Ipomoea australis ( O'Donell )

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

227. Ipomoea australis ( O'Donell) J.R.I. Wood & P. Muñoz, comb. & stat. nov

urn:lsid:ipni.org:names:

Ipomoea trichocarpa var. australis O'Donell , Bol. Bot. Soc. Argent. 4: 260. 1953. ( O’Donell 1953b: 260). Type. ARGENTINA. Tucumán, Lillo 12909 (holotype LIL n.v., isotype NY00319232).

Ipomoea cordatotriloba var. australis (A. Gray) D.F. Austin , Taxon 37: 185. 1988. (Austin 1988: 185).

Type.

Based on Ipomoea trichocarpa var. australis O'Donell

Description.

Slender twining (occasionally trailing) annual herb, stems to 3 m, glabrous, thinly pilose with long white hairs or densely pubescent. Leaves petiolate, 2.5-8 × 1.5-6 cm, entire, ovate-deltoid or (very rarely) shallowly 3-lobed, narrowly cordate with rounded, entire or dentate auricles, apex shortly acuminate, mucronate, glabrous or thinly pilose on veins and margins or pubescent; petioles 0.5-5 cm, smooth. Inflorescence of axillary, pedunculate, umbelliform cymes, usually with 1-5(-9) flowers; peduncles 2-9 cm; bracteoles 5-7 mm, filiform, pilose, relatively persistent; pedicels 4-9 mm; sepals subequal, usually ciliate with stiff spreading hairs, occasionally glabrous, outer sepals 8-11 mm, ovate, gradually narrowed to an outwardly curved fine point, the central vein usually distinct, inner sepals 10-12 mm, obovate, abruptly or gradually narrowed to a mucronate apex; corolla (2.5-) 3.5-4.5 cm long, gradually widened from base, pink with a dark centre, glabrous, limb c. 2.5 cm diam., unlobed. Capsules subglobose, 7-8 mm, pilose; seeds brown, hemispherical, 3.5 mm long, glabrous.

Illustration.

Figures 5C , 116 .

Distribution.

Restricted to the Southern hemisphere where it is found in Argentina, Paraguay, Bolivia and Brazil, in the last of which it is apparently rare. Records from elsewhere require confirmation. It is a lowland species not usually found above 1000 m. See also O’Donell 1953b for numerous citations under Ipomoea trichocarpa var. australis .

ARGENTINA. Catamarca: Brizuela 124 (LIL). Chaco: A.G. Schulz 15973 (CTES). Corrientes: T.M. Pedersen 2593 (C, E, S); M. M. Arbo 718 (CTES). Formosa: I. Morel 7831 (LIL). Jujuy: A. Schinini and Vanni 22343 (CTES). La Rioja: Biurron 3309 (CTES). Salta: Oran, A. Krapovickas & G. Seijo 47683 (CTES), A. Krapovickas & A. Schinini 30456 (CTES). Tucumán: S. Venturi 4216 (LIL, LP, US).

PARAGUAY. Amambay: A. Krapovickas & A. Schinini 32661 (CTES). Caaguazú: A. Krapovickas & C. Cristóbal 44869 (CTES). Caazapá: Abai, Com. Aché de Ypetimi, P. da Motta 98 (FCQ). Central: Asunción, I. Basualdo 98 (FCQ); Patino, G.W. Teague 571 (BM); T. Morong 103 (E); Ñemby, L. Pérez et al. 13 (PY). Concepción: Loreto, M. Dematteis et al. 3149 (CTES, FCQ). Cordillera: Caacupé, E. Lurvey 274 (CTES, PY); Río Salado hacia Limpio, J.R.I. Wood et al. 28142 (FCQ). Guairá: Cordillera de Ybytyruzú, E. Zardini et al. 4237 (FCQ); Col. Independencia, J.R.I. Wood et al. 28155 (FCQ). Ñeembucú: Estancia Redondo, R. Garcia et al. 01 (FCQ). Paraguarí: Paraguarí town, J.R.I. Wood et al. 28151 (FCQ). Presidente Hayes: Est. Fortín Salazar, Laguna Carpa Cue, C. Vogt 372 (FCQ); M.M. Arbo et al. 1600 (CTES). San Pedro: N. Soria 5416 (FCQ).

BRAZIL. Mato Grosso do Sul: Fazenda Nhumirim, Corumba, A. Pott et al. 2929 (MBM).

BOLIVIA. Beni: Cercado, Casarave, M.T. Martinez & M. Adler 66 (K, LPB, USZ). Chuquisaca: E. Saravia 10851 (CTES). La Paz: Sud Yungas, bajada de Chulumani a Asunta, J.R.I. Wood et al. 20610 (BOLV, K, LPB, USZ). Santa Cruz: Germán Busch, 28 km al sur del Rincón del Tigre, J.R.I. Wood et al. 24581 (K, LPB, UB, USZ); Chiquitos, Valle de Tucuvaca, J.R.I. Wood et al. 23473 (K, LPB, UB, USZ); Cordillera, carretera entre Boyuibe y Camiri, J.R.I. Wood et al. 27629 (OXF, LPB, USZ); Florida, Los Negros J.R.I. Wood et al. 22769 (K, LPB, USZ); Ibañez, M. Nee 49030 (NY, USZ); Ichilo, Buenavista, J. Steinbach 7042 (GH, K, S). Ñuflo de Chávez, San Antonio de Lomerío, J.R.I. Wood 27756 (K. LPB, USZ). Sara, La Bélgica J.R.I. Wood 22120 (K, LPB). Velasco, Carmen Ruiz, J.R.I. Wood & D. Soto 27413 (K, LPB, USZ). Tarija: Arce, M. Coro 1174 (LIL). Gran Chaco, 19 km N. of Camatindi, M. Dematteis et al. 1949 (CTES, GH).

Notes.

Ipomoea australis usually has entire leaves (rarely 3-lobed), but never with the lobe contracted at base, pedicels almost always smooth, seeds completely glabrous. Our molecular studies give support for the recognition of I. australis as a distinct species.

Wood et al. 27611 (K, LPB, USZ) from Villamontes, Gran Chaco, appears to be I. australis but the ovary and capsules are glabrous.

Figures

Figure 5. Sepals of Ipomoea species. A Ipomoea descolei B I. paraguariensis C I. australis D I. purpurea (left), I. nil (right) E I. incarnata F I. pintoi G I. maurandioides H I. pubescens. Photographs of A by Hector Keller; B and G by T. Carruthers; C (Wood et al. 27708); E (Wood 27756) and H (Wood 27675) by Beth Williams; D by John Pink; F (Queiroz 15956) by Hibert Huaylla.

Figure 116. Ipomoea australis. A habit B leaf and peduncle C outer sepal D inner sepal E corolla opened out to show stamens F ovary and style G seed, front view H seed, side view. Drawn by Rosemary Wise A, C-H from Wood & Soto 27929; B from Pedersen 2593.