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Three New Species of Begonia Sect. Erminea (Begoniaceae) from North-East Madagascar

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Three New Species of Begonia Sect. Erminea (Begoniaceae) from North-East Madagascar adansonia 2019 ● 41 ● 7 DIRECTEUR DE LA PUBLICATION : Bruno David Président du Muséum national d’Histoire naturelle RÉDACTEUR EN CHEF / EDITOR-IN-CHIEF : Thierry Deroin RÉDACTEURS / EDITORS : Porter P. Lowry II ; Zachary S. Rogers ASSISTANTS DE RÉDACTION / ASSISTANT EDITORS : Emmanuel Côtez ([email protected]) ; Anne Mabille MISE EN PAGE / PAGE LAYOUT : Emmanuel Côtez COMITÉ SCIENTIFIQUE / SCIENTIFIC BOARD : P. Baas (Nationaal Herbarium Nederland, Wageningen) F. Blasco (CNRS, Toulouse) M. W. Callmander (Conservatoire et Jardin botaniques de la Ville de Genève) J. A. Doyle (University of California, Davis) P. K. Endress (Institute of Systematic Botany, Zürich) P. Feldmann (Cirad, Montpellier) L. Gautier (Conservatoire et Jardins botaniques de la Ville de Genève) F. Ghahremaninejad (Kharazmi University, Téhéran) K. Iwatsuki (Museum of Nature and Human Activities, Hyogo) K. Kubitzki (Institut für Allgemeine Botanik, Hamburg) J.-Y. Lesouef (Conservatoire botanique de Brest) P. Morat (Muséum national d’Histoire naturelle, Paris) J. Munzinger (Institut de Recherche pour le Développement, Montpellier) S. E. Rakotoarisoa (Millenium Seed Bank, Royal Botanic Gardens Kew, Madagascar Conservation Centre, Antananarivo) É. A. Rakotobe (Centre d’Applications des Recherches pharmaceutiques, Antananarivo) P. H. Raven (Missouri Botanical Garden, St. Louis) G. Tohmé (Conseil national de la Recherche scientifique Liban, Beyrouth) J. G. West (Australian National Herbarium, Canberra) J. R. Wood (Oxford) COUVERTURE / COVER : Begonia ambodiforahensis Scherber. & Duruiss., sp. nov., habit and female flower. Adansonia est indexé dans / Adansonia is indexed in: – Science Citation Index Expanded (SciSearch®) – ISI Alerting Services® – Current Contents® / Agriculture, Biology, and Environmental Sciences® – Scopus® Adansonia est distribué en version électronique par / Adansonia is distributed electronically by: – BioOne® (http://www.bioone.org) Adansonia est une revue en flux continu publiée par les Publications scientifiques du Muséum, Paris Adansonia is a fast track journal published by the Museum Science Press, Paris Les Publications scientifiques du Muséum publient aussi / The Museum Science Press also publish: Geodiversitas, Zoosystema, Anthropozoologica, European Journal of Taxonomy, Naturae, Cryptogamie sous-sections Algologie, Bryologie, Mycologie. Diffusion – Publications scientifiques Muséum national d’Histoire naturelle CP 41 – 57 rue Cuvier F-75231 Paris cedex 05 (France) Tél. : 33 (0)1 40 79 48 05 / Fax : 33 (0)1 40 79 38 40 [email protected] / http://sciencepress.mnhn.fr © Publications scientifiques du Muséum national d’Histoire naturelle, Paris, 2019 ISSN (imprimé / print) : 1280-8571/ ISSN (électronique / electronic) : 1639-4798 Three new species of Begonia sect. Erminea (Begoniaceae) from north-east Madagascar David SCHERBERICH Jardin Botanique de Lyon, Mairie de Lyon, F-69205 Lyon cedex 01 (France) [email protected] Jacky DURUISSEAU† 24, rue de La Romade, F-17240 Bois (France) Submitted on 24 August 2018 | accepted on 16 November 2018 | published on 3 June 2019 Scherberich D. & Duruisseau† J. 2019. — Three new species of Begonia sect. Erminea (Begoniaceae) from north-east Madagascar. Adansonia, sér. 3, 41 (7): 59-67. https://doi.org/10.5252/adansonia2019v41a7. http://adansonia.com/41/7 ABSTRACT Three new species ofBegonia section Erminea A.DC. from north-east Madagascar are described and illustrated. They share a tuberous habit, four tepaled male flowers and six tepaled female flowers, which are typical of that section. Begonia ambanizanensis Scherber. & Duruiss., sp. nov. differs from the other species in that section by the symmetric, sub-orbicular, succulent leaf blades. Begonia ambodiforahensis KEY WORDS Begoniaceae, Scherber. & Duruiss., sp. nov. is compared to B. antongilensis Humbert and B. erminea L’Hér. but Begonia, it differs from both by the combination of an acaulescent habit and the numerous lanceolate leaves Madagascar, with red margins and spiculiform red hairs on the blade. Begonia harimalalae Scherber. & Duruiss., Masoala, Makira, sp. nov. is also compared to B. erminea from which it differs by the thicker, larger leaves, which are new species. glabrous, with the margins shallowly and sparsely serrate vs densely biserrate. RÉSUMÉ Trois nouvelles espèces de Begonia sect. Erminea (Begoniaceae) du nord-est de Madagascar. Trois nouvelles espèces de Begonia de la section Erminea A.DC. du nord-est de Madagascar sont décrites et illustrées. Elles partagent le port tubéreux, les fleurs mâles à quatre tépales et femelles à six tépales qui sont typiques de cette section. Begonia ambanizanensis