Abstract
Embryological aspects ofSisyrinchium striatum andS. californicum are studied. The wall of the quadrilocular anther consists of an epidermis, fibrous endothecium, one or two middle layers and a glandular tapetum. The tapetum is of dual origin. Cytokinesis during microsporogenesis are simultaneous. The microspore tetrads are isobilateral or tetrahedral. Pollen grains are shed at two-celled stage. Emryo-sac is of the Polygonum type. Endosperm is Nuclear. The apical cell of the two-celled proembryo contributes to the development of the embryo proper and part of the suspensor. The basal cell which may or not divide forms the suspensor.
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