A taxonomic revision of the Malagasy endemic genus Micronychia (Anacardiaceae) Author Randrianasolo, Armand Missouri Botanical Garden, P. O. Box 299, St. Louis, Missouri 63166 - 0299, U. S. A. randrian@mobot.org. text Adansonia 2000 3 2000-06-30 22 1 145 155 journal article http://doi.org/10.5281/zenodo.4605738 1639-4798 4605738 Micronychia tsiramiramy H. Perrier Mém. Mus. Hist. Nat. Paris 18: 267 (1944). — Lectotype (here designated): Gouvernement Général de Madagascar 56, Madagascar , Toamasina Prov. , forêt d’Analamazaotra , fl. (P!; iso-, P!). Trees or shrubs, 2-20 m tall; young twigs glabrous, sometimes with lenticels and fine pubescence at the tip, bark with translucide latex. Leaves coriaceous or subcoriaceous, persistent; blades oblanceolate to obovate, narrowly elliptic or elliptic, 2-11.5 cm long, 1-5.3 cm wide, apex emarginate, retuse, rounded or shortly acuminate, base acute to cuneate decurrent, margin entire; adaxial and abaxial surfaces glabrous. Venation pinnate and craspedodromous, midvein prominent below, 9-11 secondary veins, 3-8 mm apart, arcuate or more or less parallel, prominent below, forming an obtuse angle with the midrib at the leaf base, tertiary veins ramified, admedial, some veins connected with others’ branches. Petiole 3-15 mm long, canaliculate or shallowly channeled, glabrous to glabrescent. Inflorescence axillary, subterminal or terminal, pendent, paniculate, with zigzag rachis, 1.5-9 cm long, branches flattened, sometimes regular, glabrous or glabrescent; bracts triangular or deltate, 0.5-2 mm long, 0.5-1 mm wide, abaxially setulose. Flowers 5- merous, unisexual; pedicel 0.2-1.5 mm long, glabrous or pubescent; calyx lobes very widely or widely depressed ovate, 1-2.5 mm long, 1-2.5 mm wide, abaxially glabrous, imbricate; corolla lobes ovate to oblong or obovate, 3-5 mm long, 1.5-3 mm wide, abaxially glabrous, pink, imbricate or quincuncial; stamens 5; in staminate flowers filaments 1.5-2 mm long, straight, flattened and broadened at the base, inserted basally on the outer surface of the disk, glabrous, white; anthers 1-2 mm long, oblong to slightly ovate and curved, yellow, glabrous, dorsifixed, introrse, dehiscent by longitudinal slits; disk shallowly cup-shaped or cupiliform, 1-1.5 mm in diam., glabrous, ovary rudimentary; in pistillate flowers filaments 1-1.5 mm long, straight, flattened and broadened at the base, glabrous, white, inserted basally on the outer surface of the disk; anthers 0.5-1 mm long, ovate, yellow, glabrous; disk annular and cup-shaped, ca. 1.5 mm in diam., glabrous; ovary widely depressed to depressed ovate or very widely ovate, laterally compressed and asymmetrically oblique, 1-2 mm long, 1 mm broad, glabrous, unilocular, with 1 anatropous ovule with a long funicle, placentation parietal; the single style trifid, lateral or latero-subapical, 1- 1.5 mm long, glabrous; stigmas 3 lobed and capitate. Fruits drupaceous, 0.8-1.4 cm long, 0.6-1.5 cm broad, asymmetric and mango-shaped, surface with longitudinal striations, glabrous, mesocarp resinous, endocarp thin. Micronychia tsiramiramy is distinguished from the other species of Micronychia by having leaves that are glabrous on both surfaces with a decurrent base and a retuse, emarginate, rounded or shortly acuminate apex. Two varieties were described by PERRIER DE LA BÂTHIE (1944) , both of which are recognized here. They are easily distinguishable by leaf and floral characters, but the differences are not sufficient to justify recognizing them as separate species.