| 1 | Plants (usually/mostly/potentially) hemi-epiphytic |
| 1' | Plants root-climbers |
| 1'' | Plants (often) climbers otherwise |
| 1''' | Plants (obligatory/facultatively) rheophytic |
| 1'''' | Plants (facultatively) holo-epiphytic |
| 1''''' | Plants often becoming trees > 30 m |
| 1'''''' | Plants (always/mostly) shrubs < 1.5 m |
| 1''''''' | Plants (usually) ramiflorous |
| 1'''''''' | Plants (usually) cauliflorous |
| 1''''''''' | Plants (usually) flagelliflorous |
| 1'''''''''' | Plants monocaul or sparingly branched (pachycladous) with relatively large tufted leaves |
| 1''''''''''' | Plants (usually) deciduous |
| 1'''''''''''' | Plants showing intermittent growth often with Terminalia-branching (internodes of different length, distal tufts of leaves or persistent stipules) |
| 1''''''''''''' | Plants with uncinate hairs |
| 1'''''''''''''' | Plants without waxy glandular spots |
| 1''''''''''''''' | Plants often or always without waxy glands on the leaves and also absent on the leafy twigs or petioles |
| 1'''''''''''''''' | Plants with irritating hairs |
