seven species of Engelhardia, the one species of Platycarya, 14 species of Carya, seven species of Pterocarya, and 16 species of Juglans. Several varieties of some species were studied. In general, from one to three collections were obtained for each species. More detailed studies of pollen size and pore number variation in several taxa have been carried out and discussed in a previous paper
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Donald R. Whitehead (1965) studied this question.
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