The Systematic Botany and Taxonomy of Polemonium foliosissimum A. Gray (Polemoneaceae)

The need for experimental data to determine the taxo- nomic relationships within Polemonium foliosissimum A. Gray was indicated by previous works dealing with the genus. A synthesis of the data, gleaned from systematic studies, indicated the presence of four closely related taxa, which were assigned varietal rank. These varieties were: var. flavum (Greene) Comb. nov.; var. foliosissimum (A. Gray) Comb. nov.; var. Molle (Greene) Comb. nov.; and var. alpinum (Brand) Comb. nov.