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The type of Phoradendron rusbyi Britton (Viscaceae) consists of two species of Phor- adendron, one hyperparasitic on the other. The hyperparasite is designated to be the type; the host mistletoe is P. crassifolium (DC.) Eichler. The protologue of the Bolivian Phoradendron rusbyi Britton (in Rusby, 1900; not to be confused with P. rusbyanum Trelease) has been puzzling in the past in that it seemed to be made up of discordant elements. Britton described leaf shape, while the rather fragmentary types at NY are strictly squa- mate. The species is exceedingly rare, being known only from the type collection. Inspection of the types at NY and US, however, has provided a solution to the problem.

A Hyperparasite Mistaken for an Inflorescence: The Identity and Typification of Phoradendron rusbyi Britton (Viscaceae)