• Background Ovules as developmental precursors of seeds are organs of central importance in angiosperm flowers and can be traced back in evolution to the earliest seed plants. Angiosperm ovules are ...
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 ...
The evolutionary history and phylogenetic relationships of seed plants have long captivated botanists and palaeobiologists alike. Recent investigations elucidate the mechanisms underlying key ...
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 ...
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