Cytological and Reproductive Differentiation in Sedum Section Gormania (Crassulaceae)

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Abstract
Analysis of the chromosomal status of the 12 taxa ofSedum sectionGormania reveals a euploid series ofn = 15, 30, and 45. Although plants of all taxa are self-compatible in varying degrees, those of the narrow endemics exhibit a high level of self-compatibility while the plants of all but one of the more widely distributed taxa tend to be weakly self-compatible or rarely selfincompatible. The narrow endemics include four diploids, all putative relicts, and two tetraploids. The widely distributed taxa include four diploids, one tetraploid, and one hexaploid. The differences in ploidal level and the degree of self-compatibility are assessed with respect to their possible roles in the evolutionary history of sectionGormania.