Department of Biology (Ecology, Evolution, and Marine Biology), University of California, Santa Barbara, California 93110 USA; and Department of Plant Biology, Louisiana State University, Baton Rouge, Louisiana 93106 USA.
Am J Bot. 2002 May;89(5):748-57. doi: 10.3732/ajb.89.5.748.
Floral organogeny and development are described in Cadia purpurea, a legume with radial symmetry, unstable petal aestivation, and free organs, all unusual features among papilionoids. Flowers are usually solitary or, rarely, in few-flowered racemes. No bracteoles are formed. The order of organ initiation is unidirectional in each whorl, and the carpel initiates directly after petal initiation.The petal primordia remain small until all other floral organs have initiated, enlarged, and differentiated. Petal aestivation is variable, unlike the great majority of papilionoid flowers. Petal margins of Cadia grow straight outward rather than some petal margins curving inward inside the adjacent petal as is the case in other papilionoids. When adjacent growing petal margins of Cadia meet, chance determines which petal becomes positioned inside the other. Hence, the pattern of petal aestivation is random.
卡迪亚属植物的花器官发生和发育，该属植物具有辐射对称、花瓣不稳定覆瓦状排列和器官离生等特征，这些特征在豆科云实亚科中较为罕见。花通常单生，或者偶尔形成几朵组成的总状花序。没有小苞片形成。每一轮的器官发生顺序是单向的，心皮直接在花瓣发生之后发生。花瓣原基在所有其他花器官发生、增大和分化之前一直保持较小。花瓣覆瓦状排列是可变的，与绝大多数豆科云实亚科的花不同。卡迪亚的花瓣边缘向外生长，而不是像其他豆科植物那样，花瓣边缘向内弯曲，与相邻花瓣的内部相接。当相邻的卡迪亚花瓣边缘生长并相遇时，机会决定哪个花瓣位于另一个花瓣的内部。因此，花瓣覆瓦状排列是随机的。
