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 4. Abrahamia capuronii Randrian. & Lowry , spec. nova (Fig. 4). Typus : MADAGASCAR . Prov. Antsiranana : Rég. SAVA , Dist. Sambava, S de l’Anjehabe , [ 14°18’30’’S 49°44’40’’E ], c. 600 m , 7.XI.1950 , fl., Service Forestier 767 (holo-: P [ P06774827 ]!; iso-: G [ G00341710 ]!, MO- 6684132 !, NY !, P [ P06774828 , P06774829 ]!, TEF [ TEF000881 ]!) . Diagnosis Abrahamia capuronii Randrian. & Lowry can be distinguished from all other species of Abrahamia by a combination of its elliptic leaves, narrow corolla lobes (3 3 1.2 mm ), and slender inflorescence axes. Description Trees 10-15 m tall, 20 cm DBH, bark with white or translucid latex; young twigs only pubescent at the tips. Leaves alternate or sub-opposite; blade obovate to elliptic, 4-7.8 3 2-3.6 cm , chartaceous to subcoriaceous, apex rounded or retuse, margin undulate, base cuneate, adaxial surface glabrous, abaxial surface with short appressed indument, mainly along the midvein and at the base, venation craspedodromous, midvein prominent abaxially, secondary veins 18-33 pairs, 1-4 mm apart, prominent abaxially, slightly raised adaxially, tertiary veins slightly visible on adaxial surface; petiole 10-25 mm long, c. 0.5-1 mm in diam., canaliculate on adaxial surface, glabrescent. Inflorescence axillary or terminal, a panicle, 2-8 cm long, axes slender, strigose. Male flowers 5-merous, small, c. 2-2.5 mm long, subtended by a very small, pubescent bract; pedicel short, c. 0.3-0.5 mm long, pubescent; calyx lobes small, widely ovate, 1 3 1 mm , valvate, connate at the base, adaxial surface glabrous, abaxial surface sparsely covered with short indument, glabrescent; corolla lobes 3 3 1.2 mm , lanceolate, imbricate, adaxial surface glabrous, abaxial surface pubescent along its longitudinal axis or glabrescent to glabrous, white (according to field notes); stamens 5, filament c. 1.5 mm , glabrous, anthers c. 1 mm long, obloid, glabrous; disk glabrous, c. 1.2-1.5 mm in diam.; ovary rudimentary. Mature and opened female flowers unknown, developing buds with calyx lobes triangular to deltate, c. 1 3 0.5- 0.8 mm , adaxial surface glabrous, abaxial surface with some indument; corolla lobes ovate, c. 1.5 3 1 mm , mostly glabrous but abaxial surface with a few appressed short trichomes; stamens vestigial; disk glabrous; ovary depressed, ovoid, 0.3-0.5 3 0.5 mm , glabrous; style c. 1 mm , glabrous, stigmas capitate. Young fruits ellipsoid, very slightly asymmetrical, glabrous, with longitudinal striations. Etymology The species epithet honors René Capuron, whose extensive field work contributed so much to our knowledge of Madagascar’s woody flora, and who personally collected material of 24 of the 34 species of Abrahamia . 44 Boissiera 71 Distribution, ecology and phenology Abrahamia capuronii is restricted to far northeastern Madagascar ( Map 1 ), where it occurs in mid-elevation humid and transitional forests on rocky substrate up to an elevation of 700 m . Material with buds and flowers has been collected in October and early November, and specimens with young fruits have been gathered in late November. Conservation status With an EOO of 2,585 km ² and a minimum AOO of 24 km ², A. capuronii would qualify as “Endangered” under Criteria B1 and B2 of the IUCN Red List ( IUCN , 2012 ) if other qualifying criteria were met. However, it is known from a total of 6 locations, one of which is situated within a protected area (Loky Manambato) while the others are at sites potentially subjected to clearing and habitat degradation, and should thus be assigned a preliminary status of “Vulnerable’’ [VU B1ab(iii)+2ab(iii)]. Notes Abrahamia capuronii resembles both A. grandidieri and A. sericea by its relatively closely spaced, parallel and craspedodromous secondary veins, but can be distinguished from these two species by its smaller number of secondary veins ( 10-33 in A. capuronii vs 35-40(-47) in A. grandidieri and 40-70 in A. sericea ). Paratypi MADAGASCAR . Prov. Antsiranana : Mont Anjenabe , [ 14°17’S 49°46’E ], 650 m , 3-7. XI.1950 , fl., Humbert 24055 ( G , K , MO , P [2 sheets], TAN ) ; Vohémar , forêt de Binara , 13°15’S 49°37’E , 700 m , 8.XI.2001 , fl., Gautier et al. 4125 ( G , MO , TAN ) ; Vohémar, Analamazava forest , 13°15’43’’S 49°35’22’’E , 25.XI.2004 , y. fr., Ranarivelo 446 ( MO ) ; Daraina , Ambilobe , 13°44’10’’S 49°23’07’’E , 1299 m , 27.X.2007 , bud, Randriambololomamonjy et al. 166 ( MO , P , TAN ) ; Vohémar , Daraina , forêt d’Analamazava , [ 13°15’58’’S 49°36’14’’E ], 700 m , 29.X.2005 , fl., Randrianaivo 1259 ( CNARP , MO , P , TAN ) ; Vohémar , Daraina , forêt d’Antsahabe , 13°12’37’’S 49°33’29’’E , 545 m , 31.X.2005 , fl., Razafitsalama 741 ( CNARP , MO , P , TAN ) ; Vohémar , Andrafainkona , Ampisarahana , 13°38’28’’S 49°31’51’’E , 1009 m , 9.XI.2007 , bud, Razakamalala et al. 3716 ( G , MO , P , TAN ) .