| 1 | Ostiole tri-radiate or slit-shaped, the upper ostiolar bracts descending |
| 1' | Ostiole circular, the upper ostiolar bracts horizontal |
| 2 | Ostiole slit-shaped |
| 2' | Ostiole tri-radiate |
| 3 | Lateral veins 9-14 pairs; apex of the peduncle ± dilated; fig receptacle 0.4-1 cm diam. when dry |
| 3' | Lateral veins (12-)15-25(-30) pairs; apex of the peduncle extended into a cupule |
| 4 | Stipules 4-20 cm long; fig receptacle 1-4 cm diam. when dry, mostly ellipsoid |
| 4' | Stipules 1-3 cm long; fig receptacle 0.3-1.2 cm diam. when dry, subglobose |
| 5 | Stipules connate, 6-25 cm long |
| 5' | Stipules free, usually less than 6 cm long, on opening shoots, in some species up to 8 cm long |
| 6 | 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 |
| 6' | Internodes not conspicuously different in length |
| 7 | Apex of the lamina caudate |
| 7' | Apex of the lamina acuminate, mostly shortly so |
| 8 | Lateral veins 4-7 pairs; margin of upper ostiolar bracts ciliolate |
| 8' | Lateral veins 7-16 pairs; upper ostiolar bracts glabrous |
| 9 | Epidermis of petiole flaking off, at the uppermost or also at the basal part |
| 9' | Epidermis of petiole persistent |
| 10 | 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 |
| 10' | Basal lateral veins up to 1/10-1/5 the length of the lamina, their bases not running parallel to the midrib |
| 11 | Figs pedunculate or sessile with a peduncle-like stipe |
| 11' | Figs sessile |
| 12 | Figs sessile with a peduncle-like stipe (the basal bracts at the base of the stipe) |
| 12' | Figs pedunculate (the basal bracts at the apex of the peduncle) |
| 13 | Fig receptacle 1.3-2 cm diam. when dry |
| 13' | Fig receptacle 0.4-1 cm diam. when dry |
| 14 | Tertiary venation parallel to the lateral veins (such as in F. elastica); lateral veins departing in wide angles (towards 90°) |
| 14' | 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°) |
| 15 | Fig receptacle ellipsoid, ovoid, or cylindrical; petioles and stipules usually 1.5-3 cm long |
| 15' | Figs receptacle subglobose, or if distinctly longer than wide, then the petioles and/or stipules usually up to 1.5 cm long |
| 16 | Fig receptacle usually 1-1.8 cm diam. when dry; basal bracts 3-8(-10) mm long |
| 16' | Fig receptacle 0.5-1 cm diam. when dry, or if more than 1 cm diam., then the basal bracts 0.5-3 mm long |
| 17 | Stipules 1.5-2.5 cm long; basal bracts mostly ± connate |
| 17' | Stipules usually 0.5-1.5 cm long; basal bracts free |
| 18 | Fig receptacle longer than wide |
| 18' | Fig receptacle about as long as wide |
| 19 | Basal bracts 0.5-3 mm long; stipules usually 1-1.5 cm long |
| 19' | Basal bracts 5-15(-18) mm long; stipules usually 2-4 cm long |
| 20 | Lamina on the midrib above and the midrib and lateral veins beneath white puberulous; base of the lamina cordate to rounded |
| 20' | Lamina above and beneath glabrous or sometimes minutely puberulous on the midrib beneath; base of the lamina cuneate to rounded |
| 21 | Basal bracts 5-15(-18) mm long; stipules usually 2-4 cm long |
| 21' | Basal bracts 2-3 mm long; stipules 0.5-1.5 cm long |
| 22 | Fig receptacle with internal hairs; stipules usually 0.5-1 cm long |
| 22' | Fig receptacle without internal hairs; stipules 1-1.5 m long |
| 23 | Peduncle up to 0.5 cm long; lateral veins (3-)4-8(-10) pairs |
| 23' | Peduncle 0.7-1.2 cm long; lateral veins (8-)10-14 pairs |
