Pollinaria Morphology of Tylophora (Asclepiadaceae)
娃儿藤属（萝藦科）植物花粉器形态

Pollinaria morphology of 17 species of Tylophora in China was observed under light microscope (LM). Four types of retinaculum (oblong, square, triangle and inverse triangle) and three types of pollinia (spheroidal, prolate and perprolate) were observed. The length of the caudicle, the shape and size of retinaculum and pollinia varied markedly. So these characters could be used to discriminate different species within Tylophora. Therefore, they were of significance in studying on classification of Tylophora.