Thurber’s morning glory

Ipomoea gentryi Standley

Perennials, root elongate, tuber­ous. Stems trailing or twining. Leaf blades ± sagittate, 10–50 × 20–65 mm overall, base sagit­tate, or blades palmatisect, lobes 5–7, lanceolate, linear, or ob­long, surfaces sparsely strigose. Peduncles glabrous. Flow­ers nocturnal; sepals lanceolate to lance-linear, 12–15 × 3–4 mm, ± herbaceous, base obscurely warty or not, apex acuminate, setaceous-caudate; corolla white, tube green, limb red, rose, drying purple, funnelform-salverform, 50–80 mm, limb 50–65 mm diam.

Flowering Aug–Sep. Oak woodlands, rocky sites; 1100–1600 m; Ariz.; Mexico (Chihuahua, Sonora).