Ipomoea murucoides Roem. & Schult.

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

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.

Figures

Figure 3. Sepals of Ipomoea species. A I. pauciflora B I. bernoulliana C I. tentaculifera D I. hartwegii E I. murucoides F I. pantanalensis G I. hederacea H I. funis. Photographs of A (Harling et al. 15403) B (Standley 27496) C (Pringle 6702) D (Santos Martinez 2228 E (Pringle 6066) F (Pott 6399) G (McCarthy s. n.) H Andrieux 600 by John Baker.

Figure 11. Seeds of Ipomoea A I. peteri B I. murucoides C I. carolina D I. eggersiana E I. longibarbis (with and without marginal hairs) F I. clavata G I. violacea H I. acanthocarpa J I. parvibracteolata K I. meyeri L I. jujuyensis M I. cholulensis N I. minutiflora P I. tiliacea. A from Wallnoefer & Tut-Tesucun 9662; B from Pringle 6066; C from Gillis 12906; D from Urote 35; E from Killeen et al. 4199; F from Fuentes & Miranda 10895; G from Stearn 322; H from Wurdack & Monachino 39830; J from Silva et al. 18; K from Smith 1573; L from Rose et al. 23251; M from Hinton 11166; N from Stevens & Montiel 26592; P from Curtiss 249. Drawn by Rosemary Wise.

Figure 76. Ipomoea murucoides. A habit B abaxial leaf surface C outer sepal D middle sepal E inner sepal F inflorescence G seed. Drawn by Rosemary Wise A, B from Soto 7232; C-E from Skutch 1938; F, G from Pringle 6066.