Taxonomic treatment of Abrahamia Randrian. & Lowry, a new genus of Anacardiaceae from Madagascar Author Randrianasolo, Armand William L. Brown Center, Missouri Botanical Garden, P. O. Box 299, St. Louis, MO, 63166 - 0299, U. S. A. armand.randrianasolo@mobot.org Author Lowry II, Porter P. Africa and Madagascar Program, Missouri Botanical Garden, P. O. Box 299, St. Louis, MO, 63166 - 0299, U. S. A. & Institut de Systématique, Evolution, Biodiversité (ISYEB), UMR 7205, Centre national de la Recherche scientifique / Muséum national d’Histoire naturelle / École pratique des Hautes Etudes, Université Pierre et Marie Curie, Sorbonne Universités, C. P. 39, 57 rue Cuvier, 75231 Paris CEDEX 05, France. Author Schatz, George E. Africa and Madagascar Program, Missouri Botanical Garden, P. O. Box 299, St. Louis, MO, 63166 - 0299, U. S. A. text Boissiera 2017 2017-12-27 71 1 152 journal article http://doi.org/10.5281/zenodo.7618113 978-2-8277-0087-5 0373-2975 7618113 28. Abrahamia revoluta Randrian. & Lowry , spec. nova ( Fig. 25 ). Typus : MADAGASCAR . Prov. Antsiranana : Rég. SAVA , Vohémar , forêt littoral au S de Vohémar , [ 13°21’S 50°00’E ], 1-19.XII.1966 , fr., Service Forestier 24318A (holo: P [ P06168913 ]!; iso-: MO- 05056713 !). Diagnosis Abrahamia revoluta Randrian. & Lowry can be distinguished from its congeners by its glabrous leaves with undulate and revolute margins and semicraspedodromous secondary veins. Description Trees 15-20 m tall, 21.6 cm DBH; young twigs glabrous, lenticellate. Leaves opposite or subopposite; blade obovate, 3.2-9 3 1.4-3.8 cm , subcoriaceous, apex retuse, sometimes emarginate, margin revolute, undulate, base cuneate, both surfaces glabrous, venation semicraspedodromous, midvein prominent abaxially, secondary veins 15-30 pairs, more or less parallel, 2-4(-5) mm apart, raised on both leaf surfaces, tertiary veins not visible on both surfaces; petiole 5-13 mm long, 0.5-1 mm in diam., canaliculate on adaxial surface, usually glabrous. Inflorescence and flowers unknown. Infrutescence terminal. Fruits 2.5-2.7 3 1.3-1.5 cm , glabrous, with longitudinal striations. Distribution, ecology and phenology Abrahamia revoluta occurs in NE Madagascar from S of Vohémar to the southern part of the Masoala peninsula ( Map 9 ). Fruiting material has been gathered between October and December. Conservation status Abrahamia revoluta has a minimum AOO of 12 km 2 and only one of its three extant subpopulation occurs within a protected area (Masoala) whereas the other two were collected in areas where future decline is expected in terms of quality of habitat. It has therefore been assigned a preliminary status of “Endangered’’ [EN B2ab(iii)] using the IUCN Red List Categories and Criteria ( IUCN, 2012 ). Notes Abrahamia revoluta most closely resembles A. ditimena , with which it shares obovate leaves with a retuse apex that are similar in size and the number of secondary veins. However, A. revoluta differs by its subcoriaceous (vs coriaceous) leaves, semicraspedodromous (vs craspedodromous) venation, revolute and undulate (vs entire and flat) leaf margins, obscure (vs raised and visible) tertiary venation on the lower leaf surface, terminal (vs terminal or axillary) infrutescences, and glabrous (vs velutinous) fruits. Paratypi MADAGASCAR . Prov. Antsiranana : versant NW de la Montagne d’Ambre , forêt d’Ankarefo (Ankazobe), 19-21.X.1954 , y. fr., Service Forestier 11357bis ( P , MO ). Prov. Toamasina : Maroantsetra , Masoala Peninsula , S of Ambanizana , 15°40’24’’S 49°57’51’’E , 110- 260 m , 29.XI.1994 , ster., Vasey et al. 176 ( MO , TAN ).