KEY TO THE SPECIES

1Petals 5. Stamens 10. Ovaries 5. (Sect. Brackenridgea).
1'Petals 5-7-(10). Stamens 10-45. Ovaries 5-10. (Sect. Notochnella).
2Inflorescences never axillary, but sometimes terminal on short side-branches.
2'Axillary inflorescences always present when in fertile state.
3Inflorescences made up of many-flowered cymes, the pedicels in 2 or more tiers. Leaves mostly 7½-20 cm long.
3'Inflorescences made up of 3(-5)-flowered cymes, the pedicels in 1 tier. Leaves mostly 4-12½ cm long