3. Gossypium thurberi Todaro, Relaz. Cult. Coton. 120. 1877.
Algodoncillo, wild cotton Algodoncillo, wild cotton
Thurberia thespesioides A. Gray, Pl. Nov. Thurb., 308. 1854, not Gossypium thespesioides (R. Brown ex Bentham) F. Mueller 1875
Plants 2 m, freely branching. Stems 5-angular when young, glabrate. Leaves: stipules linear, 5–10 mm; petiole quadrangular, 1/2–3/4 as long as blade; blade deeply 3–5-lobed, lobes narrowly lanceolate (4+ times as long as wide), 5–15 cm, membranous, base subcordate, apex long-acuminate, surfaces glabrate. Inflorescences: flowers sympodial. Pedicels 1–3 cm, with 3 prominent nectaries; involucellar bractlets persistent, ligulate, 0.8–1.2 cm, margins entire or apically few-toothed. Flowers: calyx 3 mm, apex truncate; petals cream, with red spot at base, sometimes spot absent, 1.5–2.5 cm; staminal column 9 mm, glabrous; style slightly exceeding androecium; stigmas 3–5. Capsules 3-locular, subglobose to oblong, 1–1.5 cm, punctate, externally glabrous, internally ciliate. Seeds 3–4 mm, glabrous or glabrate. 2n = 26.
Flowering late summer. Open, arid habitats, rocky hillsides, banks of seasonal streams; 800–2400 m; Ariz.; Mexico (Chihuahua, Sonora).
Gossypium thurberi occurs in central to southern Arizona, from Yavapai to Cochise counties.