349. Ipomoea shumardiana (Torr.) Shinners, S.W. Naturalist 6(2): 101. 1961. (Shinners 1961: 10)

Convolvulus shumardianus Torr. in R.B. Marcy, Explor, Red River Louisiana 291 -2. 1853. (Marcy 1853: 291). Type. UNITED STATES. Marcy’s expedition 17 July 1852, sine col. (NY00318908).

Ipomoea shumardii Torr. in R.B. Marcy, Explor. Red River Louisiana 191. 1854, nom. nud., printing error.

Ipomoea carletonii Holz., Contr. U.S. Natl. Herb 1: 211. 1892. (Holzinger 1892: 211). Type. UNITED STATES. Oklahoma, Logan Co., Guthrie, M.A. Carleton 472 (holotype US00111374, isotypes K, US).

Type.

Based on Convolvulus shumardianus Torr.

Description.

Glabrous twining perennial. Leaves petiolate, 2-6 × 0.7-2.5 cm, broadly to narrowly ovate-deltoid to rhombic, truncate, rounded to cuneate at base, widest near base, acuminate, mucronate; petioles 0.8-3 cm. Inflorescence of few-flowered, pedunculate cymes; peduncles 0.5-6 cm; bracteoles 2-3 mm, ovate-deltoid, acuminate, somewhat persistent; pedicels 5-12 mm; sepals unequal, outer ovate, obtuse and mucronate, ribbed, 8-9 mm, inner 11-12 mm, oblong-ovate, pale and ± scarious, acute to apiculate; corolla 5-8 cm long, broadly trumpet-shaped, gradually widened from base, pink, glabrous, the tube 3.5-4.5 cm, limb undulate c. 6-7 cm diam. Capsules and seeds not seen.

Illustration.

Diggs et al. (1999: 559).

Distribution.

A local endemic found on the borders of Oklahoma and Texas.

UNITED STATES. Oklahoma: Logan County, 1.25 miles S of Mulhall, R. Pearce 1799 (ARIZ); Sandy Loam, K.C. Bennett s.n. (KH); Payne County, 3 miles S. of Mulhall, J.C. Semple & K. Shea 675 (MO). Texas: Cooke County, half mile N of Dexter, R. Pearce 2081 (ARIZ).

Note.

Ipomoea shumardiana differs from I. leptophylla in the distinct leaf base. The two species intergrade and some specimens, e.g. Semple & Shea 675 are somewhat intermediate. Ipomoea shumardiana may prove to be only a form of I. leptophylla .