Ipomoea robinsonii House

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

174. Ipomoea robinsonii House , Ann. New York Acad. Sci. 18 (6): 257. 1908. (House 1908b: 257)

Type.

MEXICO. Morelos, Cuernavaca, C.G. Pringle 7338 (holotype GH00054536, isotypes ARIZ, CAS, MICH, NY, US).

Description.

Liana; stems all woody, glabrous. Leaves petiolate, 6-10 × 2.3-3.8 cm, oblong-elliptic, obtuse or acute, mucronulate, base broadly cuneate to subtruncate, glabrous, abaxially paler; petioles 1-1.8 cm. Inflorescence of solitary flowers arising on short axillary shoots; peduncles 2-8 mm; bracteoles 15-26 mm, oblong or oblong-elliptic, acute, foliose, shortly petiolate (to 2 mm), persistent; pedicels 1-2 mm; sepals strongly coriaceous, glabrous, slightly unequal, outer 8 × 6 mm, elliptic, acute, convex, inner similar but 9-10 mm long; corolla 7-8 cm long, funnel-shaped, cream (?), glabrous, limb c. 3.5 cm. Capsules 15 × 7 mm, narrowly ovoid, glabrous, rostrate with mucro c. 7 mm; seeds 8 × 2-3 mm, pilose with long marginal hairs 10-12 mm in length.

Distribution.

Endemic to southern Mexico, where it grows in deciduous tropical forest up to 1000 m.

MEXICO. Colima: Ixtlahuacan, E.J. Lott et al. 1929 (MEXU, MO). Est. México & Dist. Fed.: Temascaltepec, G.B. Hinton 6543 (K, MO). Guerrero: Mun. Coahuayutla, Y. Ramírez-A et al. 766 (ARIZ, IEB, MEXU); Cerro El Cigarillo, J.C. Soto Nuñez 16295 (MEXU). Jalisco: La Manzanilla, R. McVaugh 20959 (MICH). Michoacán: Mun. Churumuco, V. W Steinmann & Y. Ramírez-A 5881 (ARIZ, IEB); Aguila, E. Carranza & I. Silva 6806 (IEB); Lázaro Cárdenas, Alta de la Barranca, E. Carranza & I. Silva 6816 (IEB, MEXU). Oaxaca: Santa María Huatulco, A. Sánchez Martínez & A. Ruíz 1071 (IEB, MEXU). Puebla: Pollatzin, F. Miranda 2945 (MEXU).

• Species 175-177. These three species form a group diagnosed by their woolly seeds and strongly discolorous leaves. ITS sequence data suggests Species 178-179 are also members of this clade although the seeds differ.