1	"Capsule pubescent"	"Dipteracanthus prostratus"
1	"Capsule glabrous"	2
2	"Internode faces glabrous or very sparsely hairy, with the grooves pubescent"	"Dipteracanthus chichesterensis"
2	"Internode faces pubescent, or if sparsely hairy, then the grooves not pubescent"	3
3	"Abaxial leaf surface pubescent with short and long hairs (rarely absent), the hairs 0.3–1.5 mm long, either 2- or 3-celled and frequently bent with no preferred orientation, or 3–7-celled and spreading"	"Dipteracanthus australasicus subsp. australasicus"
3	"Abaxial leaf surface sparsely pubescent to pubescent, the hairs 0.2–0.3 mm long, 2- or 3-celled, bent to appressed and mostly retrorse or nearly so"	"Dipteracanthus subsp. corynothecus"