This is a preview. Log in through your library . Abstract Studies of reproductive structures are important in understanding developmental processes and taxonomic and phylogenetic relationships of ...

The ovule primordia of Polygala are trizonate. The inner integument is two layered and of dermal origin. The outer integument can be two- to multilayered. The changeover from a subdermally initiated ...

Structure of a flower, consisting of a pistil (female part) in the center and stamen (male part) on each side. The pistil has ovules containing egg cells, and the stamen consists of pollen containing ...

After observation of over 300 specimens collected from the Upper Devonian of Dongzhi County, Anhui Province, Prof. De-Ming Wang from Peking University locked his eyes on a series of ovules that are ...