Ipomoea padillae 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

2. Ipomoea padillae O'Donell , Lilloa 29: 207. 1959. ( O’Donell 1959b: 207)

Type.

ARGENTINA. Misiones, Dept. Candelaria, Gramajo, G.J. Schwarz 5552 (lectotype LIL001267, designated here; isolectotypes LIL, P, S, SI).

Description.

Prostrate perennial herb; stems trailing, several metres long, pilose, glabrescent. Leaves petiolate, 3-17 × 3-20 cm, 3-7-palmatilobed, the segments elliptic to obovate, narrowed towards the base, apex obtuse and mucronate, base shallowly cordate, both surfaces thinly pubescent, the lower sometimes sericeous; petioles 1-11 cm. Inflorescence of 1-8-flowered, axillary, pedunculate often compounded cymes; peduncles 2-18 cm long; bracteoles 3-5 mm long, lanceolate, caducous; secondary peduncles 1.5-5 mm; pedicels 9-30 mm long; sepals 7.5-10 × 4-6 mm, subequal, ovate, acute and mucronate, sericeous, the inner with glabrous, scarious margins; corolla 5.5-8 cm long, pink, funnel-shaped, sericeous, limb c. 4 cm diam. Capsules subglobose, 7-8 mm wide, glabrous; seeds not seen.

Illustration.

O’Donell (1959b: 210).

Distribution.

An uncommon plant of degraded cerrado in NE Argentina (Misiones) and neighbouring Rio Grande do Sul in Brazil.

ARGENTINA. Misiones: Leandro, A. Krapovikas et al. 15023 (CTES); Candelaria, Posadas-Bonpland, W.A. Archer 4611 (US); Ruta Nacional 12.2 km del peaje, M.E. Rodríguez & A. Gachez (CTES, FCQ); Apóstoles, H. Keller & Franco 4907 (CTES); Concepción, H. Keller & Franco 5732 (CTES).

BRAZIL. Rio Grande do Sul: Roque Gonzales, Rincão Vermelho, P.P.A. Ferreira & J. Durigon 590 (S); São Borja caminho para Garruchos, P.P.A. Ferreira & J. Durigon 582 (CTES).

Notes.

The palmatilobed pubescent leaves and sericeous exterior of the corolla help to identify this species.

S. Heinonen et al. 117 (CTES) collected in Corrientes, Dept. Ituzaingo at Puerto Valle may represent an undescribed related species. It has trifurcate, thinly appressed pilose leaves divided to near the strongly truncate base. The leaf lobes are oblong, 3-5.5 × 0.5-1.2 cm, the flowers are solitary, borne on a 3-4 cm long, pubescent peduncle with caducous bracteoles and 5-7 mm long pedicels. The corolla is pubescent and the sepals narrowly ovate, 7-8 × 3 mm, subacute and pubescent. The leaf base is very different from that of Ipomoea padillae and other species with trifurcate leaves, such as I. delphinioides .