82. Ipomoea marcellia Meisn. in Martius et al., Fl. Brasil. 7: 257. 1869. (Meisner 1869: 257)

Marcellia villosa Mart. ex Choisy, Mém . Soc. Phys. Genève 10: 443. 1844. (Choisy: 1844: 443), non Ipomoea villosa Ruiz & Pav. (1799) . Type. BRAZIL. Piauí, inter Capoculo et Serrinha, C.F. Martius 2437 (lectotype M0184915, designated by Delgado Junior et al. [2017]).

? Calystegia discolor Dammer, Bot. Jahrb. Syst. 23 (5), Beibl. 57: 42. 1897. (Dammer 1897: 42). Type. BRAZIL. Minas Gerais, Ayucuroa, A.F.M. Glaziou 11260 (holotype B† (photo F), isotypes K000612831, C10009678).

Type.

Based on Marcellia villosa Mart. ex Choisy

Description.

Usually trailing liana; stems stout, woody, pubescent to tomentose. Leaves petiolate, 9-17 × 5.5-14 cm, broadly ovate, acute to broadly mucronate, base shallowly cordate to truncate, often with a square sinus, margins often undulate, adaxially tomentellous, abaxially white-tomentose; petioles 9-10 cm. Inflorescence woody, long-pedunculate, formed of compound cymes, usually subcapitate; peduncle 20-42 cm, stout, often woody, white-felted to tomentellous; secondary, tertiary, quaternary peduncles often present, 1.5-4 cm diminishing in length and thickness upwards; bracteoles 10-26 × 7-11 mm, oblong-oblanceolate, acute to obtuse, somewhat boat-shaped and partially enclosing calyx, tardily caducous; pedicels 0-6 mm, tomentellous; sepals slightly unequal 13-15 × 8-10 mm, tomentellous, outer elliptic, obtuse, inner obovate-elliptic, pubescent but less so at scarious margins; corolla 4-5 cm long, white to pale lilac, pilose, funnel-shaped; stamens shortly exserted. Capsules 10-12 mm, ellipsoid, glabrous; seeds 6 mm, dark brown, long-pilose.

Distribution.

Endemic to Brazil and almost restricted to caatinga in the north east.

BRAZIL. Alagoas: Agua Branca, K. Costa & Magalhães 561 (SP). Bahia: Jeremoabo, L.P. de Queiroz et al. 4651 (HUEFS, RB); Santa Maria da Vítoria, L.P. de Queiroz et al. 6114 (HUEFS, OXF). Ceará: Estrada de Quichará, A.P. Duarte 1487 (RB); Chapada do Araripe, A. Castellanos & L. Duarte 536 (MO). Paraíba: Mun. Campina Grande, M.F. Agra 1271 (K, MO); Costa & de Brito 145 (JPB). Pernambuco: Mun. Caruaru, Oliveira & Miranda 15 (PEUFR, SP); Alagoinha, D. Andrade-Lima 92 (ASE, SP, SPF). Rio Grande do Norte: Caiçara do Rio do Vento, R.L. Soares Neto 60 (UFRN). Sergipe: D.M. Coelho 435 (RB).

Notes.

Pereira Neto et al. 234 (RB), from Mun. Patrocinio in Minas Gerais, is atypically densely tomentose and distant from the main population and may represent a distinct species.

Calystegia discolor is included in this synonomy with some doubt. The extant isotypes are of poor quality and do not show the distinct inflorescence of Ipomoea marcellia . The type was collected in Minas Gerais and may correspond to the form represented by Pereira Neto et al. 234.