Hi again all, A good overview of the genus is given in the following paper: Species richness, geographic distribution and conservation status of the genus Dahlia (Asteraceae) in Mexico) https://abm.ojs.inecol.mx/index.php/abm/… A species (Dahlia mixtecana) was recently published: https://researchgate.net/publication/… More material can be found here: https://researchgate.net/project/… Cheers - Luc Le 2020-11-28 15:55, Luc Bulot via pbs a écrit : > Hi all, > > For those interested here is a link to download the paper by Sarr & > Sorensen (2013) with the original description of D. campanaluta. > > https://pdfs.semanticscholar.org/7b12/… > > Copied from the original description are the specific characters : > > The specific epithet, campanulata, draws attention to the unique > bell-shaped capitula. When the inner and outer involucral bracts of > garden-grown plants wereremoved just prior to ligule extension and > elongation, the ultimate position of the ligules resembled flower heads > with bracts that were not altered. Apparently, the mechanism for this > unique ligule position lies within the ray florets themselves or the > receptacle. > > There are three other distinguishing features for D. campanulata. > Although the plants are not particularly large for the genus, the > diameter of the capitulum is up to 5.5 cm wider than the next largest > species, D. spectabilis. Leaf petioles have enlarged, clasping bases > that are more developed and much thicker than in anyother species of > Dahlia (Fig 1B). The tubers are enormous, exceeding 0.5 m in length. > > I'll dig out literature on D. spectabilis now. > > Hope this helps, > > Luc > > Le 2020-11-28 13:15, Wylie Young via pbs a écrit : > >> I grow the double Dahlia imperialis, and some droop a little, and others don't. But then, some are double and some are not, most doubles occurring in the fall. The attached photo of a white dahlia came from a seed, and is probably D. campanulata (a very shady dealer, so I have to guess). >> -------------- next part -------------- >> A non-text attachment was scrubbed... >> Name: Dahlia imperialis (2).JPG >> Type: image/jpeg >> Size: 556780 bytes >> Desc: not available >> URL: <http://lists.pacificbulbsociety.net/pipermail/pbs/…> >> -------------- next part -------------- >> A non-text attachment was scrubbed... >> Name: Dahlia imperialis.JPG >> Type: image/jpeg >> Size: 2247327 bytes >> Desc: not available >> URL: <http://lists.pacificbulbsociety.net/pipermail/pbs/…> >> -------------- next part -------------- >> A non-text attachment was scrubbed... >> Name: DSC_7092.JPG >> Type: image/jpeg >> Size: 1899406 bytes >> Desc: not available >> URL: <http://lists.pacificbulbsociety.net/pipermail/pbs/…> >> _______________________________________________ >> pbs mailing list >> pbs@lists.pacificbulbsociety.net >> http://lists.pacificbulbsociety.net/cgi-bin/… >> Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> > > -- > > Dr. Luc G. Bulot - Senior Researcher - CEREGE - Aix-Marseille > Université, France and Visiting Researcher, Lead Biostratigraphy Team, > NARG, University of Manchester, UK > > https://www.researchgate.net/profile/Luc_Bulot/ > > https://www.cerege.fr/en/node/169/ > http://www.narg.org.uk/ > _______________________________________________ > pbs mailing list > pbs@lists.pacificbulbsociety.net > http://lists.pacificbulbsociety.net/cgi-bin/… > Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> -- Dr. Luc G. Bulot - Senior Researcher - CEREGE - Aix-Marseille Université, France and Visiting Researcher, Lead Biostratigraphy Team, NARG, University of Manchester, UK https://www.researchgate.net/profile/Luc_Bulot/ https://www.cerege.fr/en/node/169/ http://www.narg.org.uk/ _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>