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Bombacoideae, Malvaceae) No Sudeste Do Brasil: Resultados Preliminares

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Bombacoideae, Malvaceae) No Sudeste Do Brasil: Resultados Preliminares 64º Congresso Nacional de Botânica Belo Horizonte, 10-15 de Novembro de 2013 O CLADO PACHIRA (BOMBACOIDEAE, MALVACEAE) NO SUDESTE DO BRASIL: RESULTADOS PRELIMINARES Thaís M. Macedo 1,*, Marília C. Duarte 1 1 Universidade de Mogi das Cruzes, Laboratório de Sistemática Vegetal - LSV, São Paulo, Brasil; *[email protected] (K. Schum.) A. Robyns, E. parvifolia (Mart & Zucc.) A. Introdução Robyns, E. pentaphylla (Vell. emend. K. Schum.) A. Robyns, E. pubescens (Mart. & Zucc.) Schott & Endl, e E. saxicola Carv.-Sobr. A taxonomia das espécies está Malvaceae s.l. compreende nove subfamílias, sendo sendo baseada principalmente nos caracteres dos caracterizada pela presença de um nectário constituído de folíolos, tubo estaminal, cálice e indumento. Pachira Aubl. tricomas glandulares, localizado internamente na base do apresenta distribuição neotropical e possui 26 espécies. cálice ou menos comumente nas pétalas ou no Pode ser reconhecida por apresentar folíolos com androginóforo [1]. Bombacoideae, uma das nove articulações, pétalas planas e numerosos estames subfamílias de Malvaceae, inclui cerca de 18 gêneros e agrupados em 10 falanges a partir do tubo estaminal. Até 187 espécies, com distribuição predominantemente o momento foram encontradas cinco espécies para o neotropical e caracterizada pela presença de folhas Sudeste, Pachira aquatica Aubl., P. calophylla (K. palmadas compostas [2]. No Brasil, ocorrem 13 gêneros e Schum.) Fern. Alonso, P. glabra Pasq., P. retusa (Mart. & 80 espécies distribuídas em todas as regiões, sendo os Zucc.) Fern. Alonso, e P. stenopetala Casar. centros de diversidade as regiões Norte e Nordeste [3]. Um recente estudo realizado através da análise molecular baseado em sequências de DNA nuclear e plastidial, Conclusões mostrou que os gêneros Eriotheca e Pachira formam um clado denominado Pachira s.l., cuja sinapomorfia morfológica são as sementes estriadas [4]. Desde que a Até o momento, foram visitados 11 herbários e analisadas nova delimitação incluindo os dois gêneros em um só aproximadamente 1.050 coleções. Foram reconhecidas clado foi proposta, ainda não existem trabalhos de cunho 13 espécies para a região Sudeste, distribuídas revisional que abordem essa nova circunscrição. Deste predominantemente no Cerrado, sendo o Estado de modo, o objetivo deste trabalho é realizar a revisão Minas Gerais o que concentra o maior número de táxons taxonômica das espécies do clado Pachira que ocorrem (nove espécies). no Sudeste do Brasil, uma vez que a região abriga uma grande porcentagem das espécies, entretanto carece de Agradecimentos informações completas. À CAPES e à UMC, pela bolsa concedida à primeira autora. Metodologia Referências Bibliográficas Estão sendo utilizados os procedimentos usuais em trabalhos taxonômicos, incluindo: levantamento bibliográfico, coleta de material e visita aos principais [1] Alverson, W.S.; Whitlock, B.A.; Nyffeler, R.; Bayer, C.; Baum, herbários da região Sudeste (São Paulo: SP, SPF, SPSF, D.A. 1999. Phylogeny of the core Malvales: evidence from ndh F sequence data. Amer. J. Bot . 86 (10): 1474-1486. UEC, ESA, HPL, HRCB, SJRP, BOTU. Rio de Janeiro: RB [2] Baum, D.A.; Smith, S.D.; Yen, A.; Alverson, W.A.; Nyffeler, R.; e R. Minas Gerais: OUPR, CESJ, BHCB, VIC e Espírito Whitlock, B.A.; Oldham, R.L. 2004. Phylogenetic relationships of Santo: MBML, CVRD e VIES) [5]. Além disso, está sendo Malvatheca (Bombacoideae and Malvoideae, Malvaceae sensu realizado o estudo morfológico de estruturas vegetativas e lato) as inferred from platid DNA sequences. Amer. J. Bot. 91 reprodutivas e, o tratamento taxonômico que constará: (11): 1863-1871. citação do material-tipo, sinonímias, descrições dos [3] Duarte, M.C . 2010 Análise filogenética de Eriotheca Schot táxons, comentários sobre variabilidade morfológica, & Endl. e gêneros afins (Bombacoideae, Malvaceae) e estudo relações taxonômicas, habitat e distribuição geográfica, taxonômico de Eriotheca no Brasil. Tese de Doutorado. Programa de Pós-Graduação em Biodiversidade Vegetal e Meio além de ilustrações dos principais caracteres diagnósticos Ambiente. Instituto de Botânica. 190p. das espécies. [4] Duarte, M.C.; Esteves, G.L.; Salatino, M.F.L.; Walsh, K.; Baum, D.A. 2011. Phylogenetic analyses of Eriotheca Schott & Endl. and related genera (Bombacoideae, Malvaceae). Syst. Bot. Resultados e Discussão 36(3):690-701. [5] Thiers, B. [continuously updated]. Index Herbariorum: A global Eriotheca Schott & Endl. compreende cerca de 24 directory of public herbaria and associated staff. New York espécies distribuídas na região Neotropical. O gênero Botanical Garden's Virtual Herbarium. http://sweetgum.nybg.org/ih/ caracteriza-se principalmente pelas flores com até 5,5 cm compr., estames em número de 18-155, parcialmente concrescidos em tubo e depois livres entre si e pelo fruto do tipo cápsula com endocarpo lanoso e abundante. Até o presente, foram reconhecidas oito espécies distribuídas no sudeste: Eriotheca candolleana (K. Schum.) A. Robyns, E. gracilipes (K. Schum.) A. Robyns, E. longipes (A. Robyns) M.C. Duarte & G.L. Esteves, E. macrophylla .
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