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Chromosome numbers of five Alyssum species (A. aizoides Boiss., A. aureum (Fenzl) Boiss., A. baumgartnerianum Bornm. ex Baumg. A. constellatum Boiss. and A. xanthocarpum Boiss.) from Turkey have been reported for the first time. A. aizoides and A. baumgartnerianum are tetraploid (2n=4x=32) while A. au-reum, A. constellatum and A. xanthocarpum are diploid (2n=2x=16).
In this study, the karyomorphology of five endemic Arabis taxa (A. alanyensis, A. androsacea, A. aubrietioides, A. davisii, and A. deflexa) was examined. The chromosome number of these species was determined for the first time. As a result of the karyomorphological studies, the chromosome number was determined to be x =8 for all species. Arabis androsacea and A. aubrietioides are tetraploid whereas other species are diploid. Considering the asymmetry indices, we can conclude that all taxa have symmetrical karyotypes. The most common karyotype formulas are 2n = 4x = 32m and 2n = 2x = 14m + 2sm, respectively. Arabis davisii (on the second chromosome pair) and A. deflexa (on the third chromosome pair) are distinguished from others by showing a secondary constriction.
Chromosome numbers of four endemic Hesperis species (H. armena Boiss., H. kotschyi Boiss., H. pisidica Hub.-Mor. and H. thyrsoidea Boiss.) in Turkey have been reported for the first time. All species have 2n=14 chromosomes, except H. pisidica Hub.-Mor. (2n=12). This species is also different from the others because of having satellite. Determining of the basic chromosome numbers x=6 and 7 are consistent with previous reports on Hesperis taxa in Turkey.