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Celtis & Cannabinaceae
In article , Iris Cohen
writes The older authorities, including IPNI (IK) include Celtis in the Ulmaceae, which belongs to the order Urticales. When did the above happen, & what is the rationale? The APG classification tends towards the lumper side for orders; they've sunk Urticales (and, IIRC, some other orders) in Rosales. Urticales survives as the suborder Urticinae. It seems that the DNA data places Celtis and allies, hence Celtidacee, as distinct from Ulmaceae, and has Cannabaceae/Cannabinaceae nested within Celtidaceae; Cannabaceae has priority. Celtidaceae and Cannabaceae are also united by chromosome number, FWIW. http://www.inbio.ac.cr/papers/manual.../oct98lit.html refers to a 1998 paper Wiegrefe, S. J., K. J. Sytsma & R. D. Guries. 1998. The Ulmaceae, one family or two? Evidence from chloroplast DNA restriction site mapping. Pl. Syst. Evol. 210: 249--270 A later paper is Song, B.-H., X.-Q. Wang, F.-Z. Li & D.-Y. Hong. 2001. Further evidence for paraphyly of the Celtidaceae from the chloroplast gene matK. Pl. Syst. Evol. 228: 107–115. There is more discussion at http://www.mobot.org/MOBOT/research/...rosalesweb.htm -- Stewart Robert Hinsley |
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