144. Ipomoea mirabilis Ferreira & Sim. -Bianch., Phytotaxa 1355 (1): 30. 2013. (Ferreira et al. 2013: 30)

Type.

BRAZIL. Rio Grande do Sul, Tio Hugo, P.P.A. Ferreira & J. Durigon 702 (holotype ICN, isotype S).

Description.

Twining perennial; stems woody, tomentellous, glabrescent; latex white. Leaves petiolate, 8-15 × 6-10 cm, ovate, cordate with rounded auricles, acute to acuminate and mucronate, tomentose on both surfaces; petioles 5-11 cm. Inflorescence of lax, axillary cymes; peduncles 1-22 cm, tomentose or glabrescent; bracteoles linear or lanceolate, deciduous; secondary and tertiary peduncles 5.5 cm; pedicels 4-22 mm; sepals unequal, glabrous with scarious margins, outermost 6-9 mm, ovate to broadly elliptic, emarginate, inner 9-12 mm, suborbicular to obovate, obtuse, minutely mucronate; corolla c. 6 cm long, funnel-shaped, pink, glabrous, throat dark pink, limb 3-3.5 cm diam. Capsules 10-12 × 9-10 mm, ovoid, shortly rostrate, glabrous; seeds 6-8 mm long, glabrous apart from the long white marginal hairs.

Illustration.

Ferreira et al. (2013: 31).

Distribution.

Recorded from southern Brazil and neighbouring Argentina growing in deciduous forest margins and scrub.

ARGENTINA. Misiones: Iguazú, Wanda, H.A. Keller & H.F. Romero 13252 (CTES, OXF); Montecarlo, Col. Guatambo, H.A. Keller 4038 (CTES).

BRAZIL. Rio Grande do Sul: P.P.A. Ferreira & J. Durigon 705 (ICN, INPA); São Francisco de Paula, A. Seynam 10020 (MBM). Santa Catarina: Descanso. R.M. Klein 5119 (HBR) fide Ferreira et al. (2013: 32).

Notes. This species is distinguished by its small outer sepal and very lax, branched inflorescence and glabrous corolla.

The placement of this species is uncertain.