| 1 | Leaves spirally arranged or partly (sub)opposite, sometimes subverticillate |
| 1' | Leaves distichous |
| 2 | Leafy twigs and lower surface of the lamina (at least partly) with (dark) brown hairs; waxy glands largely on the midrib |
| 2' | Leafy twigs and lamina beneath with whitish hairs; waxy glands not on the midrib |
| 3 | Petiole 2-9 cm long, varying considerably in length on the same twig; peduncle 1-5 cm long |
| 3' | Petiole 0.5-3 cm long, varying slightly to almost equal in length on the same twig; peduncle 0.2-1.5 cm long |
| 4 | Ostiole surrounded by apical bracts, these as well as the narrow outer ostiolar bracts pointing upwards; basal lateral veins mostly running at some distance from the margin and then branched |
| 4' | Ostiole not surrounded by apical bracts and outer ostiolar bracts not pointing upwards; basal lateral veins mostly running close to the margin and then unbranched (or in large leaves branched) |
| 5 | Stipules fully amplexicaul, leaving annular scars (or only some of them semi- amplexicaul) |
| 5' | Stipules semi-amplexicaul to lateral, the scars not meeting opposite the base of the petiole |
| 6 | Stipules (0.5-)1-2.8 cm long |
| 6' | Stipules 0.2-1(-1.3) cm long |
| 7 | Tertiary venation clearly scalariform |
| 7' | Tertiary venation reticulate to subscalariform |
| 8 | 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 |
| 8' | Stipules greenish to pale brown when dry; base of the lamina slightly or not unilaterally decurrent and the waxy glands, 1 (or 2), in the axils of the basal lateral veins |
| 9 | 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 |
| 9' | Stipules greenish to pale brown when dry; base of the lamina slightly or not unilaterally decurrent and the waxy glands, 1 (or 2), in the axils of the basal lateral veins |
| 10 | Leafy twigs and petioles entirely glabrous; epidermis of the petioles of the youngest leaves usually not yet flaking off |
| 10' | Leafy twigs and petioles minutely and sparsely hairy; epidermis of the petioles of the youngest leaves already flaking off |
| 11 | Epidermis of the petiole flaking off |
| 11' | Epidermis of the petiole persistent |
| 12 | Lamina with cystoliths (visible as minute pustules) only beneath; basal lateral veins mostly up to 1/3-1/2 the length of the lamina; lamina drying (dark) brown |
| 12' | Lamina with cystoliths (visible as minute pustules) on both sides; basal lateral veins up to 1/8-1/3 the length of the lamina; lamina drying greenish |
| 13 | Leafy twigs and petioles entirely glabrous; epidermis of the petioles of the youngest leaves usually not yet flaking off |
| 13' | Leafy twigs and petioles minutely and sparsely hairy; epidermis of the petioles of the youngest leaves already flaking off |
| 14 | 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 and only 1 in the axil of the main basal lateral veins at the narrow side |
| 14' | 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 |
| 15 | Basal lateral veins up to 1/2-2/3 the length of the lamina; tertiary venation largely perpendicular to the midrib |
| 15' | Basal lateral veins up to 1/10-1/2 the length of the lamina; not largely perpendicular to the midrib |
| 16 | Basal lateral veins up to 1/4 the length of the lamina; waxy glands in the axil of one of the lateral veins |
| 16' | Basal lateral veins up to 1/4-1/2 the length of the lamina; waxy glands in the axils of both lateral veins |
| 17 | Basal lateral veins running ± remotely from the margin of the lamina, branched; apex of the lamina shortly acuminate to rounded |
| 17' | Basal lateral veins running close to the margin of the lamina, unbranched; apex of the lamina acuminate to caudate |
| 18 | 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 |
| 18' | 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 |
| 19 | Leafy twigs and petioles coarsely hispidulous, scabrous, the hairs with strongly swollen bases |
| 19' | Leafy twigs and petioles puberulous to hirtellous or to subhispidulous, smooth (or scabridulous), the hairs without (strongly) swollen bases |
| 20 | Stipules 1-2.3 cm long |
| 20' | Stipules 0.3-1(-1.2) cm long |
| 21 | Epidermis of the petiole flaking off |
| 21' | Epidermis of the petiole persistent |
| 22 | Indumentum brown(ish); base of the lamina at the broad side extended by an elliptic lobe, or in smaller leaves just with a strip of mesophyll along the petiole; lateral veins usually 6-9 pairs |
| 22' | Indumentum whitish (often sparse and minute), base of the lamina not lobed, or if decurrent at one side, then the lateral veins usually 3-6 pairs |
| 23 | Midrib impressed above; base of the lamina equilateral, not decurrent |
| 23' | Midrib prominent above; base of the lamina inequilateral, at one side the base decurrent |
| 24 | Lamina glabrous and/or (almost) smooth above |
| 24' | Lamina ± scabrous above |
| 25 | Lamina with cystoliths (visible as minute pustules) only beneath; fig receptacle 0.2-0.4 cm diam. when dry, the peduncle 0-0.2 cm long |
| 25' | Lamina with cystoliths (visible as minute pustules) on both sides; fig receptacle 0.5-1(-1.5) cm diam. when dry, or if 0.3-0.5 cm diam. when dry, then the peduncle 0.2-1.2(-2.5) cm long |
| 26 | Peduncle 0.2-1(-2.5) cm long; waxy glands in ± slit-shaped extensions of the axils of the basal lateral veins |
| 26' | Peduncle 0-0.3 cm long; waxy glands not in extensions of the basal lateral veins |
| 27 | Waxy gland 1, in the axil of one of the basal lateral veins, or also additional ones in the axils of other lateral veins |
| 27' | Waxy glands 2, in the axils of both basal lateral veins |
| 28 | Ostiole surrounded by apical bracts, these as well as the narrow outer ostiolar bracts pointing upwards; basal lateral veins mostly running at some distance from the margin and then branched |
| 28' | Ostiole not surrounded by apical bracts and outer ostiolar bracts not pointing upwards; basal lateral veins running close to the margin and usually unbranched (or in large leaves branched) |
| 29 | Peduncle 0.2-1(-2.5) cm long; waxy glands in ± slit-shaped extensions of the axils of the basal lateral veins |
| 29' | Peduncle 0-0.3 cm long; waxy glands not in extensions of the basal lateral veins |
