Ipomoea shumardiana (Torr.) Shinners

Wood, John R. I., Munoz-Rodriguez, Pablo, Williams, Bethany R. M. & Scotland, Robert W., 2020, A foundation monograph of Ipomoea (Convolvulaceae) in the New World, PhytoKeys 143, pp. 1-823 : 1

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 .