Notes on the flora of Madagascar, 26 Author Callmander, Martin W. Missouri Botanical Garden, P. O. Box 299, St. Louis, Missouri, 63166 - 0299, U. S. A & Conservatoire et Jardin botaniques de la Ville de Genève, CP 60, CH- 1292 Chambésy. Switzerland. martin.callmander@mobot.org Author Phillipson, Peter B. Missouri Botanical Garden, P. O. Box 299, St. Louis, Missouri, 63166 - 0299, U. S. A. & Muséum national d’Histoire naturelle, Département Systématique et Evolution, UMR 7205, OSEB, case postale 39, rue Cuvier 57, 75231 Paris, cedex 05, France. peter.phillipson@mobot.org Author Gautier, Laurent Conservatoireet Jardinbotaniques de laVillede Genève & Universitéde Genève, Laboratoirede botanique systématique et biodiversité, CP 60, CH- 1292 Chambésy. Switzerland. laurent.gautier@ville-ge.ch text Candollea 2012 2012-12-01 67 2 369 372 journal article 3443 10.15553/c2012v672a17 d10065ab-7097-4e15-adb5-26dc279e18da 2235-3658 5710384 Key to the genera Clerodendrum s.str. , Rotheca and Volkameria (adapted from STEANE & MABBERLEY, 1998 ; YUAN & al., 2010 ) 1. Flower buds markedly asymmetrical; corolla expanded abruptly in lower part with the anterior corolla lobe frequently much larger than the others, not resupinate; anthers basifixed (rarely versatile).................... Rotheca 1a. Flower buds symmetrical or if asymmetrical then the corolla resupinate, expanding abruptly on upper side, usually with the anterior corolla lobe only slightly (if at all) larger than the others; anthers versatile ....................... 2 2. Inflorescence commonly terminal; fruiting calyx accrescent, larger than the fruits, brightly coloured; fruit often fleshy, with bright colour contrasting with calyx............ ................................................................ Clerodendrum 2a. Inflorescence mostly axillary; fruiting calyx rarely accrescent, smaller than fruits, enclosing the fruit base and not brightly coloured; fruit usually not fleshy, not brightly coloured ...................................................... Volkameria