Ipomoea teotitlanica McPherson

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

126. Ipomoea teotitlanica McPherson , Contr. Univ. Mich. Herb 14: 85. (McPherson 1980: 85)

Type.

MEXICO. Oaxaca, Teotitlan Dist., Tambor, 17 miles W of San Antonio, H.S. Gentry 22475 (holotype A00054546, isotypes ARIZ, MEXU).

Description.

Small tree with grey trunk to 5 m high, stem and branchlets woody, tomentose with white hairs, eventually glabrescent. Leaves rather shortly petiolate, 2-5 × 1.4-5.7 cm, suborbicular, cordate, rounded to retuse, tomentose on both surfaces, adaxially grey-green abaxially white; petioles 5-16 mm, tomentellous. Flowers solitary, axillary; peduncles 0-1 mm; bracteoles 1-1.5 mm, ovate, deciduous; pedicels 4-15 mm, tomentose; sepals subequal, 11-16 × 7-10 mm long, the outer ovate, acute, abaxially tomentose, inner elliptic obtuse, only the midrib tomentose, the margin scarious; corolla 5-6 cm long, funnel-shaped, pale yellow, glabrous. Capsules narrowly ovoid, glabrous; seeds with long, lanate hairs.

Illustration.

McPherson (1980: 86).

Distribution.

Endemic to Oaxaca and neighbouring Puebla in Mexico, recorded as growing on steep sandstone slopes.

MEXICO. Oaxaca: Teotitlan de Flores Magon, J.I. Calzada 24325 (MEXU, K), ibid., 24320 (K, MEXU); ibid., El Tambor, G. Murguía s.n. [17/1/1991] (IEB). Puebla: Tehuacan-Oaxaca, M. Cházaro & B.L. Mosthul 7703 (IEB).