Narrow-leaf morning glory

Convolvulus shumardianus Torrey in R. B. Marcy, Explor. Red River Louisiana, 291. 1852

Perennials. Stems trailing or twining. Leaf blades deltate-ovate or narrowly lance-ovate, 30–80 × 10–40 mm, base cordate to truncate, surfaces glabrous. Peduncles glabrous. Flowers: sepals not dotted with dark spots, elliptic, oblong, or orbiculate, 10–15 mm, outers shorter than inners, coriaceous, surfaces glabrous; corolla pink or white, throat purple or red inside, funnelform, 50–80 mm, limb 50–80 mm diam.

Flowering Jun–Aug. Plains, prairies; of conservation concern; 200–600 m; Kans., Okla., Tex.

Ipomoea shumardiana is known only from areas where I. leptophylla and I. pandurata are sympatric; the names I. longifolia and I. pandurata have been misapplied to plants of I. shumardiana.