Abstract

SummaryThe North American Prairie plant, Parthenium integrifolium L. (Compositae: Heliantheae: Ambrosiinae) is described and illustrated. Related genera in the subtribe are commented on, as well as the better‐known species, P. argentatum A. Gray, the Guayule Rubber Plant, and infrageneric taxonomy within Parthenium L., in addition to the characteristics of the genus. Aspects of cultivation, propagation, pests and diseases and availability for P. integrifolium are also noted. A full synonymy of this rather variable species is provided, together with type citations, locations of known types, and related commentary. The distribution, habitat and ecology, phenology, common names and conservation status are stated or discussed, together with comments on usage, and the species' roots being used as an adulterant in preparations of Echinacea purpurea (L.) Moench.

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