DEVELOPMENT OF OVULE AND SEED-COAT OF DICHAPETALUM MOMBUTTENSE ENGL. WITH NOTES ON OTHER SPECIES

The ovule primordium of Dichapetalum mombuttense seems to be trizonate. The ovule is tenuinucellate and both integuments are of dermal derivation. During seed development the whole inner integument and a part of the outer integument are resorbed. The outer integument is vascularized. The seed-coat is exotestal and consists of a differentiated outer layer of the outer integument and crushed remains of the middle layers. The endosperm is initially nuclear, later to become one cell layer thick. The systematic postion of Dichapetalaceae is discussed.