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SUMMARY
Cytological studies of 10 collections representing all the 5 species known of the genus Sibthorpia L. indicated that S. africana and S. peregrina are diploids with x=10, S. europaea a diploid with x=9, and S. repens contains tetraploids and octoploids based on x=9, whereas S. conspicua is a diploid with the (secondary) basic number 17. Crossing experiments demonstrated that the genus consists of two comparia, one containing S. africana and S. peregrina, which intercross well enough to produce some fully fertile F9 plants, the other containing the remaining 3 species, between which only sterile hybrids were obtained.
