125. Ipomoea murucoides Roem. & Schult., Syst. Veg. 4: 248. 1819. (Roemer and Schultes 1819: 248)

Convolvulus macranthus Kunth, Nov. Gen. Sp. 3: 95. 1818 [pub.1819]. (Kunth 1819: 95). Type. MEXICO. Guanajuato, Humboldt & Bonpland s.n. (holotype P00670732).

Ipomoea macrantha (Kunth) G. Don, Gen. Hist. 4: 267. 1838. (Don 1838: 267), nom. illeg., non Ipomoea macrantha Roem. & Schult. (1819) .

Convolvulus quahutzehuatl Sesse & Moc. , Pl. Nov. Hisp. 23. 1887 [pub.1888]. ( Sessé y Lacasta and Moçiño 1887-90: 23). Type. MEXICO. Sessé & Moçiño s.n. (holotype MA00603845).

Convolvulus arboreus Sesse & Moc . , Pl. Nov. Hisp. 23. 1887 [pub. 1888]. ( Sessé y Lacasta and Moçiño 1887-90: 23). Type. MEXICO. Sessé & Moçiño s.n. (MA00603835, lectotype designated here; isolectotypes BM, F, MA).

Type.

A cultivated plant "e horto valentino" (whereabouts unknown).

Description.

Tree to 13 m high, trunk to 40 cm diam., white latex abundant, stems floccose with white hairs. Leaves petiolate, 9-20 × 1-7 cm, lanceolate, oblong-lanceolate to ovate, acuminate, base broadly cuneate, usually villous or pubescent when young, somewhat glabrescent; petioles 1-6 cm, tomentose, glabrescent. Inflorescence terminal or from upper leaf axils, laxly corymbose in structure; peduncles 0.3-2 cm, villous; bracteoles ovate, obtuse 10-15 × 5-10 mm, caducous; pedicels 1.5-5 cm, thickened upwards, more densely tomentose than peduncles; sepals slightly unequal, 14-28 × 9-20 mm, oblong-ovate, obtuse to subacute, white-tomentose, the inner slightly shorter but more densely tomentose; corolla 6-9 cm long, funnel-shaped, white with dull red throat, villous; limb c. 5 cm diam., undulate. Capsules 2-2.5 cm long, oblong-ellipsoid, glabrous; seeds 12 × 5 mm, pilose on the margins with hairs 10-15 mm long.

Illustration.

Carranza (2007: 75). Figures 3E, 11B, 76.

Distribution.

Dry scrub and open deciduous woodland from 600 to 2400 m from central Mexico south to Guatemala.

GUATEMALA. J. Castillo 1661 (F); J. Donnell Smith 1863 (K); Santa Rosa, Heyde & Lux 4733 (K); Guatemala City, O. & I. Degener 26487 (BM); Huehuetenango, A.F. Skutch 1938 (BM); Jalapa, B.T. Styles 141 (FHO).

MEXICO. Aguascalientes: Aguascalientes-Calvillo, J.S. Miller et al. 355 (MO, MEXU). Chiapas: D. E. Breedlove & R.F. Thorne 21298 (MO). Durango: O.H. Soule 2076 (MO). Est. México & Dist. Fed.: Mont de Guadelupe, E. Bourgeau 790 (BM, P, S); Ayotzingo, Chalco, A. Ventura 4351 (MEXU). Temascaltepec, G.B. Hinton 2786 (BM, K); ibid., San Lucas, G.B. Hinton 8755 (K). Guanajuato: Cerro Las Tetillas, G. Ibarra Manríquez & G. Cornejo Tenorio 6796 (MEXU, MO); Irapuato, E. Martínez & C.H. Ramos 39679 (MEXU). Guerrero: J.C. Soto & E.M. Martínez 3994 (MEXU, MO); San Pedro Atengo, R. Cruz Duran 2139 (MEXU). Hidalgo: J.L. Flores s.n. (MEXU). Jalisco: Tapalpa, E.J. Lott & J.A. Solis Magallanes 755 (MEXU, MO); ibid., H.H. Iltis et al. 816 (K, MEXU). Michoacán: Zitácuaro, J.C. Soto & S. Aureoles 7232 (BM, MEXU); Coalcomán, G.B. Hinton 12692 (K). Morelos: Cuernavaca-Cautla, T. Croat & D.P. Hannon 65738 (MEXU, MO). Nayarit: El Ocote, Sw of Yxtlan, Y. Mexia 800 (BM, MO). Oaxaca: C.A. Pringle 6066 (BM, K, MO, S); Santiago Chazumba, J.I. Calzada 24331 (K, MEXU); M. O. Dillon 683 (F); Zimatlan, A. Miranda & O. Hernández 694 (MEXU). Puebla: Tepoxuchil, F. Nicholas 622 (K); Cerro Toltepec, J.L. Contreras 7537 (MEXU). Querétaro: E. Carranza & A. Amador 4943 (MEXU); Los Cues, E. Argüelles 1933 (FTG, MEXU). Zacatecas: Coulter 1023 (K); Zapoqui, T. Croat 45088 (MEXU, MO); Villanueva, E.B. Enriquez 376 (MEXU).

Note.

Perhaps the most distinct of the Arborescens Clade because of the dense, white, woolly stem indumentum, large sepals and broadly cuneate leaf bases.