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.  Three taxa are recognized at the rank of species based on molecular phylogenetic studies in Phacelia sect. Glandulosae (Hydrophyllaceae, Boraginales). Results of those studies did not support a monophyletic Phacelia crenulata Torr. ex S. Watson, because 3 varieties of that species were supported as distinct lineages based on molecular (nuclear and chloroplast) and morphological characters. Typification and status is clarified for P. corrugata A. Nelson and P. orbicularis Rydb. A new nomenclatural combination for P. crenulata var. angustifolia N.D. Atwood is established to elevate that variety to species rank, as Phacelia angustifolia (N.D. Atwood) Walden, comb. et stat. nov.

Nomenclatural Adjustments in Phacelia sect. Glandulosae (Hydrophyllaceae, Boraginales)