摘要
Cycas属植物羽状复叶上的小羽片 ,是从不开叉向二叉开裂逐步发展的。二叉开裂后 ,小羽片继续进一步发展、进化 ,在其开叉分裂的小羽片上再次二叉开裂 ,成为三回、四回、五回二叉开裂的裂片 (小叶 ) ,最后小羽片发展到多回开裂 ,成为Cycas属植物羽状复叶上最进化的一种小羽片类型。着生这种进化类型小羽片的叉叶类苏铁是Cycas属植物中最进化的种群。
The pinnae of compound leaf of .Cycas. could produce and evolve from a single pinnae to dichotomous pinnae gradually. From the first dichotomous, the pinnae will grow up and develop bi_,tri_even to multidichotomously usually in different species or sometimes in the same species. The species of the last form could be one of the most advanced species of .Cycas. Stangerioides. with forked pinnae should be the most advanced species of .Cycas..
出处
《植物学通报》
CSCD
北大核心
2001年第2期246-250,共5页
Chinese Bulletin of Botany
