Ipomoea delphinioides Choisy

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

21. Ipomoea delphinioides Choisy , Mém. Soc. Phys. Genève 8 (1): 53 [131]. 1838. (Choisy 1838: 53 [131])

Ipomoea polymorpha var. delphinioides (Choisy) Meisn. in Martius et al. , Fl. Brasil. 7: 252. 1869. (Meisner 1869: 252).

Convolvulus campestris Vell. , Fl. Flumin.74. 1825 [pub. 1829]. (Vellozo 1829: 74), non Ipomoea campestris Meisn. (1869) . Type. BRAZIL. [ São Paulo], Cunha (lectotype, original parchment plate of Flora Fluminensis in the manuscript section of the Biblioteca Nacional, Rio de Janeiro [cat. no.: mss1198651-066], designated here; later published in Vellozo, Fl. Flum. Icon. 2: t. 66. 1827 [pub. 1831]).

Ipomoea trifurcata Choisy , Mém. Soc. Phys. Genève 8 (1): 53 [131]. 1838. (Choisy 1838: 53 [131]). Type. BRAZIL. São Paulo, Mugi das Cruzas, N. Lund (isotypes G, possible isotype P03390576).

Ipomoea polymorpha var. heteromorpha Meisn. in Martius et al. , Fl. Brasil. 7: 252. 1869. (Meisner 1869: 252). Type. Based on Ipomoea trifurcata Choisy

Ipomoea aspersa Mart. ex Choisy in A.P. de Candolle , Prodr. 9: 368. 1845. (Choisy 1845: 368). Type. BRAZIL. "ex Cam Raben n. 275" (lectotype BR00005307272, designated here).

Ipomoea polymorpha var. calvescens Meisn. in Martius et al. , Fl. Brasil. 7: 252. 1869. (Meisner 1869: 252), nom. illeg., superfl. Type. BRAZIL. Based partly on Ipomoea aspersa and partly on Martius Obs. 571 (M).

Type.

BRAZIL. São Paulo, Taubaté, N. Lund 771 (holotype G00135575).

Description.

Perennial with prostrate to ascending, appressed pubescent stems, rootstock tuberous with subcylindrical tubers. Leaves shortly petiolate, 2.5-6.5 × 0.8-3.5 cm, oblong-elliptic, obtuse to rounded, mucronulate, base cuneate, usually 3-lobed to half way (occasionally entire, rarely 5-lobed more deeply), finely pubescent on both surfaces; petioles 0.1-1.2 cm. Inflorescence of pedunculate axillary cymes, often reduced to solitary flowers; peduncles 0.3-6 (-13) cm, pubescent; bracteoles filiform, 4 mm, caducous; pedicels 5-10 mm, pubescent; sepals 7-12 mm, subequal, narrowly ovate, subacute to obtuse, pubescent, the inner with broad, scarious, glabrous margins; corolla 5-6 cm long, white or pale pink, funnel-shaped, sericeous, limb c. 3-4 cm diam. Capsules c. 11 × 7 mm, ovoid, glabrous; seeds not seen.

Distribution.

Endemic to Brazil, where it is recorded principally from cerrados in Paraná, São Paulo and Minas Gerais states but is perhaps most common in São Paulo and Paraná.

BRAZIL. sine data, W.J. Burchell A285 (K); sine data, J.B. Pohl (OXF). Minas Gerais: A.F. Regnell Ser. 3, 203 (K); C.W. Mosén 4286 (S); M.M. Arbo et al. 3936 (CTES, SPF); P. Clausen s.n. (K); Santa Bárbara, L. Duarte 969 (HB, K). Paraná: Laranjeiras do Sul, G. Hatschbach 15546 (MB, US); Sengés, J.R.V. Iganci et al. 751 (ICN, S); Mun. Tibagí, Fda. Monte Alegre, Harmonia, G. Hatschbach 2984 (US); Parque Vila Velha, G. Hatschbach 13107 (F); Mun. Arapoti, G. Hatschbach 8370 (US); ibid., Rio das Perdizes, G. Hatschbach 18838 (CTES, F); Mun. Castro, Carambei, Rio São João, L. B. Smith et al. 14475 (US); ibid., R. Reitz & R.M. Klein 17887 (F, P, US). Rio Grande do Sul: Sengés, J.R.V. Iganci et al. 751 (S). São Paulo: I.S. Gottesberger 930 (FTG); L. Riedel 1672 (LE, K); Botucatu, G. Edwall 3386 (SP); Mun. Itarare, V. Souza 4482 (SPF, CTES); Jabaquara, M. Kuhlmann 10.440. (K); Congonhas, W. Hoehne 13706 (F, K); Cachambu, J. Weir 338 (BM, K).

Note.

This species was aptly named Ipomoea polymorpha by Meisner because of the very varied leaf form. It is usually with 3-lobed leaves but in specimens with entire leaves, the leaves are oblong. Hatschbach 8370 is abnormal in being nearly glabrous. The obtuse sepals are a useful distinguishing feature. Entire-leaved forms ( I. aspersa ) may resemble I. uruguayensis but can be recognised by the pubescent leaves which are not grey-tomentose beneath (or only very slightly so), and the inner sepals which have broad, glabrous, scarious margins. They are more common in Paraná State.