| 1 | Sepals and petals always 4. |
| 1' | Sepals and petals usually 5. |
| 2 | Leaves not densely imbricate, stems clearly visible. |
| 2' | Leaves densely imbricate, stems not visible. |
| 3 | Sepals shorter than petals; pedicels ± densely pubescent. |
| 3' | Sepals longer than petals; pedicels glabrous. |
| 4 | Flowers axillary, solitary; leaves not more than 15 mm long. |
| 4' | Flowers 2-4 in a terminal monochasium; leaves on non-flowering shoots 8-45 mm long. |
| 5 | Sepals not strongly nerved, only slightly white-dotted; capsule longer than sepals. |
| 5' | Sepals strongly white-dotted, prominently nerved; capsule shorter than sepals. |
| 6 | Leaves erect; pedicels 6-20 mm; sepals with apex obtuse to cucullate |
| 6' | Leaves patent; pedicels 4 mm; sepals with apex acute. |
