| 1 | Inflorescence ≤ 5 cm long |
| 1' | Inflorescence > 5 cm long |
| 2 | Leaves narrow ovate to linear, apex long acuminate to caudate, 2.5-19 times as long as wide. — Milne Bay District |
| 2' | Leaves elliptic to oblong, apex shortly acuminate, 1.7-2.7(-3.8) times as long as wide. — Papua |
| 3 | Corolla tube wider than head in bud; leaves broad ovate or elliptic |
| 3' | Corolla tube more or less same width as head in bud; leaves variable |
| 4 | Stamens inserted at or above middle of corolla tube; filaments 0.6-0.7 mm long; corolla tube 2.7-3.2 mm long |
| 4' | Stamens inserted below middle of corolla tube; filaments 1.5-2.4 mm long; corolla tube 1.9-2.7 mm long |
| 5 | Flowers densely clustered at inflorescence tips |
| 5' | Flowers not densely clustered at inflorescence tips |
| 6 | Anther base of broad inward curving tails; leaves elliptic to obovate, 2.7-5.3 times as long as wide |
| 6' | Anther base of long, thin outward curving tails; leaves usually narrowly linear or elliptic, 2.3-18 times as long as wide |
