1 | Petals 5. Stamens 10. Ovaries 5. (Sect. Brackenridgea). |
1' | Petals 5-7-(10). Stamens 10-45. Ovaries 5-10. (Sect. Notochnella). |
2 | Inflorescences never axillary, but sometimes terminal on short side-branches. |
2' | Axillary inflorescences always present when in fertile state. |
3 | Inflorescences 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 |