Ipomoea sulina P.P.A.Ferreira & Miotto Kew Bull.

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

94. Ipomoea sulina P.P.A.Ferreira & Miotto Kew Bull. 66(2): 290. 2011. (Ferreira and Miotto 2011: 290)

Type.

BRAZIL. Rio Grande do Sul, Itati, P.P.A. Ferreira 287 (holotype ICN; isotypes K, SP, LIL).

Description.

Perennial twining plant to 4 m, stems woody, grey-tomentose, somewhat glabrescent. Leaves long-petiolate, 7-23 × 6-22 cm, ovate, acute to acuminate, shortly mucronate, cordate, adaxially tomentellous, green, abaxially grey-tomentose; petioles 5-17 cm, tomentellous. Inflorescence of 1-8-flowered axillary cymes; peduncles 3-16 cm, pubescent; bracteoles 1-3 mm, lanceolate, caducous; secondary peduncles up to 4 cm; pedicels 10-30 mm, puberulent; sepals unequal, glabrous, outer 10-13 × 8-9 mm, broadly ovate, obtuse, inner 14-17 × 12 mm, broadly elliptic, rounded or emarginate, margins scarious; corolla 5-8 cm long, funnel-shaped, glabrous, white with purple throat, limb c. 6.5 cm diam. Capsules subglobose, shortly rostrate, glabrous; seeds glabrous with long marginal hairs.

Illustration.

Ferreira and Miotto (2011: 293).

Distribution.

Endemic to southern Brazil in Rio Grande do Sul and Santa Catarina Stares growing on the borders of Araucaria forest.

BRAZIL. Rio Grande do Sul: Taquara, B. Rambo 44809 (LIL, PACA); ibid., B. Rambo 52115 (LIL, PACA, S). Santa Catarina: Itapiranga, B. Rambo s.n. (PACA) fide Ferreira and Miotto (2011).

Notes.

Resembles Ipomoea philomega in the large leaves and in the size and shape of sepals but differs in the hirsute, abaxially grey-tomentose leaves. The strikingly unequal sepals are noteworthy. It was identified as Ipomoea viridis Choisy by O’Donell but does not seem to fit the protologue.

Its placement here is uncertain.