复总状花序,被灰褐色小柔毛。花期6~10月,果期7~12月。
Dragon Saussure alias calamus vine, Wolong vine, over the post and so on. For Leguminosae genus, domestic production in Zhejiang, Fujian, Guangdong, Guangxi, Jiangxi, Hunan, Hubei and Guizhou and other places. Foreign mainly in Vietnam, Indonesia, India and other places. Long Xusuo hi light, more shade-tolerant, adaptable, drought-resistant infertility, more than low-altitude habitat in the mid-elevation hilly shrubs or mountain forests and dense forests. Roots developed, strong penetration, often born in rocks, crevices and cliffs. Dragon-Goblin has tendrils, twigs and inflorescences thinly clingy pubescent. Leaves papery, ovate or cordate, petiole slender, slightly hairs. Racemes narrow, axillary, sometimes with the leaves opposite or a few polygamous branches in the top of the complex racemes, was beige pubescent. Flowering from June to October, fruit period from July to December.