| 1 | Tepals 12. Carpels free (not seen in E. platyphylla). |
| 1' | Tepals (12-) 17. Carpels free or concrescent. For New Guinea plants with 12 tepals and fruiting carpels free, see under E. tsiampacca. |
| 2 | Twigs and stipules hairy |
| 2' | Twigs and stipules glabrous |
| 3 | Undersurface of leaves glaucous (sometimes a dense indumentum of appressed hairs obscuring the glaucousness), hairy (in New Guinea sometimes glabrous: var. glaberrima). Fruiting carpels free, dorsally dehiscing |
| 3' | Undersurface of leaves not glaucous, glabrous or hairy. Fruiting carpels concrescent. |
| 4 | Twigs glabrous or yellowish villous, soon glabrescent, rarely pubescent. Nerves in (10—)14—21 pairs |
| 4' | Twigs densely fulvously pubescent or tomentose, later glabrescent. Nerves in 20-24 pairs |
