| 1 | Style with stigma 2.5-4.5 cm long |
| 1' | Style with stigma not more than 1.6 cm long |
| 2 | Stigma branches undivided |
| 2' | Stigma branches fimbriate |
| 3 | Labellum 10-12 cm long, apical part 5 cm wide; sepals 11-14 cm long |
| 3' | Labellum c. 6 cm long, apical part c. 2.2 cm wide; sepals 6-6.5 cm long |
| 4 | Ovary 8-12 cm long including extension; sepals 6-10 cm long |
| 4' | Ovary 2-5.5 cm long including extension; sepals 2.5-3 cm |
| 5 | Stigma lobes bilobed with a small tooth in the sinus; ovary c. 5.5 cm long including extension |
| 5' | Stigma lobes finely toothed; ovary 2-2.5 cm long including extension |
