Chromosome numbers in Bromeliaceae

the present study reports chromosome numbers of 17 species of bromeliaceae, belonging to the genera encholirium, bromelia, orthophytum, hohenbergia, billbergia, neoglaziovia, aechmea, cryptanthus and ananas. most species present 2n = 50, however, bromelia laciniosa, orthophytum burle-marxii and o. maracasense are polyploids with 2n = 150, 2n = 100 and 2n = 150, respectively, while for cryptanthus bahianus, 2n = 34 + 1-4b. b chromosomes were observed in bromelia plumieri and hohenbergia aff. utriculosa. the chromosome number of all species was determined for the first time, except for billbergia chlorosticta and cryptanthus bahianus. our data supports the hypothesis of a basic number of x = 25 for the bromeliaceae family and decreasing aneuploidy in the genus cryptanthus.