Ipomoea pauciflora M. Martens & Galeotti

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

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 × 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 × 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 × 10-12 mm, ellipsoid glabrous; seeds 10-11 × 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. Boyacá: 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-García & E. Martínez 203 (BM, MO); D.E. Breedlove 22952 (F). Est. México & Dist. Fed.: Cult. in Jardín Botánico, 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); Rincón de la Vía, 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. Germán & V. Funk 595 (MEXU); Yautepec, R. Quezada 1915 (MEXU). Oaxaca: Cuicatlán, J.I. Calzado 24340 (K, MEXU); Santiago Chazumba, J.I. Calzado 24479 (K, MEXU); Mount Albán, C.G. Pringle 4965 (BM, E, K, MICH, S); Ixtaltepec, C. Martínez 1262 (MEXU). Puebla: Tehuacán, J.I. Calzado & A. O. López 22909 (K, MEXU); Juan N. Méndez, 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.

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 52. Photographs of Ipomoea species. A I. calyptrata B I. carnea subsp. fistulosa C I. brasiliana var. subincana D I. pauciflora E I. juliagutierreziae. A Beth Williams; B, C E John Wood; D Dick Culbert.