1996/08/01 by Hans V. Hansen, J. P. Hjerting · 27 citations
Agricultural and Biological Sciences · #Flowering Plant Growth and Cultivation #Chromosomal and Genetic Variations #Biological Control of Invasive Species #Dahlia #Biology #Heliantheae #Botany #Asteraceae #Hybrid #Ploidy #Synonym (taxonomy) #Ustilago #Genus #Genetics
paper · doi:10.1111/j.1756-1051.1996.tb00256.x
published in Nordic Journal of Botany 16(4), 445-455 (Wiley)
openalex publication_date 1996/08/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26
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 .