Notes on the genus Ochna L. (Ochnaceae) in Madagascar Author Callmander, Martin, W. Missouri BotanicalGarden, P. O. Box 299, St. Louis, Missouri, 63166 - 0299, U. S. A. and Conservatoire etJardin botaniques de la Ville de Genève, ch. de l’Impératrice 1, case postale 60, 1292 Chambésy, Genève. Switzerland. martin.callmander@mobot.org Author Phillipson, Peter B. Missouri Botanical Garden, P. O. Box 299, St. Louis, Missouri, 63166 - 0299, U. S. A. and Muséum national d’Histoire naturelle, Département Systématique et Evolution, UMR 7205 OSEB, case postale 39, rue Cuvier 57, 75231 Paris, cedex 05, France text Candollea 2012 2012-07-01 67 1 142 144 journal article 3270 10.15553/c2012v671a14 012626c5-792b-45f3-b7e6-16ec61420de8 2235-3658 5789051 Ochna louvelii (H. Perrier) Callm. & Phillipson , comb. nova Ξ Diporidium louvelii H. Perrier in Not. Syst. (Paris) 10: 35. 1941. Typus: MADAGASCAR . Prov. Toamasina : Centre Est , Analamazaotra , s.d., Louvel 25 ( holo- : P [ P00048443 ]!). Observations. – Ochna louvelii seems to be a narrow endemic known only from a couple of collections from the humid montane forests around Moramanga on the eastern escarpment. This species differs from O. polycarpa Baker , which occurs in the same region but extends southwards on the highlands to near Fianarantsoa , by its lax inflorescence (vs. contracted in O. polycarpa ) with c. 10-20 minute flowers with sepals> 5 mm (vs. 1-5 larger flowers with sepals 8- 10mm ),and from O. thouvenotii by itssmaller leaves (1-2 × 0.8-1.5 cm vs. 3-4.5 cm × 1-2.5 cm ) and its many-flowered inflorescences (10-20 vs. 1-5 flowers).