Ipomoea syringifolia Meisn. in Martius et al.

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

371. Ipomoea syringifolia Meisn. in Martius et al. , Fl. Brasil. 7: 270. 1869. (Meisner 1869: 270)

Type.

BRAZIL. Minas Gerais, Caldas, A.F. Regnell III 199 bis (S12-2168, lectotype designated here; isolectotype S).

Description.

Perennial, liana-like climber reaching many metres, stems glabrous, woody. Leaves petiolate, 3.5-9 × 1.5-4 cm, ovate, shortly acuminate, subtruncate to shallowly cordate, glabrous, abaxially glaucous; petioles 1-4 cm, slender. Inflorescence of shortly pedunculate axillary cymes, often laxly racemose in form and pendulous; peduncles 1-4 cm, very slender; bracteoles caducous, not seen; pedicels 1.5-2.5 cm, often exceeding peduncles; sepals unequal, glabrous, scarious-margined, outer sepals 6-9 × 4 mm, elliptic, obtuse, inner 9-10 × 4-5 mm, broadly elliptic, rounded; corolla 4-5 cm long, lemon-yellow, glabrous, abruptly widened above base so appearing inflated, limb c. 3 cm diam., shallowly lobed. Capsules ovoid, 12-13 × 7-8 mm, glabrous; seeds 5 × 3 mm, pilose with reddish hairs 6-8 mm long.

Illustration.

O’Donell (1959b: 248); Figures 6D , 8N , 180 .

Distribution.

Atlantic forest and Paraná forest relics; southern Brazil and neighbouring parts of Paraguay and Argentina.

ARGENTINA. Misiones: Dept. Eldorado, S.G. Tressens et al. 5570 (CTES, K); Dept. San Pedro, H. Keller & Franco 9717 (CTES, MO).

PARAGUAY. Alto Paraná: Stutz de Ortega 1426 (G).

BRAZIL. Espirito Santo: Anchieta, A. Stival-Santos 555 (RB). Minas Gerais: A. Glaziou 18382 (K); Viçosa Agric. College, Y. Mexia 4430 (BM, K, MO, S); Caldas, C.W. Mosén 4494 (S). Paraná: Mun. Cel. Vivida, G. Hatschbach 26375 (CTES, MBM, K, S); Rio Branco do Sul, J.M. Silva & G.L. Esteves 1304 (MBM); Therezina, P. Dusen 11146 (GH, NY, S); Faz. Reserva, J.C. Lindeman & J.H. de Haas 4684 (K). Rio de Janeiro: Petropolis, C. Goes & Constantino 3 (RB); Organ Mts, J. Miers s.n. (BM); A. Glaziou 8819 (K). Santa Catarina: F. Plaumann 433 (RB). São Paulo: Heiner 432 (S); J. Weir 506 (K); Martius s.n. (M).

Typification.

None of the original syntypes in LE, K, M and S are very satisfactory, either lacking corollas or with badly eaten leaves. The lectotype selected here is probably the best from a not very high quality selection of specimens.

Note.

This is a distinctive species because of the very lax inflorescence and the pendulous, yellow-green campanulate corollas which are abruptly inflated at the apex of the calyx.

Figures

Figure 6. Sepals of Ipomoea species. A I. argyreia B I. tricolor C I. argentea D I. syringiifolia E I. eriocalyx F I. procurrens G I. tarijensis H I. regnellii. Photographs of A (Mendoza 4899); C (Mendoza 4705) and F (Mendoza 4900) by Moises Mendoza; B (Wood & Soto 27960) and H (Wood & Soto 27951) by Daniel Soto; D by Hector Keller; E (Wood et al. 27809) by Beth Williams; G (Wood 27920) by John Wood.

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 180. Ipomoea syringifolia. A habit B outer sepal C inner sepal D corolla opened out to show stamens E ovary and style F fruiting calyx. Drawn by Rosemary Wise from Stutz de Ortega 1426.