subsect. Centrosperma R. Keller

Shrubs with leaves articulated at base, deciduous; inflorescence- branching dichasial (or mixed dichasial/pseudo-dichotomous in 10. H. limosum), mainly basipetal; sepals 5 (very rarely 4), very unequal to subequal or rarely equal, deciduous; petals 5 (rarely 4); stamens 30-650, deciduous; styles and placentae (2)3-5(6), placentation incompletely axile to parietal. Species 1-14.