1	"Leaf rachis winged"	2
1	"Leaf rachis not winged"	4
2	"Leaf rachis winged only towards apex; inflorescence pendulous, 18–70 cm long"	"Harpullia rhyticarpa"
2	"Leaf rachis winged throughout or to near base; inflorescence erect or spreading, 5–14 cm long"	3
3	"Margins of leaflets and rachis wing dentate or serrate; wing narrowing towards base; petals 10–12 mm long; stamens 8; SE Qld"	"Harpullia alata"
3	"Margins of leaflets and rachis wing entire; wing broad to base, auriculate; petals 15–20 mm long; stamens 5 or 6; NE Qld"	"Harpullia frutescens"
4	"Leaf rachis and petiolules pubescent with simple ascending hairs 0.2–0.5 mm long and stellate hairs 0.3-0.7 mm diameter"	"Harpullia arborea"
4	"Leaf rachis and petiolules glabrous or sparely puberulent with simple appressed hairs 0.05–0.15 mm long and stellate hairs 0.15–0.25 mm diameter"	5
5	"Leaf rachis 22–28 cm long; inflorescence ramiflorus"	"Harpullia ramiflora"
5	"Leaf rachis 1.5–19 cm long; inflorescence axillary or terminal"	6
6	"Leaf rachis 11–19 cm long; inflorescence a pendulous raceme 18–70 cm long; leaflets acute, acuminate or caudate at apex, glossy above and below"	"Harpullia rhyticarpa"
6	"Leaf rachis 1.5–12 cm long; inflorescence an erect or spreading panicle, 5–30 cm long; leaflets obtuse, retuse or acute, dull or shiny below"	7
7	"Capsule slightly woody, smooth, pubescent or puberulent outside, valves woolly inside; arils covering half to 2/3 of seeds; leaflets obtuse or retuse at apex; petals not clawed, glabrous, 9–12 mm long; stamens 5"	"Harpullia hillii"
7	"Capsule papery, reticulate, glabrescent or glabrous outside, valves glabrous inside; arils rudimentary at base or absent; leaflets acute or acuminate; petals clawed, pubescent inside, 6–8 mm long; stamens 8"	"Harpullia pendula"