| 1 | Stipules connate, 6-25 cm long |
| 1' | Stipules free, usually less than 6 cm long, on opening shoots, in some species up to 8 cm long |
| 2 | 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 |
| 2' | Internodes not conspicuously different in length |
| 3 | Apex of the lamina caudate |
| 3' | Apex of the lamina acuminate, mostly shortly so |
| 4 | 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 |
| 4' | Major basal lateral veins 1/10-1/3 the length of the lamina; cystoliths (usually) only beneath; ovaries red(-brown) |
| 5 | Lateral veins 4-7 pairs; margin of upper ostiolar bracts ciliolate |
| 5' | Lateral veins 7-16 pairs; upper ostiolar bracts glabrous (or sparsely puberulous outside) |
| 6 | Epidermis of the petiole (usually) flaking off, at least at the uppermost and/or basal part; peduncle 0.1-0.5 cm long |
| 6' | Epidermis of the petiole persistent; peduncle 0.7-1.5 cm long or at most 0.1 cm long |
| 7 | 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 |
| 7' | Stipules not forming distinct terminal buds; figs sessile or up to 0.1 cm long pedunculate; basal bracts persistent |
| 8 | Figs pedunculate or sessile with a peduncle-like stipe |
| 8' | Figs sessile |
| 9 | Apex of the peduncle widened into a rim (bearing the basal bracts inside) |
| 9' | Apex of the peduncle not widened into a rim |
| 10 | Midrib of the lamina beneath laterally hairy, often with hairs concentrated in the axils of the lateral veins |
| 10' | Midrib of the lamina beneath with hairs evenly distributed or absent |
| 11 | Basal bracts (early) caducous; fig receptacle subglobose, 0.5-0.7 cm diam. when dry |
| 11' | Basal bracts persistent; fig receptacle ellipsoid to subglobose, 0.8-1.2 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 usually 1-1.8 cm diam. when dry; basal bracts 3-8(-10) mm long |
| 14' | 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 |
| 15 | Midrib (at least in the lower part) of the lamina slightly prominent; petiole, stipules and fig receptacle when dry usually blackish |
| 15' | Midrib (at least in the lower part) of the lamina slightly impressed; petiole, stipules and fig receptacle when dry usually pale yellowish |
| 16 | Lamina mostly up to 10 cm, rarely up to 15 cm long |
| 16' | Lamina mostly longer than 10 cm, up to c. 20 or up to c. 30 cm |
| 17 | Fig receptacle longer than wide (ellipsoid, obovoid, or ovoid) |
| 17' | Fig receptacle about as long as broad (subglobose) |
| 18 | Lamina acuminate, the acumen acute |
| 18' | Lamina short-acuminate to rounded, the acumen usually obtuse |
| 19 | Ostiole closed, the 3 upper ostiolar bracts clearly imbricate |
| 19' | Ostiole ± open, the 3 upper ostiolar bracts not or partly imbricate |
| 20 | Lamina acuminate (to subcaudate); basal lateral veins unbranched |
| 20' | Lamina short-acuminate to rounded (to retuse); basal lateral veins branched |
| 21 | Lateral veins (3-)4-6 pairs, the basal pair distinctly branched; stipules mostly 0.5-1 cm long |
| 21' | Lateral veins 6-10 pairs, the basal pair unbranched (or faintly branched); stipules usually 1-2 cm long |
| 22 | Basal lateral veins branched; basal bracts 3-5 mm long |
| 22' | Basal lateral veins unbranched; basal bracts 1-3 mm long |
| 23 | Lamina acuminate; basal bracts 1-2 mm long |
| 23' | Lamina rounded to short-acuminate; basal bracts 2-8(-10) mm long |
| 24 | Basal bracts 4-8(-10) mm long; stipules usually 1-2 cm long |
| 24' | Basal bracts 2-3 mm long; stipules usually 0.5-1 cm long |
| 25 | Fig receptacle longer than wide |
| 25' | Fig receptacle about as long as wide (or wider than high) |
| 26 | Fig receptacle 2-3 cm diam. when dry |
