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Pollen cell number was studied in 124 species of Saxifraga and six species of Micranthes. Binucleate pollen is present in all the six species of Micranthes studied and in 96 species of Saxifraga. Trinucleate pollen occurs in 28 species of Saxifraga and is confined to section Ciliatae subsection Hirculoideae, where it is a putative synapomorphy, and to two species of subsection Serpyllifoliae. Trinucleate...
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