literature on Genus Dahlia

 
 
Help required………: I urgently require literature on Genus Dahlia (Asteraceae). Can anybody help me with it.

On what aspect you need to have literature?
Taxonomy/distribution or number of species?

Some relevant information can be accessed from http://www.uniprot.org/taxonomy/41562

and I attache some publications related to the genus Dahlia.
A Phylogenetic Analysis of the Genus Dahlia (Asteraceae) Based on Internal and External.pdf
Phylogeny, Distribution, and Classification of the Coreopsideae (Asteraceae).pdf

One more publication.
Dahlia History.pdf as attachment.