| 1 | Ostiole tri-radiate |
| 1' | Ostiole circular |
| 2 | Stipules connate, 6-25 cm long |
| 2' | Stipules free, usually less than 6 cm long, on opening shoots, in some species up to 8 cm long |
| 3 | Internodes conspicuously different in length, the proximal ones of a season’s growth long, subsequently shorter, the ultimate ones very short, sometimes with persistent stipules forming terminal buds |
| 3' | Internodes not conspicuously different in length |
| 4 | Apex of the lamina caudate |
| 4' | Apex of the lamina acuminate, mostly shortly so |
| 5 | Major basal lateral veins up to 1/3-1/2 the length of the lamina; cystoliths on both sides of the lamina (in dried material visible as minute pustules); ovary white |
| 5' | Major basal lateral veins 1/10-1/3 the length of the lamina; cystoliths (usually) only beneath; ovaries red(-brown) |
| 6 | Lateral veins 4-7 pairs; margin of upper ostiolar bracts ciliolate |
| 6' | Lateral veins 7-16 pairs; upper ostiolar bracts glabrous (or sparsely puberulous out- side) |
| 7 | Epidermis of the petiole (usually) flaking off, at least at the uppermost and/or basal part; peduncle 0.1-0.5 cm long |
| 7' | Epidermis of the petiole persistent; peduncle 0.7-1.5 cm long or at most 0.1 cm long |
| 8 | Stipules at the apices of leafy twigs subpersistent and forming ovoid buds (the scars of the stipules concentrated at the base of the new season’s growth); peduncle 0.7-1.5 cm long; basal bracts caducous |
| 8' | Stipules not forming distinct terminal buds; figs sessile or up to 0.1 cm long pedunculate; basal bracts persistent |
| 9 | Figs pedunculate |
| 9' | Figs sessile |
| 10 | Lamina glabrous beneath |
| 10' | Lamina hairy on the midrib beneath |
| 11 | Tertiary venation parallel to the lateral veins (such as in F. elastica); lateral veins departing in wide angles (towards 90°) |
| 11' | Tertiary venation partly to largely parallel to the lateral veins to reticulate towards the margin or reticulate to subscalariform towards the margin; lateral veins usually departing in more acute angles (about 60°) |
| 12 | Fig receptacle longer than wide |
| 12' | Fig receptacle about as long as wide |
| 13 | Lamina hairy |
| 13' | Lamina glabrous |
| 14 | Basal bracts 2-3 mm long |
| 14' | Basal bracts 4-8(-10) mm long |
