Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.
| 1 Corolla tube 5-12 cm long. |
| ..2 Corolla tube white or cream; flowers axillary, subtended by leaf-like bracts, the ‘inflorescence’ elongate; leaf blades lanceolate, 4-10× as long as wide |
| ..2 Corolla tube pinkish to red; flowers in a terminal and hemispheric compound cyme; leaf blades ovate, 1.5-3× as long as wide |
| 1 Corolla tube < 3 cm long. |
| ....3 Corolla white or pale pink. |
| ......4 Shrub to 1 (-3) m tall; inflorescence 3-6 cm long; corolla doubled or additional ‘multiple’ |
| ......4 Shrub or small tree to 10 m tall; inflorescence 8-18 cm long; corolla single |
| ....3 Corolla strongly pink, red, or orange. |
........5 Corollas pink or pinkish-red; inflorescence compact and hemispheric, as wide or wider than long |
| ........5 Corollas orange or orangey-red; inflorescence with an obvious central axis, longer than wide. |
| ..........6 Leaves densely pubescent |
| ..........6 Leaves sparsely pubescent |
| ............ 7 Leaves cordate, unlobed |
| ............ 7 Leaves 5-lobed |