Cytology of Some Members of the Family Iridaceae

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Abstract
Acyto-logical study has been made of one species in each of four genera of the Iridaceae: Babiana sulphurea, 2n = 14; Tritonia crocata, 2n = 60; T. crocata. Type I, 2n = 22; Tigridia pavonia 2n = 26; Moraea iri-dioides var. Mcleyii and var. bicolor, 2n = 40; M. iridioides var. johnsonii, 2n = 20. It is suggested that n = 7 is probably the basic chromosome number of Babiana. Tigridia pavonia shows distinct size differences among the chromosomes of the complement. Two pairs are about twice or three times as long as the shorter pairs. Tritonia crocata Type I was formerly placed in Montbretia, and appears to be allied cytologically to Crocosmia. It evidently is more closely related to both of these genera than to Tritonia. The three varieties of Moraea iridioides and Tritonia crocata show similarities in chromosome number and karyotype structure. They are assumed to have descended from a common evolutionary line.

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