青城细辛的花器官发生

利用扫描电镜观察了青城细辛（Asarum splendens）的花器官发生过程。青城细辛的花器官为轮状结构，向心发生，依次为两轮3基数的花被原基，两轮6基数的雄蕊原基和一轮6基数的心皮原基。两轮花被原基互生，只有外轮（先发生的一轮）花被原基完全发育，而内轮（后发生的一轮）花被原基在发育过程中逐渐退化。两轮雄蕊原基为离心发生：位于内侧的一轮雄蕊原基先发生，每两个原基正对第一轮发生的花被原基，外侧的一轮雄蕊原基后发生，与内轮雄蕊原基互生。心皮与内侧的一轮雄蕊互生。

Floral Organogenesis of Asarum splendens (Maekawa) C.Y.Cheng et C.S.Yang

The floral organogenesis of Asarum splendens （Maekawara） C. Y. Cheng et C. S. Yang was observed under scanning electron microscope. Floral primordia were initiated in a whorled and centripetal pattern：the two whorls of three perianths were initiated first and then the two whorls of six stamens and one whorl of six carpels. During the developmental process of two ahemating whorls of perianth primordia, only the outer （initiated firstly） whorl developed completely, and the inner whoa （initiated secondly） stopped differentiating gradually. The inception of two whorls of stamen primordia was centrifugal：the inner whorl was initiated firstly with every two primordia in front of each perianth primordium of the first whorl, and the outer whorl was initiated secondly, alternating with the first whorl of stamen primordia. The capel primordia were alternating with the inner whorl stamen primordia.