| 1 | Styles united; stigma capitate; stem robust, 1-2 mm diam.; capsule 5-8 mm diam. |
| 1' | Styles 2, free; stem slender, up to 1 mm diam.; capsule 1.3-4 mm diam. |
| 2 | Stigmas capitate; capsule c. 4 mm diam. |
| 2' | Stigmas elongate, cylindrical, not thicker than style; capsule c. 1.3-1.5 mm diam. |
| 3 | Corolla lobes (3-)4(-5), connivent or suberect; anthers almost orbicular, scarcely longer than wide; flowers in small irregular clusters |
| 3' | Corolla lobes (4-)5, spreading; anthers oblong, distinctly longer than wide; flowers in dense, compact clusters |
