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  • 1. Atalahy, Anselme M.
    et al.
    Rakotonasolo, Franck
    Rabarimanarivo, Marina
    Ranarijaona, Hery Lisy
    Razafimandimbison, Sylvain
    Swedish Museum of Natural History, Department of Botany.
    Nouvelles espèces du genre Pyrostria (Rubiaceae, Vanguerieae) de Madagascar2021In: Candollea, ISSN 0373-2967, E-ISSN 2235-3658, Candollea, Vol. 76, no 1, p. 1-12Article in journal (Refereed)
    Abstract [en]

    In the course of a taxonomic revision of the genus Pyrostria Comm. ex Juss. (Rubiaceae, Vanguerieae) in Madagascar, we describe five new species endemic from the Island: Pyrostria ambohitantelensis Atalahy, Rakotonas. & Razafim., Pyrostria ambrensis Atalahy, Rakotonas. & Razafim., Pyrostria betsomangensis Atalahy, Rakotonas. & Razafim., Pyrostria coriacea Atalahy, Rakotonas. & Razafim. and Pyrostria longicorollata Atalahy, Rakotonas. & Razafim. Each new species is provided with line drawings, a discussion on its morphological affinities and a risk of extinction assessment based on the IUCN Red List criteria.

  • 2. Atalahy, Anselme
    et al.
    Rakotonasolo, Franck
    Andriambololonera, Sylvie
    Rabarimanarivo, Marina
    Ranarijaona, Hery Lisy
    Un nouveau nom dans la tribu des Vanguerieae (Rubiaceae) de Madagascar2020In: Candollea, ISSN 0373-2967, E-ISSN 2235-3658, Vol. 75, no 1, p. 71-73Article in journal (Refereed)
    Abstract [en]

    A variety of the Malagasy genus Canthium Lam. (Rubiaceae, Vanguerieae), Canthium perrieri var. louvelii Cavaco, is transferred to the genus Pyrostria Comm. ex Juss. because, like the typical variety already transferred in this genus, it shares its distinctive characters (inflorescences or solitary flowers involucrate). This taxon is further raised to species level, as it is morphologically distinct from Pyrostria perrieri (Cavaco) Razafim. et al. We provide the necessary new replacement name: Pyrostria orientalis A. Atalahy, Rakotanas. & Razafim., since the epithet louvelii is already occupied in Pyrostria.

  • 3. Gâteblé, Gildas
    et al.
    Swenson, Ulf
    Swedish Museum of Natural History, Department of Botany.
    Pichonia munzingeri (Sapotaceae), a new and rare micro-endemic species from New Caledonia2019In: Candollea, ISSN 0373-2967, E-ISSN 2235-3658, Vol. 74, p. 1-7Article in journal (Refereed)
    Abstract [en]

    Pichonia munzingeri Gâteblé & Swenson (Sapotaceae, Chrysophylloideae) is here described from the southern ultrama c massif of Grande Terre, New Caledonia. It is a micro-endemic species con ned to a small area along Oumbéa Creek in La Coulée Valley of Mont-Dore. Based on nuclear ribosomal sequence data, areolate higher leaf venation, staminodes, stamens in corolla tube ori ce, and seeds having plano-convex cotyledons, no endosperm, and no radicle, this new species is placed in Pichonia Pierre. Preliminary phylogenetic analysis places Pichonia munzingeri as the sister species to all other congeners in New Caledonia, which justi es a high conservation status from the authorities for protecting the species. Less than 50 individuals have been counted in an area a ected by the major “Montagne des Sources” anthropogenic re in late 2005. Hence, repeated res form the main threat to the existence of this new species, and it is assigned an IUCN Red List preliminary status as “Critically Endangered”. 

