Abstract
The organs of the flower ofLimnanthemum cristatum Griseb., arise in acropetal succession. The tapetum of the microsporangium is multi-nucleate and shows nuclear fusion. The diploid number of the species is determined for the first time as 18 and is confirmed from the results of meiotic counts (n = 9). The pollen grains are three-celled at the shedding time. The embryo-sac shows integumentary tapetum and a chalazal nutritive tissue. Their role in the economy of the nutrition of the ovule is discussed. The development of microsporangium inEnicostemma littorale Blume., is normal. The tapetum is uni-nucleate. The haploid chromosome number of this species has been recorded for the first time as nineteen. The development of embryo-sac and embryo are of the normal type.
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