Ipomoea tehuantepecensis L. Torres, R. Torres, M.P. Ramirez & J.A. McDonald

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

182. Ipomoea tehuantepecensis L. Torres, R. Torres, M.P. Ramirez & J.A. McDonald , J. Bot. Res. Inst. Texas 2(2): 793 2008. (Torres et al. 2008: 793)

Type.

MEXICO. Oaxaca, Tehuantepec, camino al Arroyo de Las Minas, R. Torres C. & C. Martínez R. 11255 (holotype MEXU01240513; isotype MO).

Description.

Twining liana of unknown height; stems stout, woody, glabrous. Leaves deciduous before anthesis, petiolate, 5-11 × 3.5-8.5 cm, broadly ovate, acute, base truncate or subcordate and cuneate onto petiole, both surfaces glabrous, abaxially paler; petioles 3-8.5 cm. Inflorescence a many-flowered, compact, complex cymose structure; primary peduncles 1-3 mm, glabrous; bracteoles caducous, not known; secondary peduncles 6-6.5 mm; pedicels 4-6 mm, glabrous; sepals subequal, 4-4.5 × 2-3 mm, elliptic, obtuse, mucronate, reddish, glabrous, the inner slightly larger and with scarious margins; corolla 2.5-3 cm long, cylindrical-hypocrateriform, red, glabrous, limb 5-lobed, lobes 3-6 mm long and wide, recurved, stamens exserted. Capsules 9-13 × 6-7 mm, ellipsoid, glabrous; seeds 7 × 4.5 mm, pilose on angles with hairs c. 7 mm long.

Illustration.

Torres et al. (2008: 794).

Distribution.

Endemic to the area around Tehuanteptec where it prefers steep slopes in low deciduous forest up to 750 m.

MEXICO. Oaxaca: Cerro Guien Gola, P.J. Stafford et al. 8 (BM, MEXU, MO).

Note.

Distinguished from Ipomoea conzattii and I. concolor by the shorter, glabrous sepals and corolla.

• Species 183-215 are endemic to the Caribbean region. Our 605 nuclear regions sequence data suggests they form a distinct clade but our sampling is too limited to confirm this with confidence. They form the nearest thing to an island radiation within Ipomoea .