Comparative floral ontogeny in Detarieae (Leguminosae: Caesalpinioideae).: 2.: Zygomorphic taxa with petal and stamen suppression

Marked floral zygomorphy and a reduced number of petals and/or stamens are the character traits that distinguish the taxa described (species of Afzelia. Berlinia, Gilbertiodendron. Macrolobium, Neochevalierodendron. Paramacrolobium, Phyllocarpus, and Tetraberlinia). All have an Omega-shaped floral apex after bracteole initiation. bracteoles large when initiated, helical sepal initiation, unidirectional petal initiation (simultaneous in Afzelia, not determinable in Tetraberlinia), and unidirectional stamen initiation Floral zygomorphy is expressed primarily by one petal being much larger than the others and by suppresion of several of the stamens. Five petals are initiated in all: suppression begins in late development. Either two petals Phyllocarpus) or four petals (Afzelia, Berlinia, Macrolobium, Tetraberlinia) are suppressed. All ten stamens Lire initiated: at midstage, suppression begins in either three stamens (Afzelia) or seven stamens (Gilbertiodendron. Macrolobium, Paramacrolobium), Other of zygomorphy may include diadelphy, stamen filament connation late in development. or displacement (if the carpel front a central position to file adaxial side of the hypanthium. There is no loss of organs similar to that which occurs in some other Detarieae.