Ipomoea rosea Choisy in A.P. de Candolle

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

90. Ipomoea rosea Choisy in A.P. de Candolle , Prodr. 9: 384. 1845. (Choisy 1845: 384)

Type.

BRAZIL. Piauí, Martius (holotype M0184974).

Description.

Glabrous twining herb to 3 m; stems relatively slender. Leaves petiolate, divided into 3 leaflets (reduced 4th or 5th leaflets sometimes present), leaflets 0.1-5.2 × 0.05-1.8 cm, unequal, the terminal usually larger than the laterals, lanceolate to oblong-elliptic, obtuse, basally cuneate; petioles 0.4-3.5 cm. Inflorescence of lax axillary pedunculate cymes; peduncles 1.5-5 cm; bracteoles 1 mm, linear, caducous; secondary peduncles 1.5-2cm; pedicels 2-5 mm; sepals 6-7 × 2-3 mm, unequal, outer oblong-elliptic to obovate, acute, scarious-margined, with subapical often tooth-like acute dorsal protuberance, inner broadly to narrowly oblong, obtuse, scarious with a blunt protuberance; corolla 5-6 cm long, pink, narrowly funnel-shaped, glabrous, limb 3-4 cm diam. Capsules globose, 5-6 mm diam. glabrous; seeds 4 × 3 mm, the angles shortly pilose.

Illustration.

Figures 4B , 58 .

Distribution.

A characteristic species of caatinga, endemic to NE Brazil.

BRAZIL. Alagoas: fide Flora do Brasil (2020). Bahia: Serra do Açuruá, NE of Gentio do Ouro, R.M. Harley et al. 18947 (K, NY); Serra Geral de Caitité, R.M. Harley et al. 21217 (K, NY); Mun. Abaíra, J.R. Pirani et al. 51360 (K, MO); Morro de Chapéu, L. Cardoso 1639 (RB); Rio de Contas, R.M. Harley et al. 54830 (K). Ceará: Mun. Quixeramobim, J. Collares & L. Dutra 181 (K); Mun. Aiuaba, M.A. Figueiredo et al. 588 (K, EAC); A. Löfgren 259 (S). Paraíba: Mun. Campina Grande, M.F. Agra 1132 (K); regiones secas, J. Coêlho de Moraes 2105 (K, P, S, W). Pernambuco: Mun. Faz. Nova, W.M. Andrade & L.S. Figueiredo 149 (K, PEUFR); P.N. do Catimbaú, G.C. Delgado Junior (RB); Ibimirim, A. Gomes 28 (UFRN); B. Pickel 3572 (S). Piauí: G. Gardner 2245 (K, BM, OXF). Rio Grande do Norte: Ceará-Mirim, J.G. Jardim 6061 (UFRN); Natal, V.R.R. Sena 198 (RB). Sergipe: Poço Redondo, R. Simão-Bianchini 1746 (ASE).

Note.

A slender fragile plant easily fracturing when dry. The leaves are usually with three oblong-elliptic leaflets, much broader than in Ipomoea graniticola . The sepals are quite variable and the tooth-like appendage is often reduced to little more than a swelling.

Figures

Figure 4. Sepals of Ipomoea species. A I. racemosa B I. rosea C I. alba D I. hirsutissima E I. barbatisepala F I. ampullacea G I. gigantea H I. longeramosa. Photographs of A (R. A. & E. S. Howard 8863) E (Gonzalez Ortega 874) and F (Lott & Wendt 2192) by John Wood; B (Harley et al. 54830); C (Fendler 589) and H (Pickersgill et al. RU 72 - 400) by John Baker; D (Mendoza 4365) and G (Mendoza 4645) by Moises Mendoza.

Figure 58. Ipomoea rosea. A habit with buds B habit with corolla C outer sepal, abaxial view (left), lateral view (right) D inner sepal E corolla opened out to show stamens F ovary and style G calyx and capsule H seed J seed, lateral view. Drawn by Rosemary Wise A from Figueiredo et al. 588; B from Pirani et al. 51360; C-F from Harley et al. 18947; G-J from Harley et al. 21217.