| 26' | Fig receptacle 0.5-2 cm diam. when dry |
| 27 | Basal bracts 10-20(-30) mm long; tertiary venation of the lamina (sub)scalariform |
| 27' | Basal bracts 0.5-10 mm long; tertiary venation reticulate to subscalariform or partly parallel to the lateral veins (towards the midrib) |
| 28 | Stipules (1.5-)2-4 cm long; basal lateral veins unbranched, usually without smaller lateral veins below the (main) ones |
| 28' | 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 |
| 29 | Fig receptacle 1-2 cm diam. when dry |
| 29' | Fig receptacle 0.5-1 cm diam. when dry |
| 30 | Basal bracts 3-15(-18) mm long |
| 30' | Basal bracts 0.5-3 mm long |
| 31 | Basal bracts covering up to 1/3(-1/2) of the receptacle |
| 31' | Basal bracts covering 1/2-3/4 of the receptacle |
| 32 | Stipules 1-1.5(-2) cm long; base of the lamina cordate to rounded |
| 32' | Stipules 2-4 cm long; base of the lamina rounded or to subattenuate |
| 33 | Ostiole closed, the 3 upper ostiolar bracts clearly imbricate |
| 33' | Ostiole ± open, the 3 upper ostiolar bracts not or partly imbricate |
| 34 | Basal lateral veins branched; lateral veins (3-)4-6 pairs |
| 34' | Basal lateral veins (usually) unbranched; lateral veins 6-12 pairs |
| 35 | Fig receptacle 1-2 cm diam. when dry |
| 35' | Fig receptacle 0.3-1(-1.1) cm diam. when dry |
| 36 | Indumentum on various parts (as leafy twigs and midrib of the lamina beneath) brown floccose-tomentose |
| 36' | Indumentum not floccose-tomentose |
| 37 | Lamina on the midrib above and the midrib and lateral veins beneath white puberulous; base of the lamina cordate to rounded |
| 37' | Lamina above and beneath glabrous or sometimes minutely puberulous on the midrib beneath; base of the lamina cuneate to rounded |
| 38 | Apex of the lamina acuminate, the acumen usually acute; basal bracts ovate, not or only imbricate at the base |
| 38' | Apex of the lamina rounded to obtuse, or if acuminate, then the acumen obtuse; basal bracts semicircular to broadly ovate, ± imbricate |
| 39 | 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 |
| 39' | 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 |
| 40 | Basal bracts 0.5-2 mm long |
| 40' | Basal bracts 3-8(-10) mm long |
| 41 | Basal lateral veins ± distinct, 1/10-1/4 the length of the lamina; ostiole ± open, the 3 upper ostiolar bracts not or partly imbricate |
| 41' | Basal lateral veins not distinct, 1/20-1/10 the length of the lamina; petiole 1-2.5(-3) cm long; ostiole closed, the 3 upper ostiolar bracts clearly imbricate |
| 42 | Indumentum on various parts (as stipules and midrib of the lamina beneath) brown floccose-tomentose |
| 42' | Indumentum not floccose-tomentose |
| 43 | Leafy twigs (and often also on other parts) with abundant small dark brown appressed hairs; tertiary venation ± prominent beneath |
| 43' | Leafy twigs without such hairs or if present, then very sparse and inconspicuous; tertiary venation (almost) flat beneath |
| 44 | Ostiole ± open, the 3 upper ostiolar bracts not or partly imbricate |
| 44' | Ostiole closed, the 3 upper ostiolar bracts clearly imbricate |
| 45 | Basal lateral veins up to 1/10-1/4 the length of the lamina; basal bracts 1-2 mm long |
| 45' | Basal lateral veins up to 1/4-1/2 the length of the lamina; basal bracts 3-8(-10) mm long |
| 46 | Lateral veins of the lamina 6-10 pairs; basal lateral veins unbranched, sometimes faintly branched |
| 46' | Lateral veins of the lamina (3-)4-6 pairs; basal lateral veins branched |
| 47 | Base of the lamina auriculate to cordulate; fig receptacle depressed-globose |
| 47' | Base of the lamina cuneate to rounded; fig receptacle subglobose to ovoid to ellipsoid to obovoid |
