Ipomoea saopaulista O'Donell

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

86. Ipomoea saopaulista O'Donell , Lilloa 26: 392. 1953. ( O’Donell 1953a: 392)

Ipomoea floribunda Moric. var. martii Meisn. in Martius et al. , Fl. Brasil. 7: 262. 1869. (Meisner 1869: 262). Type. BRAZIL. A.F. Regnell [1]11: 198, lectotype BR000005748655 designated here).

Ipomoea batatoides var. tomentosa Glaz. , Bull. Soc. Bot. France 57, mém. 3e: 484. 1910. (Glaziou 1910: 484). Type. BRAZIL. Serra de Pragaos a Theresopolis, Rio de Janeiro, A.F.M. Glaziou 4143 (B, C, K, P), nom. nud.

Ipomoea paulistana O'Donell , Dusenia 3: 278. 1950. ( O’Donell 1950c: 278), non Ipomoea paulistana (Silva Manso) Stellfeld (1945) .

Type.

Based on Ipomoea floribunda Moric. var. martii Meisn.

Description.

Variable twining perennial or liana to 6 m, stems (and leaves) glabrous to tomentellous. Leaves petiolate, 4-12 × 4-12 cm, ovate, shortly acuminate, cordate, with rounded auricles, adaxially glabrous, abaxially glabrous, pubescent or tomentellous; petioles 2.5-5.5 cm. Inflorescence typically many-flowered, subcorymbose in form or a raceme of umbels; peduncles 2-9(-20) cm; bracteoles caducous, scale-like; secondary peduncles 3-5 cm; tertiary peduncles 1-1.5 cm; pedicels 5-20 mm; sepals unequal, outer 7-8 × 3-4 mm, ovate, obtuse, scarious-margined, glabrous, inner 8-10 × 4-5 mm, oblong-elliptic, rounded to retuse, margins broad, scarious; corolla (3-)3.5-4.5 cm long, white, funnel-shaped, glabrous, limb 2.5 cm diam. Capsules 9-10 × 8-12 mm, subglobose, glabrous; seeds 6 × 2-3 mm, pilose with long cilia c. 8 mm in length.

Illustration.

Figure 54 .

Distribution.

Common in scrub and woodland and on woodland borders in the São Paulo area extending north to Bahia and south to NE Argentina and Rio Grande do Sul. Records from Mato Grosso and Pará (Flora do Brasil 2020 under construction require confirmation).

ARGENTINA. Corrientes: Ituzaingo, A. Schinini et al. 11144 (CTES). Misiones: Belgrano, H. Keller & Franco 9733 (CTES); San Pedro, Rodríguez 1165 (CTES).

BRAZIL. Bahia: Estrada de Catuaba para Bonito, L.P. de Queiroz et al. 15967 (CTES, OXF). Dist. Fed.: Lago Paranoá, Nascimiento et al. 148 (K); Bacia do Rio São Bartolomeu, E.P. Heringer et al. 6693 (IBGE, K, MO); Côrrego Landim, H.S. Irwin et al. 14028 (NY). Espirito Santo: Santa Teresa, Wilson Boone 1116 (MO); A.P. Duarte 8834 (RB); Castelo, R. Goldenberg 1074 (RB). Goiás: Corumbá de Goiás, E.P. Heringer & A.E.H. Salles 17024 (IBGE, MO); Serra Geral do Paraná, W.R. Anderson et al. 7700 (NY, MO); H.S. Irwin et al. 31787 (NY). Minas Gerais: P. Clausen s.n. (K); C.W. Mosén 4521 (S); A. Arbo et al. 5288 (CTES, SPF); Viçosa Agricultural College, Y. Mexia 4397 (BM, K, MO, NY, S). Paraná: Adrianópolis, G. Hatschbach 38533 (CTES, NY); Cel. Vivida, G. Hatschbach 26373 (CTES, K, MBM, NY, S); O.S. Ribas 6203 (MBM). Rio de Janeiro: D. Sucre 2703 (RB); Petrópolis, G. Martinelli 801 (RB). Rio Grande do Sul: P.P.A. Ferreira 61 (ICN) fide Ferreira and Miotto (2009: 449). Santa Catarina: P. Dusen 11892 (NY, S). São Paulo: C.W. Mosén 1499 (S); Mairipora, Beira de Fernão Dias, J.R. Pirani et al. 17559 (SPF, K).

Note.

In much of its range this species is easily recognised by its creamy-white flowers arranged in subumbellate cymes. However it can only be distinguished from Ipomoea reticulata by the larger sepals and corolla and some specimens can be difficult to assign, particularly from the Brasilia area. There is a case, therefore, for treating these two species as subspecies but we are reluctant to make this decision. Although I. reticulata is always glabrous or minutely scabridulous-puberulent, the leaves of I. saopaulista are commonly densely pubescent or even tomentose, a state never seen in I. reticulata and mere size is not, therefore, the only distinguishing feature between the two species.

Figures

Figure 54. Ipomoea saopaulista A habit B outer sepal C inner sepal D corolla opened out to show stamens E ovary and style F calyx in fruit. Drawn by Rosemary Wise from de Queiroz et al. 15967.