| 1 | Ostiole 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 | Lateral veins 4-7 pairs; margin of upper ostiolar bracts ciliolate |
| 6' | Lateral veins 7-16 pairs; upper ostiolar bracts glabrous |
| 7 | Epidermis of petiole flaking off, at the uppermost or also at the basal part |
| 7' | Epidermis of petiole persistent |
| 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 subglobose, the basal bracts c. 3 mm long |
| 11' | Fig receptacle usually ellipsoid to ovoid, rarely subglobose, the basal bracts 3-11 mm long |
| 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 | Stipules 1.5-2.5 cm long; ostiole closed; basal bracts mostly ± connate |
| 14' | Stipules usually 0.5-1.5 cm long; ostiole ± open; basal bracts free |
| 15 | Lamina mostly up to 10 cm, rarely up to 15 cm long |
| 15' | Lamina mostly longer than 10 cm, up to c. 20 or up to c. 30 cm |
| 16 | Basal bracts 2-3 mm long; fig receptacle with internal hairs |
| 16' | Basal bracts 3-8(-10) mm long; fig receptacle without internal hairs |
| 17 | Apex of lamina rounded to short-acuminate, the acumen obtuse, ostiole mostly open, the 3 upper ostiolar bracts not or partly imbricate |
| 17' | Apex of lamina acuminate, the acumen usually acute; ostiole closed, the 3 upper ostiolar bracts clearly imbricate |
| 18 | Fig receptacle longer than wide |
| 18' | Fig receptacle about as long as wide (or wider than high) |
| 19 | Fig receptacle 2-3 cm diam. when dry |
| 19' | Fig receptacle 0.3-2 cm diam. when dry |
| 20 | Stipules (1.5-)2-4 cm long; basal lateral veins unbranched, usually without smaller lateral veins below the (main) ones; base of the lamina rounded to cuneate (rarely subcordate) |
| 20' | Stipules 1-1.5(-2) cm long; (main) basal lateral veins often branched, often 1-3 pairs of smaller lateral veins below the main ones; base of the lamina cordate to rounded |
| 21 | Stipules brownish (woolly) tomentose to subvillous or glabrous; fig receptacle glabrous inside |
| 21' | Stipules sparsely to densely yellowish sericeous; fig receptacle hairy inside, on the inner surface or also on the pedicels |
| 22 | Fig receptacle 1-2 cm diam. when dry |
| 22' | Fig receptacle 0.3-1 cm diam. when dry |
| 23 | Basal bracts 0.5-3 mm long |
| 23' | Basal bracts 3-12 mm long |
| 24 | Stipules 1-1.5(-2) cm long; base of the lamina cordate to rounded |
| 24' | Stipules 2-4 cm long; base of the lamina rounded or to subattenuate |
| 25 | Midrib (and lateral veins) ± impressed above; stipules brownish to whitish sericeous to puberulous; base of lamina mostly (sub)cordate with a narrow sinus |
| 25' | Midrib (and lateral veins) slightly prominent to flat or the midrib sometimes slightly impressed; stipules glabrous or white (minutely) puberulous; base of lamina mostly cuneate to rounded |
| 26 | Ostiole closed, the 3 upper ostiolar bracts clearly imbricate; areoles of lamina usually distinct beneath because of prominent veinlets |
| 26' | Ostiole mostly open, the 3 upper ostiolar bracts not or partly imbricate; areoles and often also the tertiary of venation of lamina obscure beneath |
| 27 | Fig receptacle 1-2 cm diam. when dry |
| 27' | Fig receptacle 0.3-1 cm diam. when dry |
| 28 | Lamina on the midrib above and the midrib and lateral veins beneath white puberulous; base of the lamina cordate to rounded |
| 28' | Lamina above and beneath glabrous or sometimes minutely puberulous on the midrib beneath; base of the lamina cuneate to rounded |
| 29 | Base of the lamina and the lower part of the margin not (or hardly) callose; smaller veins of the lamina, even the reticulum ± clearly visible beneath; basal bracts usually covering 1/2 or more of the fig receptacle |
| 29' | Base of the lamina and (at least) the lower part of the margin ± distinctly callose; smaller veins of the lamina usually not clearly visible to obscure; basal bracts covering up to 1/2 of the fig receptacle |
