Ipomoea elongata Choisy in A.P. de Candolle

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

301. Ipomoea elongata Choisy in A.P. de Candolle , Prodr. 9: 355. 1845. (Choisy 1845: 355)

Calonyction dubium M. Martens & Galeotti , Bull. Acad. Roy. Sci. Bruxelles 12: 268. 1845. (Martens and Galeotti 1845: 268). Type. MEXICO. Oaxaca, Misteca-Alta et Yavezia, H. Galeotti 1362 (lectotype BR00006972943, designated here; isolectotypes BR, G).

Ipomoea dubia (M.Martens & Galeotti) Hemsley, Biol. Centr. -Amer., Bot. 2: 286. 1882. (Hemsley 1882: 286), nom. illeg., non Ipomoea dubia Roem. & Schult. (1819) .

Ipomoea mestecensis House , Bot. Gaz. 43: 411. 1907. (House 1907b: 411). Type. Based on Calonyction dubium M. Martens & Galeotti

Type.

MEXICO. Oaxaca, Andrieux 212 (holotype G00135527, isotype K).

Description.

Trailing or twining perennial, stems slender, nearly glabrous. Leaves petiolate, 2.3-5.5 × 1-2 cm, deltoid, acuminate to an aristate point, base sagittate with elongate, lanceolate or ovate, acute, sometimes bifurcate auricles, margin entire, undulate or with a few broad teeth, both surfaces glabrous to thinly pubescent, abaxially paler; petioles 1-3 cm, thinly pubescent. Inflorescence of solitary (rarely paired) pedunculate, axillary flowers; peduncles 5-48 mm, sometimes penetrating leaf sinus, thinly pubescent bracteoles 1-2 mm, deltoid; pedicels 3-19 mm, commonly bent at right angles to peduncle, thinly pubescent; sepals unequal, outer (5-) 8-9 × 2-2.5 mm, lanceolate, acuminate, glabrous but often muricate on dorsal surface, inner (8-) 9-11 × 3 mm, oblong, obtuse, mucronate, margins broadly scarious; corolla 6-10 cm long, narrowly funnel-shaped with a long gradually widening paler tube, glabrous, midpetaline bands terminating in a distinct tooth, limb pink 3.5-4 cm diam. Capsules subglobose, glabrous; seeds 4, 6-7 × 4-5 mm, puberulent.

Illustration.

McDonald (1987c: 84); Figures 8Q , 148 .

Distribution.

Low oak woodland and scrub, mostly between 1500 and 2500 m in southern Mexico and Guatemala.

GUATEMALA. Huehuetenango, A. & A.R. Molina 26497 (F).

MEXICO. Est. México & Dist. Fed.: Temascaltepec, G.B. Hinton et al. 4987 (K); ibid., Nanchitla G.B. Hinton et al. 8474 (K); Valle de Bravo, E. Matuda et al. 31768 (MO). Guerrero: Mina, G.B. Hinton 9703 (GBH, K), Manchón, G.B. Hinton 9646 (GBH, K, MO), Montes de Oca, G.B. Hinton 11542 (GBH, K). Michoacán: Charo, Pie de la Mesa, E. Carranza & M.E. Molina 7143 (IEB). Oaxaca: C.G. Pringle 4693 (BM, CM, K, MO); Cerro San Felipe, C. Conzatti 4975 (MO); El Cerezal, Ixtlan, D.H. Lorence et al. 3542 (MO); Cerro Verde, San Luis Tultitlanapa, C.A. Purpus 3535 (BM); San Felipe Tejalapam, M. Cruz 570 (IEB); Juxtlahuaca, A. Garcia Mendoza 5093(MEXU). Puebla: Lomas de San Alfonso, J.L. Contreras 7749 (MEXU); Cerro del Pavilan, C.A. Purpus 3904 (BM, MO). Querétaro: E. Pérez & E. Carranza 3766 (IEB); Jalpan de Serra, E. Carranza et al. 5872 (IEB).

Note.

The muricate outer sepals are rather distinctive. Some Querétaro specimens have large lateral teeth.

Figures

Figure 8. Corollas showing variations in form (side view), size, limb lobing and stamen exsertion. A Ipomoea argentea B I. repanda C I. neei D I. electrina E I. habeliana F I. santillanii G I. nationis H I. rubriflora J I. longistaminea K I. megapotamica L I. megalantha M I. neriifolia N I. syringifolia P I. ramosissima Q I. elongata R I. mucronatoproducta. A from Wood et al. 25639 and photo; B from Whitefoord 5244; C from Skutch 2043; D from Breedlove 27626; E from Bentley 203; F from Bourgeau 3024; G from Saunders 987; H from Wood et al. 27678; J from Pastore et al. 2678; K from Wood et al. 28060; L from Hassler 9114; M from Rezende et al. 1011; N from Stutz 1426 and photo; P from Bang 2246; Q from Purpus 3904; R from Wood & Villarroel 25474. Drawn by Rosemary Wise.

Figure 148. Ipomoea elongata. A habit B habit C outer sepal D middle sepal E inner sepal F corolla opened up to show stamens G ovary and style. Drawn by Rosemary Wise A, B-G from Hinton 8474; B from Purpus 3904.