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Additional index words. Carya illinoensis, microscopy, integument, nucellus, central nucleus, egg apparatus, synergid Abstract. Comparative anatomical features of nonaborting (normal) and aborting pistillate flowers were examined with light and scanning electron microscopy during the first of four physiological drops characteristic of pecan ( Carya illinoensis (Wangenh.) C. Koch). Flowers sampled over a 3-year period from a protandrous and a protogynous cultivar (Desirable and Wichita, respectively) did not have any tissue necrosis. Diameter, length, and weight of aborting intact flowers were significantly less at 65%, 55%, and 30%, respectively, in aborting than nonaborting intact flowers. A common anatomical deviation in aborting flowers was that the integument was less extended over the nucellus of the ovule than in nonaborting flowers. The number of parenchymal nucellus cell layers lateral to the embryo sac often was less in aborting than nonaborting flowers. Embryo sacs were inflated in nonaborting flowers, but appeared deflated in aborting flowers. Both sacs had a conspicuous central nucleus, egg, and synergid, with a second synergid evident in the embryo sacs of some nonaborting flowers. Thus, aborting pecan flowers had incompletely developed ovules with no evidence of necrosis.

Anatomy Differs for Aborting and Nonaborting Pistillate Flowers in Pecan