Premium
Observations on chromosome numbers and biosystematics in Dahlia (Asteraceae, Heliantheae) with an account on the identity of D. pinnata, D. rosea, and D. coccinea
Author(s) -
Hansen Hans V.,
Hjerting J. P.
Publication year - 1996
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1996.tb00256.x
Subject(s) - dahlia , biology , heliantheae , botany , asteraceae , hybrid , ploidy , synonym (taxonomy) , ustilago , genus , genetics , gene
The chromosome numbers in Dahlia (Asteraceae, Heliantheae) are surveyed, and counts made on species grown in the Botanic Garden, University of Copenhagen, are given. Next a biosystematic study of species within Dahlia sect. Dahlia is presented. It is concluded that taxa with the same chromosome number can be brought to hybridize without specific barriers (some diploids possibly excepted). Based on this conclusion, it is demonstrated that the original European introduction of dahlias from Mexico consisted of two tetraploid (2n = 64) hybrids and a native, diploid (2n = 32) D. coccinea with scarlet rays. One of the hybrids was named D. pinnara which designation is consequently not applicable for the native species, currently known under that name. Instead, the new designation D. sorensenii is formally established. The other hybrid, D. rosea , is a synonym of D. pinnara .