3. Tripterocalyx wootonii Standley, Contr. U.S. Natl. Herb. 12: 329. 1909.
Abronia wootonii (Standley) Tidestrom; Tripterocalyx carneus (Greene) L. A. Galloway var. wootonii (Standley) L. A. Galloway
Stems often reddish, at least at nodes, short glandular-pubescent, viscid. Leaves: petiole 1-6.5 cm; blade ovate to elliptic-oblong, 1.5-8 × 0.5-5 cm, margins entire, often undulate, often scabro-ciliate; surfaces glabrous or glandular-puberulent, somewhat ± glaucous abaxially. Inflorescences 10-25-flowered; bracts linear-lanceolate to ovate, 5-14 × 1.5-5 mm, papery, base often ± attenuate, margins glandular short ciliate, glabrous, or glabrate. Perianth: tube pink to pinkish red, 12-25 mm, limb white adaxially, often pinkish abaxially, 8-11 mm diam., lobes showy, over 1.5 mm. Fruits oval in profile, 13-20(-25) × 9.5-17.5 mm, walls indurate; lateral ribs 1-3, or ribs absent, if exending into wings, only slightly raised; wings (2-)3(-4).
Flowering spring-fall. Sandy soils, desert scrub; 1000-2200 m; Ariz., Colo., N.Mex., Utah.