Ipomoea megapotamica subsp. megapotamica

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

61a. Ipomoea megapotamica subsp. megapotamica

Ipomoea megapotamica var. cordifolia Hassl. , Repert. Spec. Nov. Regni Veg. 9: 157. 1911. (Hassler 1911: 157). Type. PARAGUAY. Concepción, Naranjati, Hassler 10401 (lectotype G00175106, designated here).

Ipomoea riograndensis P.P.A. Ferreira & Miotto , Kew Bull. 66 (2): 290. 2011. (Ferreira and Miotto 2011: 290). Type. BRAZIL. Rio Grande do Sul, Puerto Alegre, P.P.A. Ferreira 118 (holotype ICN; isotypes K, LIL, SP).

Diagnosis. This subspecies is distinguished by its leaves, which are abaxially glabrous to thinly pubescent. The sepals are relatively long, usually 6-7.5 mm in length.

Distribution.

Found around the north and east of the Chaco in Bolivia, Paraguay and Brazil and, like a number of Chaco species, also present in NE Brazil. In Bolivia it has been mostly found at low altitudes along the line of the new road from Santa Cruz to Brazil and was notably more common immediately following its construction, becoming less common in subsequent years.

ARGENTINA. Salta: Rivadavia, A. Maranta & P. Arenas 118 (CTES); ibid., M.E. Suarez 12 (CTES).

PARAGUAY. Alto Paraguay: Fortín Teniente Martínez, Fernández Casas & Molero 4302 (G, MA, NY); P.N. Defensores del Chaco, E. Zardini & J. Godoy 50415 (ARIZ, MO); ibid., F. Mereles et al. 8899 (FCQ). Amambay: Cerro Corá, Fernández Casas & Molino 6017 (G, NY), ibid., 6081 (G, NY); Krapovickas & Cristóbal 44944 (CTES, FCQ), 45042 (CTES, FCQ). Boquerón: Filadelfia, R.O. Vanni et al. 2521 (CTES, G); Colonia Fernheim, P. Arenas 3311 (FCQ). Presidente Hayes: Com. Armonia, O. Aquino et al. 436 (FCQ); camino a Riacho González, R. Degen 3467 (FCQ). San Pedro: Com. 25 de Diciembre, J.R.I. Wood & G. González 28471 (FCQ).

BRAZIL. Dist. Fed.: Irwin et al. 12043 (NY, MO). Mato Grosso do Sul: V.J. Pott 229 (CPAP, CTES); Rondonopolis, G. Hatschbach 34061 (CTES). Minas Gerais: Ituiutaba, A. Macedo 673 (S), 1701 (MO, RB). Pernambuco: E.P. Heringer et al. 478 (RB, UB); P. Gomes 463 (RB). Rio Grande do Norte: A.C. Sarmento 761 (NY, RB). Rio Grande do Sul: type of Ipomoea riograndensis . Sergipe: R. Simão-Bianchini 1757 (ASE).

BOLIVIA. Santa Cruz: Chiquitos, San José de Chiquitos, J.R.I. Wood et al. 22862 (HSB, K, LPB, USZ); Germán Busch, Rincón del Tigre, J.R.I. Wood et al. 27269 (K, LPB, USZ); ibid., near Puerto Suárez, J.R.I. Wood & D. Villarroel 25516 (K, LPB, UB, USZ). Tarija: Gran Chaco, near Palos Blancos, J.R.I. Wood et al. 27617 (OXF, LPB, USZ).