Ipomoea cuprinacoma E. Carranza

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

134. Ipomoea cuprinacoma E. Carranza & J.A. McDonald, Lundellia 7: 1. 2004. (Carranza and McDonald 2004: 1)

Type.

MEXICO. Michoacán, Mun. Penjamillo, E. Carranza 5608 (holotype IEB000187865, isotypes ENCB, IEB, MEXU, TEX).

Description.

Robust trailing or twining liana; stems to 14 m, canescent when young but glabrescent. Leaves petiolate, 7-14 × 4-10 cm, base truncate or cordate, apex acuminate, adaxially green, thinly to densely pubescent, abaxially grey-tomentose with some hairs reported to be branched; petioles 2.5-11 cm, pubescent. Inflorescence of pedunculate, axillary 1-3(-5)-flowered cymes, sometimes developing on short branchlets; peduncles (0.5-)1-5.5 cm, densely grey-canescent or subtomentose, somewhat glabrescent; bracteoles lanceolate, 2 mm long, grey-canescent; secondary peduncles c. 1 cm, noticeably less hairy than peduncles; pedicels 0.5-2.5 cm, densely puberulent; sepals somewhat unequal, coriaceous with pale scarious margins, glabrous; outer 5.5-8 × 4-6 mm, obtuse, inner 8-12 × 6-9 mm, truncate; corolla 5.5-8 cm long, funnel-shaped, white with purple throat, glabrous, limb shallowly lobed, c. 4-4.5 cm diam. Capsules 10-17 × 8-12 mm, ellipsoid, glabrous; seeds 7-12 mm long, glabrous apart from the pilose margins with brownish hairs 10-14 mm long.

Illustration.

Figure 79 ; Carranza and McDonald (2004: 2); Carranza (2007: 39).

Distribution.

Endemic to central Mexico and apparently uncommon to dry forest mostly between 1000 and 2000 m.

MEXICO. Colima: B.M. Rothschild & T. Upson 352 (A); L. Vazquez & B.L. Phillips 799 (A). Guerrero: Vallecito de de Zaragoza, J.C. Soto Nuñez et al. 9711 (MEXU); H. Iltis et al. 28692 (IEB, TEX). Jalisco: Jacotepec, Sierra La Difunta, J.A. Macuca 7220 (IEB, MICH); Zapopan, P. Carrillo-Reyes 2319 (IEB). Michoacán: Tzitzio, E. Carranza & I. Silva 6786 (IEB); Churintzio, Sanguijelas, J.N. Labat 1834 (IEB, MEXU, P); C. Feddema 51 (MICH); Mina, G.B. Hinton et al. 10519 (GBH, K); Penjamillo, Cuesta del Platanal, H. Díaz & E. Pérez 7242 (IEB). Sinaloa: 35 miles E. of Villa Union, R.L. Oliver et al. 750 (MO).

Note.

Although Carranza and McDonald place this species in the Arborescens group and compare it with Ipomoea populina House , this is incorrect as it clearly belongs to Clade A2. Neither the purple fruit nor the arborescent habit are obvious in herbarium specimens but specimens are usually easily identified by the large, entire leaves, which are subtomentose abaxially, the pubescent peduncles and young stems, and the few-flowered lax inflorescence. There is some variation in indumentum, some specimens being adaxially (as well as abaxially) hirsute. Zamudio & Pérez 10032 (IEB) from Arroyo Toliman, Mun. Zimapan (Hidalgo) looks like a glabrous form of Ipomoea cuprinacoma .

Figures

Figure 79. Ipomoea cuprinacoma. A habit B adaxial leaf surface C abaxial leaf surface D outer sepal E inner sepal F inflorescence G corolla opened out to show stamens. Drawn by Rosemary Wise A, B, F, G from Rothschild 352; C, D from Macuca 7220; E from Labat s. n.