1	"Stamens longer than the low corolla lips; upper surfaces of leaves bullate"	"Orthosiphon bullosus"
1	"Stamens shorter than the lower lips of the corollas; upper surfaces of leaves not bullate"	2
2	"Corolla tubes 0.8-1.2 times as long as the lower lips"	"Orthosiphon pallidus"
2	"Corolla tubes 1.5-3 times as long as the lower lips"	3
3	"Leaf blades shorter than 60 mm; plants herbs or subshrubs"	"Orthosiphon suffrutescens"
3	"Leaf blades often longer than 60 mm; plants herbs"	"Orthosiphon schimperi"