Abstract
Summary. Karyotypes of six species of Hippeastrum and one of Amaryllis were analysed. Except for one specimen of H. aulicum from Southern Brazil, all plants were from Bolivia. The basic chromosome number of every specimen was x = 11 and of 38 individuals examined from 19 sites, 20 were diploid (2n = 22) and 18 tetraploid (2n = 44), with both diploids and tetraploids present at two sites. No odd-number polyploids (3x, 5x, 7x) were found. The karyotypes were uniform and bimodal, with 7 pairs of large acrocentric chromosomes and 4 pairs of shorter metacentrics in the diploids, confirming the close alliance of the two genera. Overall chromosome size varied from one species to another. The karyotype of one diploid specimen of H. reginae was modified by a Robertsonian exchange affecting two homologous chromosomes.
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