Bastardiastrum is a genus of flowering plants in the mallow family Malvaceae and is native to Mexico. They are shrubs or subshrubs with viscid (and usually malodorous) stems.

Species Eight species are currently accepted.

Bastardiastrum batesii Fryxell & S.D.Koch Bastardiastrum cinctum (Brandegee) D.M.Bates Bastardiastrum gracile (Hochr.) D.M.Bates Bastardiastrum hirsutiflorum (C.Presl) D.M.Bates Bastardiastrum incanum (Brandegee) D.M.Bates Bastardiastrum tarasoides Fryxell Bastardiastrum tricarpellatum (B.L.Rob. & Greenm.) D.M.Bates Bastardiastrum wissaduloides (Baker f.) D.M.Bates

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