Three new species of Ipomoea L.(Convolvulaceae) from Southern Brazil

KEW BULLETIN VOL. 66: 289–294 (2011)

Three new species of Ipomoea L. (Convolvulaceae) from Southern Brazil Priscila Porto Alegre Ferreira1 & Silvia Teresinha Sfoggia Miotto2

Summary. Ipomoea L. is the most speciose genus of the Convolvulaceae, comprising c. 140 species in Brazil. Three

new species are described and illustrated from Rio Grande do Sul and Santa Catarina states: Ipomoea pampeana P. P. A. Ferreira & Miotto, I. riograndensis P. P. A. Ferreira & Miotto and I. sulina P. P. A. Ferreira & Miotto. Resumo. Ipomoea L. é o gênero com maior riqueza específica pertencente à Convolvulaceae, representado no Brasil por aproximadamente 140 táxons. Foram reconhecidas três novas espécies para os estados do Rio Grande do Sul e de Santa Catarina: Ipomoea pampeana P. P. A. Ferreira & Miotto, I. riograndensis P. P. A. Ferreira & Miotto e I. sulina P. P. A. Ferreira & Miotto. Key Words. Brazil, Convolvulaceae, Ipomoea, new species, Rio Grande do Sul, Santa Catarina.

Introduction Traditional concepts of Ipomoea L. recognise 600 – 700 species, thereby identifying the group as the most speciose in the Convolvulaceae (Austin & Huáman 1996). The genus is represented in Brazil by about 140 species (Simão-Bianchini & Pirani 2005). Ipomoea grows in tropical and subtropical climates around the world and has a high morphological diversity in both vegetative and reproductive characters (Miller et al. 1999). Studies related to the Brazilian species are few, notable examples being Meissner (1869), Austin & Cavalcante (1982) and Simão-Bianchini (1998). Three new species of Ipomoea were recognised during a taxonomic review of the genus in southern Brazil (states of Rio Grande do Sul and Santa Catarina). The new taxa are placed in subgen. Eriospermum (Hallier f.) Verdc. ex Austin (Austin 1975, 1979, 1980; Austin & Huáman 1996), characterised by woody, perennial taxa with a 2-carpellate and 2-locular ovary and seedlings that have woolly trichomes, at least on the sides, or are uniformly tomentose or glabrous. Material and Methods Herbarium material from HAS, ICN, K, LIL, PACA, PEL, SMDB and SP was examined. Field expeditions were carried out for taxa collection and observation. Specimens were deposited in the herbarium of Instituto de Biociências, Universidade Federal do Rio Grande do Sul (ICN), Porto Alegre, Brazil.

Taxonomic Treatament 1. Ipomoea pampeana P. P. A. Ferreira & Miotto sp. nov., affinis Ipomoea malvaeoide Meisn., sed ab ea habito ligneo scandente, foliis tomentosis et palmatisectis, sepalis acutis emucronatis differt. Typus: Brazil, Rio Grande do Sul, Manoel Viana, 29°34'28.7"S, 55° 27'30.4"W, 14 March 2008, Ferreira 279 (holotypus ICN!; isotypi K!, LIL!, SP!). http://www.ipni.org/urn:lsid:ipni.org:names:77112477-1 Perennial woody twiners, latex white; stems 3 m long, grey-tomentose, simple trichomes. Leaves simple, alternate, petiole grey-tomentose, 2 – 5 cm long, apex glandular; leaf-blade palmately lobate, 4 – 10 × 5 – 15 cm, grey-tomentose, segments 5, elliptic, obovate or oblanceolate, 0.7 – 3 cm wide, entire or lobed, apex acute or obtuse, mucronate. Cymes bearing 1 – 12 flowers; bracts and bracteoles lanceolate, grey-tomentose, 0.3 – 0.6 cm long, deciduous; peduncles 2 – 13 cm long, grey-tomentose, pedicels 0.7 – 1 cm long, greytomentose. Sepals unequal, outer three ovate, 1 – 1.2 × 0.4 – 0.5 cm, apex acute, adaxial surface glabrous, abaxial grey-tomentose, margins scarious, base glandular; inner two ovate, 1.1 – 1.3 × 0.6 – 0.7 cm, apex acute, adaxial surface glabrous, abaxial grey-tomentose in the central area, margins scarious; corolla infundibular, 5 – 7 cm long, with a pink limb, 5 – 6 cm in diam., and purple throat, interplicae sericeous. Stamens

Accepted for publication June 2010. 1 Programa de Pós-graduação em Botânica, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, Rio Grande do Sul 91501970, Brazil. e-mail: [email protected] 2 Departamento de Botânica, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, Rio Grande do Sul 91501-970, Brazil.