Scherber. & Duruiss., sp. nov. diffère des autres espèces de cette section par les limbes des feuilles sub-orbiculaires, symétriques et succulents. Begonia ambodiforahensis Scherber. & Duruiss., sp. nov. est comparé à B. antongilensis MOTS CLÉS Begoniaceae, Humbert et B. erminea L’Hér. mais diffère des deux par la combinaison de son port acaulescent et les Begonia, nombreuses feuilles lancéolées à bordures rouges et poils rouges spiculiformes sur le limbe. Begonia Madagascar, harimalalae Scherber. & Duruiss., sp. nov. est également comparé à B. erminea dont il diffère par les Masoala, Makira, feuilles plus grandes et plus épaisses, qui sont glabres avec les bords légèrement et éparsement serrés espèces nouvelles. vs densément bi-serrés. ADANSONIA, sér. 3 • 2019 • 41 (7) © Publications scientifiques du Muséum national d’Histoire naturelle, Paris. www.adansonia.com 59 Scherberich D. & Duruisseau† J. Begonia ambanizanensis Scherber. & Duruiss., sp. nov. Begonia ambodiforahensis Scherber. & Duruiss., sp. nov. Analanjirofo Begonia harimalalae Scherber. & Duruiss., sp. nov. Maroantsetra Sava Nosy Mangabe Antongila Bay 15 km FIG. 1. — Geographic distribution of Begonia ambanizanensis Scherber. & Duruiss., sp. nov., Begonia ambodiforahensis Scherber. & Duruiss., sp. nov. and Begonia harimalalae Scherber. & Duruiss., sp. nov. in north-east Madagascar. INTRODUCTION The recognition of these new species brings to 55 the number of Begonia species for the flora of Madagascar and to 13 the number Begonia L. is one of the largest genera of angiosperms, comprising of species for the flora of Masoala Keraudren-Aymonin( 1983). as of today 1899 recognized species (Hughes et al. 2015), dis- These include B. ambanizanensis Scherber. & Duruiss., sp. nov., tributed in the tropics and subtropics. Recent studies on Begonia B. ambodiforahensis Scherber. & Duruiss., sp. nov., B. antongilensis from Madagascar have led to the recognition and description of Humbert, B. bogneri Ziesenh., B. erminea L’Hér., B. henrilaportei several new species (Hughes 2011; Scherberich & Duruisseau Scherber. & Duruiss., Begonia keraudreniae Bosser, B. lyallii A. 2016, 2017), all from the northeastern tropical humid forests DC., B. masoalaensis M.Hughes, B. nana L’Hér., B. nosyman- of the Masoala Peninsula. The area has however still been little gabensis Scherber. & Duruiss., B. pteridoides Scherber. & Du- explored. Collections have mostly been made only in the relative ruiss. and B. tsimihety Humbert. Among these, B. henrilaportei periphery of the Masoala National Park, and further exploration and B. lyallii are members of section Nerviplacentaria A.DC., in the heart of the park will certainly reveal more novelties. Two of B. masoalaensis is unplaced yet, while the remaining species all these are described here as B. ambanizanensis Scherber. & Duruiss., belong to section Erminea. With 10 out of the 17 recognized sp. nov. and B. ambodiforahensis Scherber. & Duruiss., sp. nov. species belonging to that section (Moonlight et al. 2018), the Another major area of exceptional biodiversity lies west of Masoala Peninsula obviously appears as the center of distribution the Masoala peninsula. Created in 2012, the Makira Natural of Begonia sect. Erminea. Most of them have relatively restricted Park covers 372,470 hectares of low and mid-altitude rainforest. geographical ranges, many being endemic from the peninsula, Preliminary estimations suggest that the Makira forest would and several are only known from the type locality. have the highest level of species diversity and could contain around 50% of Madagascar’s floral biodiversity (Meyers 2001). Begonia harimalalae Scherber. & Duruiss., sp. nov. from the SYSTEMATICS southern part of the Makira forest is here described as a new species (Fig. 1). Begonia ambanizanensis Scherber. & Duruiss., sp. nov. The three here newly described species belong to Begonia section (Fig. 2) Erminea which is defined by the following characteristics (De Candolle 1859): tuberous habit; male flowers with four tepals, Begonia ambanizanensis Scherber. & Duruiss., sp. nov. shares usually with monadelphous stamens; female flowers with 6 tepals with B. antongilensis var. antongilensis the tuberous habit, with with 3 bifid styles and lunulate stigma; fruit a capsule unequally sub-caulescent stems, the symmetric, basally rounded to scarcely 3-winged dehiscent from the valve opposite to the main wing. cordate blades, the number of perianth segments in male and 60 ADANSONIA, sér. 3 • 2019 • 41 (7) Three new Begonia sect. Erminea from Madagascar C FG D B H E A FIG. 2. — Begonia ambanizanensis Scherber. & Duruiss., sp. nov. : A, habit; B, leaf, adaxial side; C, male flower, front view;D , male flower, side view;E , androe- cium; F, female flower, face view; G, female flower, side view; H, styles and stigmas; A-H, Schatz et al. 3381 (Drawing: Vanessa Damianthe). ADANSONIA,
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