| 1 | Leaves spirally arranged or partly (sub)opposite, sometimes subverticillate |
| 1' | Leaves distichous |
| 2 | Stipules (1-)1.5-4.5(-5) cm long |
| 2' | Stipules up to 1(-1.2) cm long |
| 3 | Leafy twigs (sparsely) whitish hispidulous, (densely) whitish puberulous or hirtellous, or glabrous; stipules caducous (or only persistent in tufts at the apices of twigs) |
| 3' | Leafy twigs at least partly (dark) brown hirsute to hirtellous or strigose to strigillose; stipules mostly (sub)persistent |
| 4 | Epidermis of the petiole persistent; fig receptacle longer than wide, 2-2.5 cm diam. when dry |
| 4' | Epidermis of the petiole flaking off over the whole length or only at the basal and upper part; fig receptacle about as long as wide, or if longer than wide, then up to 2 cm diam. when dry |
| 5 | Lateral veins (4-)6-10 pairs; petiole 1.5-3 mm thick, its epidermis flaking off at the basal and upper part |
| 5' | Lateral veins (8-)10-12 pairs; petiole (2-)3-5 mm thick, its epidermis flaking off over the whole length |
| 6 | Lateral bracts of the fig receptacle 5-20 mm long, often numerous and largely or entirely concealing the receptacle |
| 6' | Lateral bracts of the fig receptacle to 5 mm long, several, few, or none |
| 7 | Petiole (1.5-)4-15(-20) cm long; base of the lamina (sub)cordate |
| 7' | Petiole 1-5.5 cm long; base of the lamina rounded |
| 8 | Basal lateral veins up to 1/4-1/3 the length of the lamina; fig receptacle 0.7-1.5 cm diam. when dry |
| 8' | Basal lateral veins up to 1/3-1/2(-2/3) the length of the lamina; fig receptacle (1-)1.5-2(-3) cm diam. when dry |
| 9 | Leafy twigs and lower surface of the lamina (at least partly) with (dark) brown hairs |
| 9' | Leafy twigs and lamina beneath with whitish hairs or indumentum absent |
| 10 | Epidermis of the petiole persistent |
| 10' | Epidermis of the petiole flaking off |
| 11 | Waxy glands on the lamina absent; figs cauliflorous to flagelliflorous on leafy branches on the trunk or on up to 3 m long stolons |
| 11' | Waxy glands on the lamina present, conspicuous, largely on the midrib; figs axillary to cauliflorous |
| 12 | Basal lateral veins up to 1/3-1/2 the length of the lamina; fig receptacle 1.3-1.8 cm diam. when dry, with numerous up to 15 mm long lateral bracts |
| 12' | Basal lateral veins up to 1/8-1/3 the length of the lamina; fig receptacle 0.4-0.8 (-1.2) cm diam. when dry, with few up to 3 mm long lateral bracts |
| 13 | Waxy glands on the lamina absent; basal lateral veins up to 1/8-1/6 the length of the lamina and unbranched |
| 13' | Waxy glands on the lamina present, conspicuous, largely on the midrib; basal lateral veins up to 1/4(-1/3) the length of the lamina and mostly branched |
| 14 | Leafy twigs and laminas glabrous and (almost) smooth |
| 14' | Leafy twigs and laminas (densely or sparsely) hairy and/or scabrous to scabridulous |
| 15 | Stipules 0.5-1 cm long, almost subulate, stiff, often subpersistent in tufts at the shoot apices; fig receptacle usually with (few) lateral bracts |
| 15' | Stipules 0.3-0.4 cm long, not almost subulate, stiff, and subpersistent; fig receptacle without lateral bracts |
| 16 | Epidermis of the petiole flaking off over the whole length or only at the basal part or also at the upper part |
| 16' | Epidermis of the petiole persistent |
| 17 | Waxy glands on the midrib and nearly fused |
| 17' | Waxy glands in the axils of the basal lateral veins |
| 18 | Stipules usually 1-2 cm long, base of the lamina usually (sub)cordate, petioles mostly longer than 4 cm |
| 18' | Stipules usually 0.5-1 cm long, base of the lamina cuneate to rounded; petioles mostly up to 2.5 cm long |
| 19 | Waxy glands on or largely on the midrib; base of the lamina mostly cordate to subcordate |
