Ipomoea sericosepala

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

395. Ipomoea sericosepala J.R.I. Wood & Scotland, Kew Bull. 70 (31): 21. 2015. (Wood et al. 2015: 21)

Rivea cordata Choisy in A.P. de Candolle , Prodr. 9: 326. 1845. (Choisy 1845: 326), non Ipomoea cordata L. B. Sm. & B.G. Schub. (1939) . Type. BRAZIL. Minas Gerais, San Francisco prope Salgado, Martius s.n. (lectotype M0184947, designated by Austin and Staples 1991: 272).

Turbina cordata (Choisy) Austin & Staples, J. Arnold Arbor. 64: 488. 1983. (Austin and Staples 1983: 64).

Ipomoea martii Meisn. in Martius et al. , Fl. Brasil. 7: 258. 1869. (Meisner 1869: 258), nom. illeg. Type. as for Rivea cordata .

Type.

Based on Rivea cordata Choisy

Description.

Liana climbing high over shrubs to 7 m, stems white-tomentose, especially when young, latex white. Leaves petiolate, 4-8 × 8-9 cm, broadly ovate, apex acute and mucronate or (less commonly) obtuse or retuse, base truncate to shallowly cordate, adaxially glabrous, glabrescent or shortly pubescent, abaxially grey-sericeous with long silky hairs; petioles 1-6 cm, tomentose. Inflorescence of pedunculate axillary cymes, these often leafy and appearing to be side branches; peduncles 3-13 cm; bracts resembling small leaves; bracteoles c. 5 mm long, linear-lanceolate, abaxially sericeous, caducous; secondary peduncles up to 9 cm long; pedicels 6-32 mm; sepals unequal, outer 8-10 × 3-4 mm, oblong, obtuse and sometimes mucronate, sericeous, inner 11-14 × 6 mm, elliptic-obovate, rounded, mucronate, sericeous, the margins broad, scarious, glabrous; corolla 5-7 cm long, funnel-shaped, pink, sericeous with long silky hairs, limb c. 5 cm diam., shallowly lobed. Capsules ovoid, 14-18 × 7-10 mm, glabrous; seeds 1-2, narrowly ellipsoid, 8-10 mm, tomentellous.

Illustration.

Figures 7E , 9G .

Distribution.

Restricted to scattered locations in Brazil and Bolivia. In Brazil it is far more common than Ipomoea abutiloides and is especially so in the state of Bahia, where it is typical of caatinga vegetation. In Bolivia it is much less common than I. abutiloides and with the single exception of a population on an inselberg near San José Campamento in Velasco, it is restricted to the western Chaco and Serrano Chaqueño scrub and dry forest along the Río Grande Valley entering the Andes.

BRAZIL. Bahia: Correntina, R.M. Harley et al. 21811 (CEPEC, K); Curaça, G.C.P. Pinto & S.B. da Silva 13413 (K); Maracás, A. de Carvalho et al. (CEPEC, K); Caetité, M.L. Guedes et al. (ALCB, K). Ceará: Löfgren 260 (S); Est. Biológica da Aiuaba, J.R. Lemos & P. Matías 155 (USP, K); Serra de Maranguape, A. Ducke 2541 (K). Dist. Fed.: B.A.S. Pereira 213 (IBGE, K, MO), E.P. Heringer 1393 (K); H.S. Irwin 13160 (MO, NY). Goiás: Corumbá de Goiás, E.P. Heringer et al. 1228 (MO, NY), 16982 (K, IBGE). Minas Gerais: A. Glaziou 19673 (K, P); Y. Mexia 5568 (K, MO, S); A. Macedo 304 (S), 1781 (BM, MO); L.O Williams & V. Assis 5899 (GH, MO). Mato Grosso: Nova Xavantina, G.F. Arbocz 3704 (ESA). Paraíba: M.F. Agra et al. 4068 (MO). Pernambuco: L.S. Figueirêdo & W.M. Andrade 415 (K, PEUFR); S. Tsugaru et al. B-1430 (MO); A.P. Fontana et al. 9176 (RB). Rio Grande do Norte: J.G. Jardim 6211 (UFRN). São Paulo: W. Hoehne 12742 (SP, K). Sergipe: R. Simao-Bianchini 1756 (ASE).

BOLIVIA. Chuquisaca: Luis Calvo, Muyupampa, J.A. Peñaranda & J.G. Tudela 1116 (MO, OXF); Oropeza, Río Chico valley, J. Gutiérrez 406 (HSB, K); Zudañez, Mojocoya, J.R.I. Wood & H. Huaylla 21549 (K, LPB). Cochabamba: Campero, Valle de Tunas Pampa, J.R.I. Wood & M. Mendoza 21517 (K, LPB). Santa Cruz: Cordillera, Boyuibe, J.R.I. Wood et al. 20107 (HSB, K, LPB, USZ); Vallegrande, Río Grande Valley, J.R.I. Wood et al. 22793 (K, LPB); Velasco, San José de Campamiento, R. Guillén et al. 4272 (ARIZ, NY, USZ). Tarija: Gran Chaco, M. Nee & I. Linneo 54033 (MO, NY, USZ).

Notes.

Ipomoea sericosepala and I. abutiloides are similar in their liana habit, leaves grey-tomentose or sericeous beneath, their oblong-elliptic sepals and their inflorescences which have a tendency to become leafy and racemose or even paniculate towards the branch tips. They are best distinguished by the sepal indumentum, I. sericosepala having sericeous sepals while those of I. abutiloides are glabrous. The two species intergrade in the Abapó area of Bolivia where their ranges overlap.

Records from Peru (Austin and Staples 1991: 273) are mostly errors for the very similar Ipomoea pearceana Kuntze , which differs in little more than the relatively persistent elongate- oblong bracteoles.

Figures

Figure 7. Sepals of Ipomoea species. A I. meyeri B I. ternifolia C I. cryptica D I. heterodoxa E I. sericosepala F I. splendor-sylvae G I. squamisepala H I. trifida. Photographs of A (Anderson 1895) B (Pringle 4439) C (Soto et al. 1331) E (Wood & Soto 27550) F (Wilkin 472) and H (Smith 1570) by John Baker; D (Wallnoefer 9506) by John Wood; G (Mendoza 4902) by Moises Mendoza.

Figure 9. Pollen of Ipomoea species. A I. hieronymi (Wood et al. 28055) B I. wolcottiana (Hughes et al. 1911) C I. bonariensis (Wood et al. 27871) D I. bahiensis (Queiroz 15975) E I. maurandioides (Krapovickas & Cristobal 1573) F I. corymbosa (Jurgensen 612) G I. sericosepala (Wood 28122) H I. tiliifolia (Beddome 5581). Photos by Robert Scotland.