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unequal, included, 1.7 – 2.7 cm long, the filaments fused to the base of the corolla tube, glandularpubescent at the base. Ovary ovoid, glabrous, 2-locular, apically attenuate; style 2 – 2.3 cm long; stigma biglobose. Capsule subglobose, 4-valved, base of style forming an apiculate apex, seeds 2 – 4, black, 0.7 – 0.8 cm long, tomentose. Fig. 1.

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6.5 cm in diam., and purple throat or totally white, interplicae sericeous. Stamens unequal, included, 1.5 – 2.3 cm long, the filaments fused to the base of the corolla tube, glandular pubescent at the base. Ovary ovoid, glabrous, 2-locular; style 2 – 2.5 cm long; stigma biglobose. Capsule subglobose, 4-valved, base of style forming an apiculate apex; seeds 2 – 4, brown, 0.5 − 0.7 cm long, tomentose. Fig. 2.

DISTRIBUTION. Brazil: Rio Grande do Sul state, Campanha

region. SPECIMENS EXAMINED. BRAZIL. Rio Grande do Sul:

Manoel Viana, 29°34'28.7"S, 55°27'30.4"W, 14 March 2008, Ferreira 279 (holotype ICN; isotypes K, LIL, SP); Manoel Viana, 21 Jan. 2008, Ferreira 143 (ICN). HABITAT. In areas of flat relief; 100 m. The grassland vegetation in this area has a predominance of prostrate, caespitose and shrubby species (Boldrini 1997). CONSERVATION STATUS. IUCN category: Data deficient (DD). ETYMOLOGY. The specific epithet refers to its occurrence in the Pampa. NOTES. Ipomoea pampeana can be recognised as a woody twiner with tomentose, palmately divided leaf-blades and non-mucronate sepals. Ipomoea malvaeoides differs in being a decumbent subshrub with mucronate sepals.

2. Ipomoea riograndensis P. P. A. Ferreira & Miotto sp. nov., affinis Ipomoea megapotamica Choisy, sed ab ea foliis tomentosis in superficie abaxiali, sepalis 1 – 1.1 × 0.6 – 0.8 cm et seminibus tomentosis differt. Typus: Brazil, Rio Grande do Sul, Porto Alegre, 30°03'14.0"S 51°07'52.7"W, 13 Dec. 2007, Ferreira 118 (holotypus ICN!; isotypi K!, LIL!, SP!). http://www.ipni.org/urn:lsid:ipni.org:names:77112478-1 Perennials woody, stems prostrate, with twining apices, latex white; stems 4 m long, grey-sericeous, simple trichomes. Leaves simple, alternate, petiole grey-sericeous, 2 – 5.5 cm long, apex glandular; leaf-blade ovate to suborbicular, 6 – 12 × 4 – 10 cm, adaxial surface grey-sericeous, abaxial grey-tomentose, entire, base truncate to subcordate, apex obtuse to emarginate, mucronate. Cymes bearing 1 – 12-flowers; bracts and bracteoles lanceolate, grey-sericeous, 0.4 – 0.6 cm long, deciduous; peduncles 1 – 18 cm long, greysericeous, pedicels 0.7 – 1.5 cm long, grey-sericeous. Sepals unequal; outer three ovate, 1 – 1.1 × 0.6 – 0.8 cm, apex acute to obtuse, adaxial surface glabrous, abaxial grey-tomentose, with two black bulges, lateral basal, margins scarious, base glandular; inner two ovate to suborbicular, 1 – 1.1 × 0.6 – 0.7 cm, apex obtuse, adaxial surface glabrous, abaxial grey-tomentose in the central area, margins scarious; corolla infundibular, 6 – 7 cm long, with a pink limb, 5.5 –


DISTRIBUTION. Brazil: Rio Grande do Sul state. SPECIMENS EXAMINED. BRAZIL. Rio Grande do Sul:

Caçapava do Sul, Guaritas, 27 Dec. 2004, Soares 145 (ICN); Pelotas, Morro da Pedreira, 10 Dec. 1980, Bueno 2841 (HAS); Pelotas, 10 Dec. 1980, Mariath 877 (HAS); Porto Alegre, 10 Dec. 1979, Bueno 1969 (HAS); Porto Alegre, 2 Dec. 1977, Bueno et al. 409 (HAS); Porto Alegre, 9 Feb. 1967, Irgang (ICN 4126); Porto Alegre, Jan. 1942, Eugênio 268 (SP); Tapes, Cerro Pelado, 5 Dec. 1988, Jarenkow & Sobral 1072 (PEL). HABITAT. Mainly rocky hills with granite soil; 400 m. This vegetation is characterised by semi-deciduous forest associated with savanna (Boldrini 1997). CONSERVATION STATUS. IUCN category: Data deficient (DD). ETYMOLOGY. The specific epithet refers to the species’ restricted area of occurrence, known only from Rio Grande do Sul state. NOTES. Ipomoea riograndensis is characterised by the tomentose abaxial surface of the leaf-blade, sepals 1 – 1.1 × 0.6 – 0.8 cm and tomentose seeds. Ipomoea megapotamica differs in having a sericeous abaxial surface of the leaf blade, sepals 0.5 – 0.9 × 0.4 – 0.6 cm and glabrous seeds with long, woolly trichomes on both sides.

3. Ipomoea sulina P. P. A. Ferreira & Miotto sp. nov., affinis Ipomoea phyllomega House, sed ab ea foliis tomentosis in superficie abaxiali, sepalis externis minoribus quam internis, limbo corolla albo et tubo purpureo differt. Typus: Brazil, Rio Grande do Sul, Itati, 29°21'41.4"S 50°10'49.6"W, 31 March 2009, Ferreira 287 (holotypus ICN!; isotypi K!, LIL!, SP!). http://www.ipni.org/urn:lsid:ipni.org:names:77112479-1 Perennial woody twiners, latex white; stems 4 m long, grey-tomentose to glabrescent, simple trichomes. Leaves simple, alternate, petiole grey-tomentose to glabrescent, 5 – 17 cm long, apex glandular; leaf-blade ovate, 7 – 23 × 6 – 22 cm, adaxial surface glabrescent, abaxial grey-tomentose, entire, base cordate, apex acute to acuminate, rarely obtuse, mucronate. Cymes bearing 1 – 8-flowers; bracts and bracteoles lanceolate, glabrescent, 0.1 – 0.3 cm long, deciduous; peduncles 3 – 16 cm long, grey-tomentose to glabrescent; pedicels 1 – 3 cm long, grey-tomentose to glabrescent. Sepals unequal;

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Fig. 1. Ipomoea pampeana. A stem; B outer sepals; C inner sepals; D stamen; E gynoecium; F capsule; G seed. All drawn from P. P. A. Ferreira 143 (ICN). DRAWN BY ANELISE SCHERER.

outer three obovate to oblong, 1 – 1.4 × 0.8 – 1 cm, apex obtuse, glabrous, margins scarious, base glandular; inner two obovate, 1.5 – 1.8 × 1 – 1.4 cm, apex

obtuse, emarginate, mucronate, glabrous, margins scarious; corolla infundibular, 5 – 8 cm long, with a white limb, 6.5 – 7.5 cm in diam., and purple throat,


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Fig. 2. Ipomoea riograndensis. A stem; B outer sepals; C inner sepals; D stamen; E gynoecium; F capsule; G seed. A – E from P. P. A. Ferreira 118 (ICN); F, G from B. Irgang (ICN 4126). DRAWN BY ANELISE SCHERER.

glabrous. Stamens unequal, included, 1.7 – 2.9 cm long, the filaments fused to the base of the corolla tube, glandular-pubescent at the base. Ovary ovoid, glabrous, © The Board of Trustees of the Royal Botanic Gardens, Kew, 2011

2-locular; style 2.4 – 2.7 cm long; stigma biglobose. Capsule subglobose, subquadrangular, 4-valved, base of style forming an apiculate apex; seeds 2 – 4,

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Fig. 3. Ipomoea sulina. A stem; B trichomes on adaxial surface of leaf; C outer sepals; D inner sepals; E stamen; F gynoecium; G capsule; H seed. A, B from K. Hagelund 10912 (ICN); C – F from P. P. A. Ferreira 229 (ICN); G, H from P. P. A. Ferreira 285 (ICN). DRAWN BY ANELISE SCHERER.


