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SUMMARY
Nineteen different chromosome numbers ranging from 2 n=18 to 96 have been obtained from an analysis of 8 species and 65 garden cultivars of the genus Zephyranthes.
Since the related genus Habranthus, with which Zephyranthes freely hybridises, has 2 n = 12 it is concluded that the basic number of the genus is 6.
The numerical range within the genus thus extends from 3x to 16x and superimposed upon this polyploid series is a secondary aneuploidy.
This poly-aneuploid system is confounded by a large degree of heteromorphism in chromosome morphology. A small part of this heteromorphism stems from the presence of a stable telocentric in three cultivars but the main cause for this lack of regular homology remains to he defined.
