Clerodendrum

Callmander, Martin W., Phillipson, Peter B. & Gautier, Laurent, 2012, Notes on the flora of Madagascar, 26, Candollea 67 (2), pp. 369-372 : 371

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