250. Ipomoea mairetii Choisy in A.P. de Candolle, Prodr. 9: 374. 1845. (Choisy 1845: 374)

Calonyction venustum M. Martens & Galeotti, Bull. Acad. Roy. Sci, Bruxelles 12 (2): 270. 1845. (Martens and Galeotti 1845: 270). Type. MEXICO. Tabasco, J.J. Linden 306 (holotype GENT n.v., isotype BR000006973339).

Ipomoea venusta (M. Martens & Galeotti) Hemsl. ex Godman & Salvin, Biol. Cent.-Amer., Bot. 2 (11): 395. 1882. (Hemsley 1882: 395).

Type.

MEXICO. Mairet s.n. (holotype G-DC, not found).

Description.

Climbing or trailing liana to 7 m, stems stout, densely hirsute. Leaves petiolate, 8-20 × 7.5-16 cm, large, ovate-suborbicular, shortly acuminate, cordate with rounded auricles, adaxially thinly pubescent to strigose, abaxially densely grey-tomentose; petioles 2.5-4 cm densely pubescent. Inflorescence of few-flowered long-pedunculate axillary cymes; peduncles 1.5-20 cm, tomentose; bracteoles 2-3 × 0.5-1.5 cm, ovate to narrowly elliptic, obtuse, pubescent, persistent; secondary peduncles 0.5-3 cm; pedicels 5-15 mm, tomentose; sepals equal, 16-22 × 7-11 mm, oblong-ovate, tomentellous, obtuse, somewhat accrescent in fruit; corolla 4-5.5 cm long, pubescent, narrowly funnel-shaped, tube white, limb reddish purple, 5-6 cm diam.; stigma 3-lobed. Capsules subglobose, 1.2-1.5 cm, glabrous, six-seeded; seeds 5-7 mm, minutely puberulent.

Illustration.

McDonald (1994: 71).

Distribution.

Dry oak woodland below 1600 m from central Mexico south to Honduras.

HONDURAS. Comayagua, A. & A.R. Molina 34235 (MO).

GUATEMALA. Chimaltenango, P.C. Standley 80879 (F).

MEXICO. Chiapas: Matuda 18471 (MEXU); Santa Rosa, Heyde & Lux 4350 (K). Durango: Hendricks 695 (MO). Guerrero: Mun. San Luis Acatlán, E. M. Martínez & B. Morales 3470 (MO); Mochitlán, Agua de Obispo, H. Kruse 963 (IEB). Michoacán: Chinicuila, I.G. Hernández s.n. [7/3/2009] (IEB). Nayarit: Mesa del Nayar, O. Téllez et al. 12138 (MO). Oaxaca: Putla de Guerrero, T. Croat 45854 (MO); Sierra San Pedro C. Jürgensen 551 (BM, K, OXF); Cafetal Concordia, Morton & Makrinius 2507 (US, MICH); San Miguel del Puerto, Rancho Oreeja de León, J. Pascual 2022 (IEB). Sinaloa: Ocarahui, Sierra Surutato, H.S. Gentry 6250 (ARIZ, MO). Veracruz: Hahn s.n. (P); Valle de Córdoba, Bourgeau 1738 (BM, K, P, S); Mirador, J. Linden 1119 (K); Orizaba, J. Ball s.n. (K); Zacualpan, C.A. Purpus 2391 (BM, MO).

Note.

Not unlike Ipomoea temascaltepecensis but more hirsute generally, the leaves tomentose beneath and sepals subequal.