Sida alata S. Watson, Proc. Amer. Acad. Arts 20: 356. 1885; Horsfordia palmeri S. Watson

Shrubs, 1–2.5(–4) m, hairs dense, stellate, grayish yellow, rough. Leaves often folded, to 68 mm, petiolate to 8 cm to sessile distally; stipules 2–5 mm; blade ovate to triangular, 1–11.5 cm, base cordate, margins crenate or dentate to denticulate, apex acuminate. Inflorescences solitary flowers, rarely in groups of 3–5. Flowers: calyx campanulate, 3–10 mm; petals rose, pink, or pale lavender, 12–21 mm. Schizocarps 8–12 mm diam.; mericarps 9 or 10, 6–10 mm, sparsely stellate-hairy, lower cell reticulate, upper cell with 2 abortive ovules (rarely developing), wings lanceolate. Seeds 1 per mericarp, brown to blackish, 1.9 mm, minutely scabridulous. 2n = 30.

Flowering Sep–Apr. Disturbed and undisturbed sites, deserts; 0–600 m; Ariz., Calif.; Mexico (Baja California, Baja California Sur, Sonora).