Variation in the development of ascidiform carpels, an S.E.M.-investigation

Attention is drawn to the differences in place and time of origin of the abaxial (upper) and adaxial (lower) parts of the margin of ascidiform carpel primordia. It is assumed that the adaxial parts will develop more fully when the primordia have more space and time to develop on an expanding floral apex. The favoured occurrence of the margin at the base of the primordia seems a prerequisite to incipient syncarpy.