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| | Sytsma, Kenneth J., Jeffrey Morawetz*, J. Chris Pires, and Clifford W. Morden. (Site not responding. Last check: 2007-10-28) |
 | | The traditional Urticales (Ulmaceae, Celtidaceae, Cannabaceae, Moraceae, Urticaceae, and Cecropiaceae) is one of the more controversial orders in terms of family circumscriptions and both inter- and intra-familial phylogenetic relationships. |
 | | Recent molecular evidence has clarified its position as a monophyletic assemblage within a now expanded Rosales, with close relationships to an unresolved group including Barbeyaceae, Dirachmaceae, Rhamnaceae, and Elaeagnaceae. |
 | | Although the Ulmaceae has now been demonstrated to be sister to the rest of the urticalean lineage with both morphological and molecular data, the circumscription and relationships of the other families has remained unclear and controversial. |
| www.ou.edu /cas/botany-micro/botany2000/section13/abstracts/232.shtml (329 words) |
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