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>