Ipomoea microsepala Benth.

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

335. Ipomoea microsepala Benth. , Bot. Voy. Sulph. 136. 1844 [pub.1845]. (Bentham 1845: 136)

Ipomoea nelsonii Rose, Contr. U.S. Natl. Herb. 1(9): 343. 1895. (Rose 1895: 343). Type. MEXICO. Colima, Manzanillo, E. Palmer 1363 (lectotype US00111426, designated here; isolectotypes BM, GH, K, NY, US).

Ipomoea amplexicaulis Fernald , Bot. Gaz. 20 (12): 535. 1895. (Fernald 1895: 535). Type. MEXICO. [Nayarit], Tepic, F.H. Lamb 576 (holotype GH00054481, isotypes F, MSC, NY, US).

Ipomoea equitans M.E. Jones, Contr. W. Bot. 15: 149. 1929. (Jones 1929: 149). Type. MEXICO. Nayarit, Tigre Mine near Acaponeta, M.E. Jones 23139 (holotype POM, now RSA0002421; isotypes CAS, GH, NY, UC, WIS).

Type.

MEXICO. Guerrero, Acapulco, Sinclair s.n. (lectotype K000612734, designated here; isolectotypes K).

Description.

Climbing herb to 4 m, stems glabrous or thinly pilose, slender or stout and woody. Leaves shortly petiolate, 3-6 × 0.7-3.5 cm, small, ovate, cordate with rounded auricles, obtuse to acuminate, mucronate, usually glabrous; petioles 0.2-1.5 cm. Inflorescence of simple or compound axillary cymes from the leaves and/or in the axils of bracts (resembling reduced leaves) in a many-flowered raceme-like axillary inflorescence up to 20 cm long; peduncles 3-5 cm, usually passing through the sinus of the leaf blade; bracteoles 1-2 mm, linear-lanceolate, deciduous; secondary peduncles 4-6 mm; pedicels 5-8 mm; sepals subequal, 2-2.5 × 1 mm, oblong-lanceolate, acute or obtuse, margins white, glabrous; corolla 2.5-3 cm long, yellow, glabrous, funnel-shaped, limb prominently flared and deeply lobed. Capsules 4-6 mm, globose, glabrous; seeds 2-3 mm, puberulent.

Distribution.

Scrub at low altitudes below 1000 m in central and southern Mexico and neighbouring parts of Guatemala.

GUATEMALA. Bernoulli & Cario 1923 (K).

MEXICO. Chiapas: Cacahoatán, D.E. Breedlove 42584 (CAS, MO). Colima: type of Ipomoea nelsonii . Durango: Chacala, E.A. Goldman 339 (BM, US). Guerrero: Montes de Oca, G.B. Hinton 11658 (GBH, K); Atoyac de Alvarez, G.B. Hinton 11002 (GBH, K, MO); Petatlán, J.C. Soto Nuñez et al. 12091 (MEXU). Michoacán: Huetamo, G.B. Hinton 5510 (K); Lázaro Cárdenas, J.C. Soto Nuñez et al. 2745 (MEXU). Oaxaca: Tuxtepec, E.W. Nelson 318 (US); Pochutla, S.H. Salas et al. 3638 (MEXU); Tehuantepec, M. Elorsa 4285 (MEXU). Sinaloa: Sierra Tacuichamona, H.S. Gentry 5561 (MEXU, MO); Concordia, T.R. Van Devender et al. 2006-192 (MEXU). Veracruz: La Lima, M. Nee 23777 (BM); Cosamaloapan, Martínez Calderon 1323 (BM, F, GH, K, MEXU, MO).

Typification.

There are three sheets of the type collection of Ipomoea microsepala at K, of which the sheet with bar code 000612734 was annotated as holotype by McDonald. Since there seems no particular reason why this sheet was identified as the holotype in preference to the others, we are here lectotypifying it to remove any uncertainty.