| 19' | Waxy glands confined to the axils of the basal lateral veins; base of the lamina cuneate to rounded |
| 20 | Fig receptacle longer than wide, 2-2.5 cm diam. when dry |
| 20' | Fig receptacle subglobose, 0.3-1.2 cm diam. when dry |
| 21 | Stipules 0.5-1 cm long, almost subulate, stiff, often subpersistent in tufts at the shoot apices; fig receptacle usually with (few) lateral bracts |
| 21' | Stipules 0.3-0.5(-0.8) cm long, not almost subulate, stiff, and subpersistent; fig receptacle usually without lateral bracts |
| 22 | Stipules fully amplexicaul, leaving annular scars (or only some of them semi-amplexicaul) |
| 22' | Stipules semi-amplexicaul to lateral, the scars not meeting opposite the base of the petiole |
| 23 | Stipules (0.5-)1-2.8 cm long |
| 23' | Stipules 0.2-1(-1.3) cm long |
| 24 | Leafy twigs, petioles and/or stipules hairy, often sparsely and/or minutely so |
| 24' | Leafy twigs, petioles, and stipules entirely glabrous |
| 25 | Stipules dark brown when dry; base of the lamina ± distinctly inequilateral and one side ± clearly decurrent and often slightly to clearly (minutely) auricled; often additional waxy glands in the axils of the 2nd to 4th pairs of lateral veins or the single waxy gland in such positions and not in the axils of the basal lateral veins |
| 25' | Stipules greenish to pale brown when dry; base of the lamina hardly unilaterally decurrent and the waxy glands, 1 or 2, in the axils of the basal lateral veins |
| 26 | Stipules dark brown when dry, base of the lamina ± distinctly inequilateral and one side ± clearly decurrent and often slightly to clearly (minutely) auricled; often additional waxy glands in the axils of the 2nd to 4th pairs of lateral veins or the single waxy gland in such positions and not in the axils of the basal lateral veins |
| 26' | Stipules greenish to pale brown when dry; base of the lamina hardly unilaterally decurrent and the waxy glands, 1 or 2, in the axils of the basal lateral veins |
| 27 | Basal lateral veins usually up to 1/4-1/2 the length of the lamina |
| 27' | Basal lateral veins usually up to 1/10-1/4 the length of the lamina |
| 28 | Epidermis of petiole flaking off |
| 28' | Epidermis of petiole persistent |
| 29 | Basal lateral veins running ± remotely from the margin of the lamina, branched; apex of the lamina shortly acuminate to rounded |
| 29' | Basal lateral veins running close to the margin of the lamina, unbranched; apex of the lamina acuminate to caudate |
| 30 | Lamina scabrous above |
| 30' | Lamina smooth above |
| 31 | Figs flagelliferous, fig receptacle 0.2-0.3 cm diam. when dry |
| 31' | Figs axillary or just below the leaves, sometimes ramiflorous; fig receptacle 0.3-1.5 cm diam. when dry |
| 32 | Lamina with cystoliths (visible as minute pustules) only beneath; basal lateral veins 1/10-1/8 the length of the lamina; lamina and stipules drying brownish |
| 32' | Lamina with cystoliths (visible as minute pustules) on both sides; basal lateral veins up to 1/8-1/4 the length of the lamina; lamina and stipules drying greenish |
| 33 | Leafy twigs and petioles entirely glabrous; epidermis of the petioles of the youngest leaves usually not yet flaking off |
| 33' | Leafy twigs and petioles minutely and sparsely hairy; epidermis of the petioles of the youngest leaves already flaking off |
| 34 | Lamina strongly asymmetric and the lobe of the broad side of the lamina base often covering the petiole; 2 waxy glands in the axils of the basal lateral veins at the broad side of the lamina (or these glands extended to the midrib and then often fused) and only 1 in the axil of the main basal lateral veins at the narrow side; additional smaller waxy glands in the axils of other lateral veins present or not |
