Karyological investigations on several species of genus Rebutia Sect. Digitorebutia (Cactaceae)

摘要

These are the first avaiable data about the karyology of the taxa belonging to Rebutia Sect. Digi-torebutia, the section of genus Rebutia K. Schum. with more species. Eight species of Sect. Digitorebutia were investigated. Out of the species studied, seven (R. pygmaea, R. raulii, R. steinmannii, R. major, R. diersiana, R. haagei and R. gavazzii) are polyploid, with tetraploid chromosome number 2n=4x=44, and one (R. leucanthema) is diploid, with chromosome number 2n=2x=22; x=11. This is the first karyotype information of all the species investigated.