发育不完全

Then five petal primordia arised simultaneously in a whorl arrangement, followed by eight stamen primodia arised and last by pistil primodium.

雄花具有发育不完全之雌蕊；两性花之雄蕊虽然正常发育，但花丝不伸长且花药不开裂。

The silica-phellem block and stomate tubercle on 3rd leaf are underdeveloped, the tubercle of stomate block is small and dense in japonica, big and sparse in O.

发现了三叶期三叶片的硅化-木栓细胞带和气孔器乳突发育不完全的现象。