| 1 | Ostiole tri-radiate (to almost slit-shaped), the upper ostiolar bracts descending |
| 1' | Ostiole circular, the upper ostiolar bracts horizontal |
| 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; ovary red(-brown) |
| 6 | Epidermis of petiole flaking off, at the uppermost or also at the basal part |
| 6' | Epidermis of petiole persistent |
| 7 | Basal bracts persistent; fig receptacle 0.3-0.5(-0.7) cm diam. when dry |
| 7' | Basal bracts caducous; fig receptacle 0.7-1.2 cm in diam. when dry |
| 8 | Peduncle 0.7-1.5 cm long; basal bracts caducous |
| 8' | Peduncle 0-0.2 cm long; basal bracts persistent |
| 9 | Basal lateral veins up to 1/5-1/3 the length of the lamina, mostly departing from the midrib at different distances from the base, their bases running parallel to the midrib |
| 9' | Basal lateral veins up to 1/10-1/5 the length of the lamina, their bases not running parallel to the midrib |
| 10 | Figs pedunculate |
| 10' | Figs sessile |
| 11 | Fig receptacle 0.4-0.7(-1) cm diam. when dry |
| 11' | Fig receptacle 1.2-3.5 cm diam. when dry |
| 12 | Tertiary venation parallel to the lateral veins (such as in F. elastica); lateral veins departing in wide angles (towards 90°) |
| 12' | 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°) |
| 13 | Fig receptacle ellipsoid, ovoid, or cylindrical; petioles and stipules usually 1.5-3 cm long |
| 13' | Fig receptacle subglobose, or if distinctly longer than wide, then the petioles and/or stipules usually up to 1.5 cm long |
| 14 | Fig receptacle longer than wide |
| 14' | Fig receptacle about as long as broad |
| 15 | Basal bracts 0.5-3 mm long; ostiole open, the upper 3 ostiolar bracts not or partly imbricate; stipules usually 1-1.5 cm long |
| 15' | Basal bracts 4-15(-18) mm long; ostiole closed, the 3 upper ostiolar bracts clearly imbricate; stipules usually longer than 1.5 cm |
| 16 | Apex of lamina acuminate, the acumen usually acute; areoles of lamina obscure beneath |
| 16' | Apex of lamina short-acuminate, the acumen usually obtuse; areoles of lamina usually distinct beneath because of prominent veinlets |
| 17 | Basal bracts 2-3 mm long; fig receptacle 0.5-0.8(-1) cm diam. when dry; lamina usually up to 10 cm long |
| 17' | Basal bracts 5-15 mm long; fig receptacle (0.8-)1-2 cm diam. when dry; lamina usually longer than 10 cm |
| 18 | Lamina on the midrib above and the midrib and lateral veins beneath white puberulous; base of the lamina cordate to rounded |
| 18' | Lamina above and beneath glabrous or sometimes minutely puberulous on the midrib beneath; base of the lamina cuneate to rounded |
| 19 | Basal bracts semicircular to suborbicular with a rounded apex, imbricate, covering 1/3-2/3 of the receptacle; areoles of lamina usually distinct beneath because of prominent veinlets |
| 19' | Basal bracts (broadly) ovate, not (or only basally) imbricate, the apex obtuse to acute (or rounded), covering up to 1/3 (or 1/2) of the receptacle; areoles of lamina obscure beneath |
