中国苎麻属植物性别表现及其演化

苎麻属植物为单性花，已往文献将其性别分为雌雄同株、雌雄异株、雌雄同株或雌雄异株、雌雄同株或全雌株四类：而据我们对活体保存的苎麻属五个分类学组的16种7变种的系统调查，仅观察到雌雄同株、全雌或雌雄同株两类，未见其它的两种性别类型的物种。帚序苎麻组、腋球苎麻组、序叶苎麻组为雌雄同株物种，大叶苎麻组性别表现为雌雄同株、雌雄同株或全雌。苎麻属某些种内居群间、居群内性别分化表现亦存在较大差别，这可能与苎麻属中同时存在无融种综和多倍种综的复杂种群结构有关。苎麻属植物性别演化趋势是由雌雄同株向雌雄异株或全雌株演化。

The Sex Phenotype and Evolution in Boehmeria Jacq

The flowers of Boehmeria Jacq were unisexual.The plants of Boehmeris Jacq were divided into two types according to their sexual phenotype,they are monoecious,monoecius or femal.Monoecism was major type in Sect Zollingerianae and Boehmeria.In Sect Duretia,the sex-ual phenotype complex and diversified,and all of the two types was observed,the majority was mo-noecious or femal.The sexual evolution of Boehmeria Jacq was from monoeciousto dioecious or fe-mal.