| 34' | Lamina symmetric or ± strongly asymmetric, but then not a lobe of the lamina base covering the petiole, with 2 glands (one in each of the axils of (the major) basal lateral veins), 1 gland in the axil of one of (the major) basal lateral veins, or also additional glands in the axils of other lateral veins |
| 35 | Stipules usually 1-2.3 cm long and subpersistent; decurrent base of the lamina extended by a to 1.5 cm long lobe |
| 35' | Stipules usually up to 1 cm long and/or caducous; base of the lamina different |
| 36 | Epidermis of the petiole flaking off |
| 36' | Epidermis of the petiole persistent |
| 37 | Lamina glabrous and/or (almost) smooth above |
| 37' | Lamina ± scabrous above |
| 38 | Leafy twig and petiole entirely glabrous or the petiole hairy only at the margins of the adaxial groove |
| 38' | Leafy twig and petiole hairy, often minutely and inconspicuously |
| 39 | Basal lateral veins up to 1/3-1/2 the length of the lamina |
| 39' | Basal lateral veins up to 1/6-1/3 the length of the lamina |
| 40 | Basal lateral veins unbranched |
| 40' | Basal lateral veins branched at least at the broad side of the lamina |
| 41 | Peduncle 0.4-0.5 cm long; base of the lamina rounded to subcordate; petiole hairy at the margins of the adaxial groove; basal lateral veins distinctly branched |
| 41' | Peduncle 0.5-1.2 cm long; petiole entirely glabrous; base of the lamina usually cuneate to obtuse; basal lateral veins unbranched or faintly branched |
| 42 | Lamina mostly 4-10 cm long; basal lateral veins running close to the margin of the lamina, unbranched; fig receptacle hispidulous, scabrous to scabridulous |
| 42' | Lamina mostly 10-22 cm long; basal lateral veins, at least at the broad side of the lamina often branched; fig receptacle glabrous and smooth |
| 43 | Waxy gland at the base of the midrib |
| 43' | Waxy glands in the axils of lateral veins, only the basal ones or also others |
| 44 | Basal lateral veins of the lamina unbranched or faintly branched; figs axillary |
| 44' | Basal lateral veins at the broad side of the lamina branched; figs often also (far) below the leaves |
| 45 | Basal lateral veins up to 1/6-1/4 the length of the lamina |
| 45' | Basal lateral veins up to 1/4-1/2 the length of the lamina |
| 46 | Lamina with cystoliths (visible as minute pustules) only beneath; base of the lamina at one side decurrent and auricled; petiole 0.2-0.6(-0.8) cm long; plants often lianescent and/or epiphytic |
| 46' | Lamina with cystoliths (visible as minute pustules) on both sides; base of the lamina not decurrent or auricled; petiole 0.5-1.5(-2) cm long; plants always terrestrial trees |
| 47 | Lamina with the smaller veins prominent beneath, the upper surface often ± bullate; fig receptacle 0.5-0.8 cm diam. when dry, scabrous |
| 47' | Lamina with the smaller veins almost flat beneath, the upper surface not bullate; fig receptacle 0.9-1.2 cm diam. when dry, smooth |
| 48 | Tertiary and smaller veins prominent beneath; indumentum on the leafy twigs and lamina beneath usually dense and conspicuous |
| 48' | Tertiary and smaller veins flat or only slightly prominent beneath; indumentum of the leafy twigs and lamina beneath sparse and/or inconspicuous |
| 49 | Waxy glands also in the axils of other lateral veins than the basal ones |
| 49' | Waxy glands only in the axils of the basal lateral veins |
| 50 | Petiole 0.2-1 cm long; base of the lamina slightly inequilateral and the lateral veins unbranched or faintly branched |
| 50' | Petiole (0.7-)1-1.5(-2) cm long and/or the base of the lamina usually distinctly inequilateral and the basal lateral veins at least at the broad side of the lamina distinctly branched |
| 51 | Upper surface of the lamina glabrous; figs also ramiflorous and cauliflorous |
| 51' | Upper surface of the lamina (sparsely) hispidulous; figs usually only axillary |
