Ipomoea malpighipila 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

7. Ipomoea malpighipila O'Donell , Lilloa 23: 448. 1950. ( O’Donell 1950a: 448)

Type.

ARGENTINA. Misiones, Dept. San Ignacio, Gob. Roca, 22 Nov. 1947, G.J. Schwarz 2338 (holotype LIL001259).

Description.

Erect perennial herb or subshrub from a xylopodium, stems 0.5-1 m long, usually simple, distinctly angled, adpressed pubescent with t-shaped hairs. Leaves shortly petiolate, 3-fid from near base, lobes 7.5-15 × 0.2-1.2 cm, narrowly oblong, shortly mucronate, base attenuate, both surfaces adpressed-pubescent, abaxially prominently veined; petioles 1-1.5 cm. Inflorescence elongate (to 10 cm), terminal, formed of shortly pedunculate cymes from the axils of leaf-like bracts, these absent in the upper part of inflorescence; peduncles 0.4-1.5 cm, adpressed pubescent; bracteoles ovate, caducous; pedicels 3-8 cm, adpressed pubescent; sepals equal, 6-8 × 4-6 mm, elliptic to suborbicular, obtuse and often mucronate, subsericeous; corolla 3.5-5 cm long, pink, funnel-shaped, adpressed pubescent. Capsules 7-10 × 7-8 mm, subglobose, glabrous; seeds 6 × 4 mm, blackish-brown, margins lanate.

Illustration.

O’Donell (1959b: 177).

Distribution.

Almost endemic to the province of Misiones in Argentina where it grows in seasonally flooded grassy pampa. There appear to be no recent records from Paraguay or Brazil.

ARGENTINA. Misiones: San Ignacio, D. Giambaggio s.n. (SI); G.J. Schwarz 5334 (E, LIL, S); M.E. Rodríguez & A. Gochez 1179 (MA); H. Keller et al. 6464 (CTES); J.E. Montes 458 (LIL, S).

PARAGUAY. Itapúa: Encarnación, T. Rojas 29 (SCP).

BRAZIL. Rio Grande do Sul: Agusto s.n. (ICN18804), fide Ferreira and Miotto (2009: 446).

Note.

The T-shaped hairs are difficult to observe but are distinctive. Ipomoea malpighipila is usually easily identified by the terminal inflorescence and obscurely pubescent, trifid leaves with narrowly oblong lobes.