[目的]探讨在昆明地区一年生植物波斯菊连萼瘦果形态变异特性及其环况适应能力.[方法]采用显微观测与生物统计的方法分析波斯菊连萼瘦果变异与适应特性.[结果]波斯菊植物连萼瘦果存在二型性,有长型较重的与短型较轻2种形态.对该二型瘦果大小变异统计分析发现,二型瘦果长度与重量上的差异显著,而宽度与厚度上不存在差异性.短型瘦果长度与重量的变异比长型瘦果大.[结论]由边花发育的波斯菊短型瘦果是波斯菊种子长距离扩散的适应性特征;中部花发育的长型搜果为短距离或就地种子扩散的适应性特征.二型连萼瘦果的存在增加了波斯菊对其栽培环境的适应能力.%[Objective]The aim was to explore cypsela's morphological variation and enviromental adaptability of Cosmos bipinnatus Cav. in Kunming. [ Method ] Microscopic observation and biological statistical methods were used to analyze the cypsela's variation and adaptation characteristics in C. bipinnatus. [ Result] The study had firstly shown that there were two cypsela types, a long-type heavier cypsela and short-type cypsela. Statistical analysis suggested that the differences of two types of cypsela in length and weight were significant, but width and thickness difference did not exist The variation of short cypsela was more than the long cypsela. [ Conclusion ] The short- type cypselas were developed by the outer flowers, and the form was the adaptive characteristics for long-distance spread of its needs The long-type cypselas were developed by centra flowers .and the form was the adaptive characteristics for short-distance or local dispersal for its seeds. Two cypsela's forms benefited the ability to adapt to its cultural environment in C. bipinnatus.
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