Ipomoea brasiliana var. subincana (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

108b. Ipomoea brasiliana var. subincana (Choisy) J.R.I. Wood & Scotland, comb. & stat. nov

urn:lsid:ipni.org:names:

Rivea subincana Choisy in A.P. de Candolle , Prodr. 9: 325. 1845. (Choisy 1845: 325). Type. BRAZIL. Prinz Neuwied s.n. (lectotype BR000005844524, designated by Delgado Junior et al. 2017).

Ipomoea subincana (Choisy) Meisn. in Martius et al. , Fl. Brasil. 7: 259. 1869. (Meisner 1869: 259).

Diagnosis. Distinguished by the tomentose pedicels, sepals and exterior of the corolla.

Distribution of species. A common and characteristic species of the caatinga in NE Brazil.

BRAZIL. Alagoas: Piranhas, R. Simão-Bianchini 1739 (ASE). Bahia: L.P. de Queiroz et al. 15963 (HUEFS, OXF)- var. subincana ; Remanso, T. Ribeiro et al. 59 (ALCB, K); ibid., E. Ule 7195 (K); Serra de Açuruá, R.M. Harley et al. 18949 (K); ibid., R.M. Harley et al. 18928; Tucano, de Carvalho et al. 3936 (CEPEC, K); Senhor de Bonfim-Juazeiro, R. Harley et al. 16317 (K, MO); Mun. Uibaí, Serra Azul, R. Atkinson et al. 2484 (ALCB, K). Mun. Rio de Contas, Caminho para Lagoa Nova, R. Harley et al. 5130 (ALCB, K)- var. subincana ; Mun. Abaíra, Engenho dos Vieitas, R. Harley et al. 51550, (HUEFS, CEPEC, K)- var. subincana ; Olha D’Agua, E. Pereira & C. Pabst 9787 (F, HB)- var. subincana ; Serra Geral de Caitité, R.M. Harley 21156 (K)- var. subincana . Ceará: Mun. Aiuaba, J.R. Lemos 83 (K); Paçujá, E.B. Sousa 2419 (UFRN); Perdicão, A. Löfgren 141 (S)- var. subincana ; Mun. Quixeré, M.A. Figueiredo et al. 632 (IPA, K)- var. subincana . Dist. Fed.: Brasilia, E.P. Heringer 14763 (NY). Maranhão: 35 km N of Carolina, E.L. Taylor 1285 (ARIZ, NY). Pernambuco: Ibimirim, M.J.N. Rodal & Tamashiro 628 (UFRP, K); ibid., Tschá & Sales 156 (K); Chapada do Araripe, R.M. Harley et al. 54149 (K); Mun. Buíque, M.J.N. Rodal & A.P.S. Gomes 533 (K); ibid., K. Andrade et al. 348 (K, PEUFR)- var. subincana . Paraíba: Mun. Campina Grande, M.F. Agra 1158 (K). Piauí: Pearson 64 (K); Mun. Picos, G. Eiten & L.T. Eiten 10842 (K, NY); Jurena, G. Sousa 660 (HUEFS)- var. subincana ; B.M.T. Walter 6649 (CEN, RB)- var. subincana ; G. Martinelli 18061 (RB)- var. subincana . Rio Grande do Norte: Natal, L.A. Cestaro 97-0020 (UFRN). Sergipe: Poço Verde, G.G. Conceição 45 (AS).

Note.

Ipomoea brasiliana is usually treated as distinct from I. subincana on the basis of its glabrous sepals. Both taxa occupy the same habitat and geographical range and forms intermediate in indumentum, such as Oliveira 723 (HUEFS, K) from Bahia, are sometimes found. Since indumentum alone is unsatisfactory as a character to distinguish species and there is no marked geographical patterning in the variation or molecular evidence to separate these species ( Muñoz-Rodríguez et al. 2019), we treat these as a single species under the oldest name Ipomoea brasiliana .