Ipomoea uruguayensis 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

22. Ipomoea uruguayensis Meisn. in Martius et al. , Fl. Brasil. 7: 272. 1869. (Meisner 1869: 272)

Ipomoea megapotamica var. pauciflora Meisn. in Martius et al. , Fl. Brasil. 7: 259. (Meisner 1869: 259). Type. SOUTHERN BRAZIL (without exact location). F. Sello(w) (possible syntypes BM001125482, F, photo of F. Sello 1776 (B†).

Ipomoea lurida Hassl. , nom. nud., Addenda ad Plantas Hasslerianas 18. 1917. (Hassler 1917: 18).

Type.

URUGUAY or SOUTHERN BRAZIL. J. Tweedie s.n. (lectotype K000899637, designated here).

Description.

Trailing perennial (but appears to be able to climb fide Rambo collection labels); stems at least 1 m long, shortly crisped-pubescent. Leaves petiolate, 5-13 × 2.5-9 cm, ovate or ovate-elliptic, rounded, truncate or broadly cuneate, apex subacute and mucronate, adaxially pubescent, abaxially paler, more densely pubescent; petioles 1-4.5 cm, pubescent. Inflorescence od long-peduculate (1-)3(-4)-flowered axillary cymes, very occasionally branched and compound; peduncles 5.5-16 cm long, pubescent; bracteoles linear-lanceolate, 6-8 mm long; pedicels 6-30 mm, pubescent; sepals subequal, 10-12 × 5-7 mm, elliptic, acute and shortly mucronate, densely pubescent, inner sepals white tomentose with scarious subglabrous margins; corolla c. 5 cm long, pink, funnel-shaped, pubescent, limb c. 3.5 cm diam., apparently lobed. Capsules and seeds not seen.

Distribution.

Apparently restricted to southern Brazil and adjacent eastern Paraguay.

PARAGUAY. Alto Paraná: K. Fiebrig 6346 (GH, US); cerca de Hernandarias, junto al arroyo Pirapitá, Fernández Casas et al. 7326 (NY); Reserva Biológica Tatí Yupí, Itaipú Binacional, G. Caballero Marmori 1421 (CTES).

BRAZIL. Rio Grande do Sul: C. Gaudichaud, Herb. Imp. 668 (P), 672 (P); O. Bueno 10668 (CTES, F); Fox 62 (K); Morro da Gloria, B. Rambo 70 (LIL); Morro de Polizia, near Puerto Alegre, B. Rambo 39193 (LIL), Fazenda do Arroio, near Osorio, B. Rambo 45240 (P); Mun. Lagoa Vermelha, A. Krapovickas & C. Cristóbal 41934 (CTES); Porto Alegre, P. Ferreira 119 (CTES).

Typification.

In choosing a lectotype for this species, we have selected the only extant Tweedie collection. No suitable material was found at B, BR or M.

Note.

This species is characterised by the inflorescence that consists of long-pedunculate, usually 3-flowered cymes and by the large ovate leaves, pubescent to subtomentose on both surfaces.