▁for ▁that ▁reason . ▁The ▁genus ▁as ▁a ▁whole ▁is ▁vast ly ▁w ides p read ▁and ▁has ▁a ▁wide ▁range ▁of ▁p lo id y ▁located ▁in ▁almost ▁every ▁continent . ▁It ▁has ▁been ▁research ed ▁on ▁the ▁relationship ▁between ▁the ▁types ▁of ▁p lo id y ▁being ▁specific ▁to ▁a ▁certain ▁continent , ▁hint ing ▁that ▁there ▁is ▁some ▁sort ▁of ▁environmental ▁pressure ▁encourag ing ▁pol yp lo id y ▁to ▁occur . ▁Specifically , ▁in ▁the ▁Dra ba ▁v erna ▁species , ▁they ▁are ▁referred ▁to ▁the ▁an e up lo id ▁type ▁in ▁the ▁genus , ▁for ▁the ▁ab normal ▁number ▁of ▁chrom os om es . ▁The ▁an e up lo id ▁D . ▁v erna ▁is ▁typically ▁found ▁in ▁mountain ous ▁regions . ▁The ▁sus pected ▁cause ▁of ▁the ▁high ▁variation ▁of ▁p lo id y ▁in ▁these ▁mountain ous ▁regions ▁is ▁due ▁to ▁the ▁press ures ▁of ▁the ▁changing ▁environment . ▁When ▁the ▁species ▁is ▁facing ▁more ▁stress ▁from ▁the ▁environment ▁in ▁there ▁is ▁a ▁select ive ▁pressure ▁for ▁ap om ix is , ▁or ▁a sex ual ▁reprodu ction , ▁which ▁may ▁give ▁an ▁answer ▁to ▁this ▁plant ' s ▁t endency ▁to ▁have ▁an ▁une ven ▁p lo id y ▁number . ▁On ▁average , ▁in ▁the ▁Dra ba ▁genus ▁the ▁higher ▁the ▁elev ation ▁and ▁latitude ▁of ▁the ▁species ▁the ▁more ▁p lo id y ▁the ▁species ▁poss esses . ▁ ▁References ▁ ▁v erna <0x0A> </s> ▁Here ▁and ▁G one ▁is ▁an