Abstract

Seed external morphology and coat anatomy of ten species of tribeAsclepiadeae (Asclepiadoideae-Apocynaceae) in Egypt are investigated usingLight Microscope (LM) and Scanning Electron Microscope (SEM). Seedfeatures studied include variations in shape, colour, texture, hilar details,surface scan characteristics and seed coat anatomy. Anatomically, the testahas been found to be of greatest value in determining taxonomic relationships.Some seed characters were found to be very distinct at the generic level, suchas the presence of two rows of the palisade-like cells of the seed wing (oneupper and one lower) which could be considered as taxonomic marker for thetwo Pergularia species. In addition, the presence of mounds on the upperconcave side of the seed coat is recorded only in two Asclepias species andSolenostemma arghel; with large, tubular, lignified, pitted cells in twoAsclepias species, and small, rectangular, radially elongated in Solenostemmaarghel.

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