星叶草属2隙节及2裂叶及其系统学意义

THE DISCOVERY OF THE BILACUNAR NODES AND BILOBED LEAVES IN CIRCAEASTER AND THEIR SISTEMATIC SIGNIFICANCE

报道了存在于星叶草属植物中与单隙节共存的２隙节及与不分裂叶共存的２裂叶。通过分析后认为，这两个现象在该属植物中的出现并不是异常的。该属植物单隙和２隙节共存与毛茛科植物相似；

Two examples of bilacunar nodes and 21 examples of bilobed leaves from 500 individuals and 3500 leaves of Circaeaster was reported in this paper.The bilacunar nodes we found are similar to the cotyledonary nodes of Circaeaster .The different node structure of Circaeaster is similar to that of some genera and species of Ranunculaceae.These similarities shown that the bilacunar nodes of Circaeaster is not abnormal.13 of the 21 bilobed leaves are cataphylls,and 19% of the 21 bilobed leaves is with anastomousis in their open dichotomous venation.This rate is obvious higher than that of normal leaves.The bilobed leaves in Circaeaster is also not abnormal and probably be the reversion of the ancestor situation.