Plants perennial. Stems ascending to semierect, slightly to moderately branched, elongate, glandular-pubescent to viscid. Leaves: petiole 0.5–4 cm; blade ovate to elliptic, 2–5 × 1.5–3.5 cm, margins entire or occasionally ± repand and slightly undulate, surfaces glandular-puberulent. Inflorescences: peduncle longer than subtending petiole; bracts ovate to elliptic, 7–13 × 4–6 mm, papery, glandular-pubescent; flowers 20–75. Perianth: tube pink to magenta, 18–32 mm, limb magenta, 8–10 mm diam. Fruits broadly turbinate or cordate in profile, 8–15 × 6–12 mm, 0.7–2 times as long as wide, scarious, with a low, conic, inconspicuous beak at apex; wings 5, often twisted, usually smooth, occasionally rugose, not reticulate veined at apex, without cavities.
Phenology: Flowering spring, opportunistically after summer rains.
Habitat: Sand dunes
Elevation: 100 m
Of conservation concern.
Abronia macrocarpa is on the United States endangered species list; and it is in the Center for Plant Conservation’s National Collection of Endangered Plants.