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*Porophyllum macrocephalum A.P. de Candolle. Yerba Porosa, Pápaloquelite. Phen: Sep-Oct. Hab: River banks, disturbed urban areas. Dist: Native of w. TX, s. NM, s. AZ south to Mexico, Central America, and South America; West Indies. Spontaneous in Arkadelphia, Clark County, AR (Serviss & Serviss 2023b).

Origin/Endemic status: Native

Synonymy: = K4, Mex; = n/a – RAB; = Porophyllum ruderale (Jacq.) Cass. var. macrocephalum (DC.) Cronquist – FNA21, Serviss & Serviss (2023b); < Porophyllum ruderale (Jacq.) Cass.

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