  • 4.
    Klackenberg, Jens
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Razafimandimbison, Sylvain
    Swedish Museum of Natural History, Department of Botany.
    New rare and threatened species of Peponidium and Pyrostria (Rubiaceae, Vanguerieae) from the drylands of Madagascar2024In: Candollea, ISSN 0373-2967, E-ISSN 2235-3658, Vol. 79, no 1, p. 53-62Article in journal (Refereed)
    Abstract [en]

    Four new species of the tribe Vanguerieae (Rubiaceae) from southern, southwestern and western Madagascar are described and illustrated. Two species belong to the genus Pyrostria Comm. ex Juss.: P. costata Klack. & Razafim. with small leaves and distinctly ribbed pollen presenters and fruits, and P. macrocarpa Klack. & Razafim. characterized by its large, obconical, 5 – 6-lobed fruits. The other two species belong to the Malagasy subendemic genus Peponidium Ar.nes: P. leroyi Klack. & Razafim., characterized by hairy leaves with ciliate margins, sparsely pubescent flowers and ribbed pollen presenters, and P. sessile Klack. & Razafim., distinct by its cordate almost sessile leaves and double-tipped corolla lobes. Risk of extinction assessments for all four species are presented, as well as the respective distribution maps.

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  • 5. Taylor, Charlotte
    et al.
    Razafimandimbison, Sylvain
    Swedish Museum of Natural History, Department of Botany.
    Barrabé, Laure
    Jardim, Jomar G.
    Barbosa, Maria Regina V.
    Eumachia expanded, a tropical genus distinct from Psychotria (Rubiaceae, Palicoureeae)2017In: Candollea, ISSN 0373-2967, E-ISSN 2235-3658, Vol. 72, p. 289-318Article in journal (Refereed)
    Abstract [en]

    The pantropical genus Margaritopsis C. Wright (Rubiaceae, Palicoureeae) was recently separated from Psychotria L. and transferred to a different tribe, Palicoureeae, based on both molecular and morphological data. Margaritopsis has been studied in the Neotropics, and in Africa as Chazaliella E.M.A. Petit & Verdc. ; the species that belong to this group in the Pacific are enumerated for the first time here. Recently Eumachia DC. was found to be an older name for this group, and a few species of Margaritopsis have been transferred nomenclaturally to that genus. Here Eumachia is surveyed comprehensively for the first time, with a list of species and an overview of morphological characteristics. The remaining species of Margaritopsis are nomenclaturally transferred here to Eumachia, along with one species of Hodgkinsonia F. Müll., one species of Mapouria Aubl., and several species of Psychotria from Asia, Australia, New Guinea, and the Pacific region. In this new circumscription Eumachia includes 83 species, and is characterized within Palicoureeae by a yellowish green drying color ; stipules that are persistent or fall by fragmentation and are generally glandular when young and hardened when old ; green to whitened inflorescence axes ; white to cream or yellowish green, often rather small corollas ; orange to red fruits ; pyrenes with marginal pre-formed germination slits and no ethanol-soluble pigments ; and non-ruminate endosperm. Eumachia includes 20 species, 8 subspecies, and 7 varieties in Africa, 27 species in the Neotropics, and 36 species and 6 varieties in Asia, Australasia, and the Pacific region. Here we publish 81 new nomenclatural combinations in Eumachia and two new synonymies for Neotropical names, and 11 names from various regions are lectotypified.

  • 6. Thulin, Mats
    et al.
    Razafimandimbison, Sylvain
    Swedish Museum of Natural History, Department of Botany.
    Bourreria scabra (Boraginaceae), a new species from southern Madagascar2017In: Candollea, ISSN 0373-2967, E-ISSN 2235-3658, Vol. 72, no 2, p. 345-350Article in journal (Refereed)
    Abstract [en]

     Bourreria scabra Thulin & Razafim.  (Boraginaceae), a new species from southern Madagascar, is described and illustrated. The plant was previously sometimes treated as conspecific with  Bourreria lyciacea Thulin [[  Hilsenbergia lyciacea (Thulin) J.S. Mill.] in Somalia and Kenya. However,  Bourreria scabra differs markedly from  Bourreria lyciacea by its smaller corolla, finely pubescent outside and with shorter lobes, by its practically unbranched style, by its smaller fruits more or less enclosed by the calyx, and by its smaller pyrenes with several low ridges forming an irregular reticulation on the outside. Bourreria scabra differs from all other species of  Bourreria P. Browne in Madagascar by the very rough upper surface of the leaves. The species is widespread in spiny dry forests in southern Madagascar, with occurrences in the Andohahela and Tsimanampetsotsa National Parks and the Beza Mahafaly Reserve. The new species is assigned the category of “Near Threatened” using the IUCN Red List Criteria.

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