Abstract
The morphology and anatomy of ovules, immature and mature seeds of 18 species of Cactaceae (pereskieae, Opuntieae and Cereae B. and R.) have been studied in an attempt to understand their development and their structure. Characteristics of the nucellus, the micropyle, the funiculus and the funicular covering (Opuntieae) in the ovule, and features of the seed coat, the embryo, the perisperm, the hilum and the hilum cup in the mature seed have been analized.The ovular position is amphitropous in most species. The funicular covering of Opuntieae commonly called aril or third integument is a true funicular covering and this structure is different from that of arils. There is a relationship between the degree of thickening in the integuments and the size and form of the hilum and hilum cup. Apparently, the presence of tannins incrusted on the cell wall of seed coat cells increases the hardness of the walls and gives them the brittleness
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