Isocarpha oppositifolia (Linnaeus) Cassini var. achyranthes (A.P. de Candolle) D.J. Keil & Stuessy. Rio Grande Pearlhead. Phen: (Jun-) Oct-Dec. Hab: Thickets, clay dunes, thickets. Dist: TX, Mexico, Central America, South America, perhaps not native in TX.
Origin/Endemic status: Native
Synonymy: = FNA21, K4; < Isocarpha oppositifolia (L.) Cass. – Bah, Mex, Tx
Heliophily: 9
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