Ipomoea amnicola subsp. amnicola

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

340a. Ipomoea amnicola subsp. amnicola

Ipomoea nuda N.E. Br. Trans. & Proc. Bot. Soc. Edinb. 20: 63. 1894, nom. illeg., non Ipomoea nuda Peter 1891 . (Brown, NE: 1894: 63). Type. PARAGUAY. RVo Pilcomayo. J.G. Kerr 12 (not found at K).

Diagnosis. Inflorescence of usually rather dense axillary cymes; peduncles 1-5 cm; outer sepals 4-5 mm long, inner sepals 5-5.5 mm long; corolla 2-3 cm long, pale lilac with dark centre, the limb 2.5-3 cm diam; seeds 5 × 2.5 mm.

Illustration.

Figures 2G , 141E , 162 .

Distribution.

This subspecies has an amphitropical distribution being found in the southern United States and South America. In South America it is most common as a species of dry Chaco scrub near the Andes in western Argentina, western Paraguay and southern Bolivia but penetrates the Andean cordillera along dry river valleys. It also occurs in dry areas of NW Peru and neighbouring parts of Ecuador and in the upper Magdalena valley in Colombia. In the United States it is perhaps introduced and is most common in the Rio Grande region of Texas. No records from Mexico have been traced.

ARGENTINA. Catamarca: Brizuela 626 (LIL); Pomán, P.D. Cantino 807 (CORD, GH). Chaco: C. O’Donell 5563 (LIL). Córdoba: Cuezzo 903 (LIL); Pocho, A.T. Hunziker & J.A, Caro 13477 (CORD). Corrientes: T.M. Pedersen 3866 (C, P, S); A. Schinini 4470 (ASU, CTES). Formosa: S. Pierotti 4175 (LIL, P). Jujuy: A.L. Cabrera 34061 (MO). La Rioja: Stucker 17135 (LIL); General Ángel Peñalosa, A.T. Hunziker et al. 15117 (CORD, MO). Salta: L.J. Novara et al. 8901 (S). Santa Fe: S. Venturi 297 (LIL). Santiago del Estero: T. Meyer 17076 (LIL).

PARAGUAY. Chaco región. Alto Paraguay: F. Mereles 6728 (FCQ). Boquerón: F. Mereles & R. Degen 5150 (FCQ), 5680 (FCQ), 5948 (CTES, FCQ). Central: E. Zardini 2674 (FCQ, MO). Paraguarí: Carpegua, T. Rojas 3371 (S). Presidente Hayes: Maroma, M. Peña-Chocarro et al. 1918 (BM, 2556 (BM); F. Mereles & R. Degen 6425 (FCQ).

BRAZIL. Mato Grosso do Sul: Faz. Uberaba, J. Almeida de Jesus 1735 (RB); Estrada Pantaneira, E.P. Heringer 831 (NY).

BOLIVIA. Inter-andean dry valleys and chaco. Chuquisaca: 100 km E of Boyuibe, B. Mostacedo & T.J. Killeen 354 (NY, LPB, USZ); Zudañez, Puente Inca, J.R.I. Wood et al. 2724 (K, LPB, USZ). Cochabamba: Campero, Puente Arce, J.R.I. Wood 28119 (K, OXF, USZ). La Paz: Sud Yungas: S.G. Beck 22444 (K, LPB); Tamayo, ANMI Madidi, A. Araujo-M et al. 2869 (LPB, MO). Potosí: Charcas, Río Caine bridge, J.R.I. Wood et al. 23244 (K, LPB). Santa Cruz: Ángel Sandoval, Candelaria, J.R.I. Wood et al. 24870 (K, LPB, UB, USZ). Chiquitos, Taperas: J.R.I. Wood et al. 27873 (K, LPB, USZ). Caballero: La Palisada, J.R.I. Wood & A. Haigh 21839 (K, LPB, P); Cordillera, Abapó, J.R.I. Wood & F. Mamani 27484 (K, LPB, USZ). Ibañez, M. Nee 49480 (LPB, MO, NY, USZ); Ñuflo de Chávez, San Julián, J.R.I. Wood & D. Soto 27947 (K, LPB, OXF, USZ); Vallegrande, Río Grande, G.A. Parada et al. 4387 (MO, USZ). Tarija: Gran Chaco, Palos Blancos, J.R.I. Wood et al. 28028 (LPB, OXF, USZ).

PERU. Amazonas: Río Chamaya, Bagua-Olmos, T. Croat 58302 (MO). Cajamarca: T. Croat 58367A (MO); P.C. Hutchison & J.K. Wright 6734 (F, UC). Lambayeque: Llatas Quiroz 2402 (F).

ECUADOR. Loja: La Toma-El Tambo, J.E. Madsen et al. 7772 (AAU).

COLOMBIA. Upper Magdalena Valley. Huila: F.R. Fosberg 19610 (US). Tolima: Honda, E. André 561 (K).

UNITED STATES. Georgia: Spalding County, W. Hardcastle s.n. (GA); Missouri: Jackson, B.F. Bush 9691 (BM, MO). Texas: Cameron County, R. Runyon 2916 (BM), 2904 (S); Hidalgo County, E.U. Clover 301 (MEXU); Kleberg County, W.R. Carr 25097 (MEXU).

Typification.

There are two sheets of Morong 974 at NY. We have selected the best of these as lectotype, rather than the sheet labelled as holotype in an unknown hand as this lacks most diagnostic details.

Note.

In the field Ipomoea amnicola (especially subsp. amnicola ) is usually easily recognised by the relatively small corolla which is pale pink with a dark centre. It often blankets shrubs and small trees where it occurs. The leaves are quite glabrous, usually somewhat glaucous and slightly fleshy. It is not a very easy plant to dry successfully so leaves are often deciduous on herbarium specimens. It can be confused rather easily with species from the Batatas Clade.

Figures

Figure 2. Sepals of Ipomoea species. A I. setifera B I. dumetorum C I. aristolochiifolia D I. crinicalyx E I. plummerae F I. bahiensis G I. amnicola H I. appendiculata. Photographs of A (Wood et al. 27771) B (Wood et al. 27654) D (Wood et al. 27606) and G (Wood et al. 27706) by Beth Williams C (Wood 27926) H (Wood et al. 28024) by John Wood E by Mario Giorgetta F (Queiroz et al. 15950) by Hibert Huaylla.

Figure 141. Photographs of Ipomoea species A I. plummerae, form with entire leaves B I. plummerae, form with lobed leaves C I. longeramosa D I. costellata E I. amnicola F I. paludicola G I. chondrosepala. A, B Mario Giorgetti C Rosemary Clegg D Firefly Forest E-G Maira Martinez.

Figure 162. Ipomoea amnicola subsp. amnicola. A habit B outer sepal C inner sepal D corolla opened out to show stamens E ovary and style F habit with capsules G seed. Drawn by Rosemary Wise A-E from Wood & Mamani 27484; F-G from Wood & D. Soto 27947.