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brown, 0.6 – 0.8 cm long, glabrous, with long trichomes along the margins and apex. Fig. 3. DISTRIBUTION. Brazil, in the Campos de Cima da Serra region of north-eastern Rio Grande do Sul state and southern regions of Santa Catarina. SPECIMENS EXAMINED. BRAZIL. Rio Grande do Sul: Itati, 29°21'41.4"S 50°10'49.6"W, 31 March 2009, Ferreira 287 (holotype ICN; isotypes K, LIL, SP); Barra do Ouro, 23 Jan. 1976, Hagelund 9960 (ICN); Cambará do Sul, 9 March 1988, Silveira 6573 (HAS); Itati, 27 May 2008, Ferreira 285 (ICN). Maquiné, 13 Jan. 1977, Hagelund 10912 (ICN); Riozinho, Km 45, 19 Feb. 1997, Záchia & Oliveira 2562 (SMDB); São Francisco de Paula, Potreiro Novo, 23 Feb. 1978, Sehnem 15925 (PACA); São Francisco de Paula, Serra do Umbu, 5 Feb. 1986, Mattos et al. 23138 (HAS); São Francisco de Paula, March 1968, Sehnem 10020 (PACA); São Francisco de Paula, 14 Feb. 1952, Sehnem (PACA 5867); Taquara, 18 Dec. 1949, Rambo (PACA 44809); Taquara, Feb. 1952, Rambo (PACA 52115); Terra de Areia, RS 486, Rota do Sol, 29°21'41.4"S 50°10'49.6"W, 7 March 2008, Ferreira 229 (ICN); Torres, Morro Azul, 19 Jan. 1986, Hagelund 15864 (ICN); Santa Catarina: Itapiranga, 2 Feb. 1951, Rambo (PACA 49845). HABITAT. Common in and bordering araucaria forest; 750 m. CONSERVATION STATUS. IUCN category: Data deficient (DD). ETYMOLOGY. The specific epithet refers to its occurrence in southern Brazil. NOTES. The main characteristics of Ipomoea sulina are leaves that are tomentose on the abaxial surface, external sepals that are smaller than the internal and a corolla with white limb and purple throat. Ipomoea phyllomega differs in having leaves that are glabrescent on the abaxial surface, external sepals that are larger than the internal and a corolla with a pink limb.



Acknowledgements The authors thank Anelise Scherer for the illustrations, Rafael Trevisan for the Latin diagnoses, and CNPq for the research fellowship (Produtividade em Pesquisa) granted to the second author. The authors thank the herbaria BA, BLA, CTES, HAS, HB, HBR, ICN, INPA, K, LIL, MBM, MPUC, NY, PACA, PEL, RB, S, SMDB, SP, SPF, UEC, UFRN and UPCB for access to their collections during this study. References Austin, D. F. (1975). Typification of the New World subdivisions of Ipomoea L. (Convolvulaceae). Taxon 24: 107 – 110. ____ (1979). An infrageneric classification for Ipomoea L. (Convolvulaceae). Taxon 28: 359 – 361. ____ (1980). Additional comments on infrageneric taxa in Ipomoea L. (Convolvulaceae). Taxon 29: 501 – 502. ____ & Cavalcante, P. B. (1982). Convolvuláceas da Amazônia. Publ. Avulsas Mus. Paraense Emilio Goeldi 36. ____ & Huáman, Z. (1996). A synopsis of Ipomoea L. (Convolvulaceae) in the Americas. Taxon 45: 3 – 38. Boldrini, I. I. (1997). Campos do Rio Grande do Sul: caracterização fisionômica e problemática ocupacional. Revista Brasil. Bioci. 56. Meissner, C. F. (1869). Convolvulaceae. In: C. F. P. Martius, Flora Brasiliensis 7: 200 – 424. Miller, R. E., Rausher, M. D. & Manos, P. S. (1999). Phylogenetic Systematics of Ipomoea (Convolvulaceae) Based on ITS and Waxy Sequences. Syst. Bot. 24: 209 – 227. Simão-Bianchini, R. (1998). Ipomoea L. (Convolvulaceae) no Sudeste do Brasil. Unpubl. Ph.D. Thesis. USP. São Paulo. ____ & Pirani, J. R. (2005). Duas novas espécies de Convolvulaceae de Minas Gerais, Brasil. Hoehnea 32: 295 – 300.