Ipomoea paranaensis Hoehne

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

360. Ipomoea paranaensis Hoehne , Boletim de Agricultura ( São Paulo), 35(1): 475. 1934. (Hoehne 1934: 475)

Ipomoea ramboi O'Donell , Lilloa 30: 48. 1960. ( O’Donell 1960: 48). Type. BRAZIL. Rio Grande do Sul, Nonoai, B. Rambo 28183 (holotype LIL001280).

? Ipomoea kunthiana var. sagittata Meisn. in Martius et al. , Fl. Brasil.7: 253. 1869. (Meisner 1869: 253). Type. Not specified.

Type.

BRAZIL. Paraná, Ponta Grossa, F.C. Hoehne 23230 (holotype SP000577).

Description.

Trailing perennial herb, glabrous in all parts; rootstock, thick, fleshy. Leaves petiolate, 3.5-7 × 2-4.5 ovate to suborbicular, rounded, obtuse or retuse, sometimes mucronulate, base cordate with rounded auricles, abaxially veins prominent; petioles 1-2.5(-4) cm. Inflorescence of solitary, axillary flowers; peduncles 0.5-8 cm; bracteoles 2-4 mm, lanceolate-filiform, apiculate; pedicels 0.5-3 cm, thickened upwards, sometimes rugose; sepals unequal, outer sepals 10-15 × 5-6 mm, broadly or narrowly ovate or elliptic, acuminate, inner sepals similar but larger, 15-28 × 7-8 mm; corolla 6-9 cm long, funnel-shaped, pink, glabrous, limb c. 5-6 cm diam., apparently unlobed; ovary glabrous. Capsules and seeds unknown.

Illustration.

Figure 174 .

Distribution.

A grassland species of southern Brazil and adjacent areas of Argentina. ARGENTINA. Misiones: Dept. General Belgrano, Cementerio Campiñas de América, H. Keller 3733 (CTES).

BRAZIL. Minas Gerais: P. Clausen s.n. (K). Paraná: J.M. Silva et al. 8290 (MBM); Turma, G. Jaussan 1327 (GH, MO, S); Vila Velha-Ponta Grossa, H. Moreira & O. Guimarães 456 (US); Ponta Grossa, Parque Vila Velha, G. Hatschbach 13109 (US); Itaperuçú, P. Dusen 7157 (S, GH, NY); Serrinha P. Dusen 7306 (K, MO, P, S); Piraquara, G. Tessmann (MBM265879). Rio Grande do Sul: type of Ipomoea ramboi . Santa Catarina: Chapecó, L.B. Smith & R.M. Klein 9341 (US); Joaçaba, campos of Rio Iraní, L.B. Smith & R.M. Klein 9838 (US); Mafra, Tingui-Mafra, L.B. Smith & R.M. Klein 10632 (K, US); Abelardo, L.B. Smith & R.M. Klein 13302 (US).

Note.

This species is most likely to be confused with Ipomoea maurandioides but differs in the much longer sepals and the distinctive broadly ovate, often obtuse leaves with rounded auricles.

Figures

Figure 174. Ipomoea paranaensis. A habit B twining habit C outer sepal D inner sepal E corolla opened out to show stamens F ovary and style. Drawn by Rosemary Wise A from Dusen 7306; B from Dusen 1327 a; C-F from Moreira & Guimaraes 456.