A foundation monograph of Ipomoea (Convolvulaceae) in the New World Author Wood, John R. I. Author Munoz-Rodriguez, Pablo Author Williams, Bethany R. M. Author Scotland, Robert W. text PhytoKeys 2020 143 1 823 http://dx.doi.org/10.3897/phytokeys.143.32821 journal article http://dx.doi.org/10.3897/phytokeys.143.32821 1314-2003-143-1 F6F11A6EE4FF5A1885CEA2B60AE965A5 117. Ipomoea pauciflora M. Martens & Galeotti , Bull. Acad. Roy. Sci. Bruxelles 12 : 266. 1845. (Martens and Galeotti 1845: 266) Ipomoea vargasiana O'Donell , Bol. Soc. Peru. Bot. 1 : 5. 1948. ( O'Donell 1948b: 5). Type. PERU. Cuzco, Anta, C. Vargas 1021 (holotype LIL001357, isotypes CUZ, MO). Ipomoea pauciflora subsp. vargasiana ( O'Donell ) McPherson , Ann. Missouri Bot. Gard. 68 (4): 537. 1981. (McPherson 1981: 537). Type. MEXICO. Oaxaca, H. Galeotti 1403 (holotype BR00006972660, isotype fragments BM, P). Description. Tree or more commonly shrub to 7 m, variable in habit, with arching branches, often near leafless when flowering, stems glabrous, bark light brown, latex present, white. Leaves petiolate, 4-10 x 2.3-6 cm, ovate, finely acuminate and mucronate, truncate to very shallowly cordate, glabrous; petioles 1.5-5 cm. Inflorescence of shortly pedunculate, 1-3-flowered cymes often borne on small axillary side branches; peduncles 0.2-3 cm; bracteoles 3 mm, oblong, caducous; pedicels 20-32 mm, thickened upwards; sepals subequal, abaxially glabrous, adaxially pubescent, the margins scarious, outer 9-11 x 6-8 mm, oblong-ovate, acute, often mucronate, inner sepals similar but scarious margins broader; corolla 5-7.5 cm long, white, broadly funnel-shaped, glabrous, tube commonly reddish inside, limb 7 cm diam., undulate; stamens 9-12 mm long; stigmas cylindrical, c. 2.5 mm long. Capsules 18-22 x 10-12 mm, ellipsoid glabrous; seeds 10-11 x 5 mm, glabrous apart from the pilose margins, the hairs white c. 9-12 mm long. Illustration. Figures 3A , 52D . Distribution. Seasonally dry deciduous woodland mostly between 1000 and 2600 m from southern Peru north to southern Mexico. PERU. Ayacucho : Weberbauer 5665 (US), 5667 (US), 5899 (US); La Mar, J. Roque & C. Arana 3120 (USM). Apurimac : Abancay, E.K. Balls 6838 (BM, F, K, US); Grau, C. Vargas 5814 (CUZ). Cusco : Anta, Limatambo, H. Galiano 5723 (MO); ibid., Mollepata, L. Valenzuela et al. 9774 (MO, OXF); ibid., W. Galiano et al. 5159 (MO). Huancavelica : K.G. Dexter et al . 6495 (E); Colcabamba, O. Tovar 2117 (USM). Tumbes : Cerros de Amotape, A. Gentry et al. 58318 (MO) fide D. Austin. ECUADOR. Loja : G. Harling et al. 15403 (AAH, GB); Catamayo valley, L. J. Dorr & I. Valdespino 6643 (QCNE). COLOMBIA. Boyaca : Chicamocha valley, R. Jaramillo & T. van der Hammen 4238 (COL, MA). NICARAGUA. Fide Austin et al. (2012). HONDURAS. Fide Austin et al. (2012). GUATEMALA. Fide Austin et al. (2012). MEXICO. Chiapas : Tzimol, A. Reyes-Garcia & E. Martinez 203 (BM, MO); D.E. Breedlove 22952 (F). Est. Mexico & Dist. Fed. : Cult. in Jardin Botanico , A. Garcia 4435 (MEXU): Temascaltepec, Luvianos, G.B. Hinton et al. 5305 (BM, K), ibid., 8754 (K). Guerrero : near Acapulco, E. Palmer 619 (BM, K, MICH); Rincon de la Via , E. Matuda 37249 (MEXU); Xalpatlahuac, C. Toledo & R. Landa 548 (MEXU). Jalisco : D. Neill 5322 (MEXU). Morelos : Cuenavaca, E. Bourgeau 1407 (P, S); Temisco, M.T. German & V. Funk 595 (MEXU); Yautepec, R. Quezada 1915 (MEXU). Oaxaca : Cuicatlan , J.I. Calzado 24340 (K, MEXU); Santiago Chazumba, J.I. Calzado 24479 (K, MEXU); Mount Alban , C.G. Pringle 4965 (BM, E, K, MICH, S); Ixtaltepec, C. Martinez 1262 (MEXU). Puebla : Tehuacan , J.I. Calzado & A. O. Lopez 22909 (K, MEXU); Juan N. Mendez , J.I. Calzada 24328 (K, MEXU); Ahuehuetitla, S. Zamudio O. Ocampo 10981 (IEB, MEXU). Notes. McPherson (1981) recognised two subspecies but these are poorly defined morphologically and are not recognised here. In any case this species is not always easily separable from Ipomoea wolcottiana or I. populina , the former differing in the often obscurely pubescent sepals and the latter in the liana habit. The record of Ipomoea pauciflora M. Martens & Galeotti subsp. vargasiana in Austin and Huaman (1996) from Bolivia is presumably an error as we have been unable to trace any collection or literature reference.