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1b. Polanisia dodecandra (Linnaeus) de Candolle subsp. riograndensis H. H. Iltis, Southw. Naturalist. 14: 116, fig. 1[top]. 1969.
Rio Grande clammyweed
Leaflets: blade apex rounded. Inflorescence bracts ovate to orbiculate. Petals pink, rose, or purple, (6-)8-14(-17) mm. Stamens (6-)7-17 mm, equaling or slightly longer than petals. Seeds tuberculate-rugose. 2n = 20.
Flowering spring-fall. River banks, coastal dunes, open woodlands, mesquite, and semi-desert; 0-100 m; Tex.; Mexico (Nuevo León, Tamaulipas).
Subspecies riograndensis is found along the lower Rio Grande in Texas and adjacent Mexico.
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