| 1 | Twigs with faint swellings or without; ridges faint or fairly distinct. Leaves and flowers coriaceous. — Papua New Guinea (Western Highlands Prov.: Mt Hagen and vicinity; c. 2000 m). |
| 1' | Twigs with ant-swellings, generally with an opening. |
| 2 | Male buds not particularly narrow, 8-14 by (3-)4-5 mm; bracteole generally caducous; androphore about half as long as the synandrium; anthers 7-12. — Lowland to 2000 m altitude. |
| 2' | Male buds slender, tubiform, 12-15 by (2-)2.5-3.5 mm; bracteole persistent or caducous; androecium slender, androphore (much) longer than half the length of the synandrium; anthers 4-6. [Fruits not known, possibly 1.5-2 cm long.] — Lowland and lower montane areas. |
| 3 | Fruits 2.5-3 cm long. [Flowers not known with certainty, possibly similar to type variety.] — Montane areas. |
| 3' | Fruits 1.5-2(-2.5) cm long. — Lowland and montane areas. |
| 4 | Male inflorescences sessile. |
| 4' | Male inflorescences 5-20 mm long pedunculate. |
