1 | Leaves usually mucronulate at apex, deciduous in the dry season. Branchlets usually with axillary spines and/or brachyblasts ending in thorns |
1' | Leaves not mucronulate at apex, persistent. Branchlets usually without, in 1. Olax p.p. sometimes with ramal thorns. |
2 | Climbing shrubs |
2' | Erect shrubs or trees. |
3 | Leaves subpeltate, 3-5-plinerved. Branches often with spring-like lignescent tendrils |
3' | Leaves not subpeltate, exclusively pinninerved. Tendrils absent |
4 | Leaves markedly distichous. |
4' | Leaves indistinctly or not distichous. |
5 | Spines or thorns sometimes present |
5' | Spines or thorns absent |
6 | Petiole conspicuously thickened distally |
6' | Petiole hardly or not thickened distally. |
7 | Leaves usually showing scattered blackish points on both faces; nerves slightly impressed above |
7' | Leaves without such blackish points; nerves not properly impressed above. |
8 | Leaves usually with numerous fine pellucid points visible against strong light |
8' | Leaves not pellucid-punctate |