Reinstatement of Clematis petriei (Ranunculaceae), and typification and variation of C-forsteri

Clematis petriei is reinstated at species rank, being distinguished fi-om t he widespread and variable C. forsteri by a number of flower and achene cha racters. In C. petriei the adaxial surface of the sepals and the achenes ar e glabrous, and the achenes are chestnut brown. C. forsteri has hairy sepal s and achenes, and the achenes are usually light to dark brown. A lectotype for C. forsteri is selected from the J. E. Smith Herbarium, and lectotypes are selected for all names placed in synonymy of C. forsteri. Patterns of leaf variation, with a strong geographic basis, are described and illustrat ed for C. forsteri.