1	"Leaflets mainly cuneate, widest at or near apex"	2
1	"Leaflets elliptic, ovate, obovate or oblanceolate, widest well below apex"	3
2	"Leaves 2–8(–10)-jugate, with pseudostipules. Leaflets spinose-dentate"	"Cupaniopsis shirleyana"
2	"Leaves 1–2(–3)-jugate, without pseudostipules. Leaflets apically with 2–4 obtuse teeth, rarely entire"	"Cupaniopsis wadsworthii"
3	"Young stem-apices glabrous"	"Cupaniopsis cooperorum"
3	"Young stem-apices pubescent"	4
4	"Young stem-apices villous or tomentose (noticeably hairy with dense indumentum cover)"	5
4	"Young stem-apices strigose (finely puberulent with scattered to sparse indumentum cover)"	9
5	"Sepals internally glabrous. Fruit capsules 15–20 × 22–28 mm, internally glabrous"	"Cupaniopsis tomentella"
5	"Sepals internally with appressed hairs, rarely glabrous. Fruit capsules 9–20 × 13–18 mm, internally villous"	6
6	"Margin of leaflets entire. Fruit pericarp 2.4 mm thick or more"	"Cupaniopsis diploglottoides"
6	"Margin of leaflets ± dentate to crenate. Fruit pericarp 0.5–1.8 mm thick"	7
7	"Teeth of leaflets hard. Inflorescences 1.5–6.5 cm long. Disc glabrous"	"Cupaniopsis serrata"
7	"Teeth of leaflets soft. Inflorescences (6.5–) 11–60 cm long. Disc with hairs in five tufts"	8
8	"Petiole 3.5–9 cm long; leaves 4–10-jugate. Anthers hairy"	"Cupaniopsis flagelliformis"
8	"Petiole 8–16 cm long; leaves (8–) 10–12-jugate. Anthers glabrous"	"Cupaniopsis newmanii"
9	"Leaflets crenate-dentate"	10
9	"Leaflets entire"	11
10	"Trees over 10 m high. Leaflets with dome-shaped to pocket-like domatia below. Fruit capsules 18–22 × 18–20 mm; seeds 17–18 × c. 9 mm (SE Qld, NE NSW)"	"Cupaniopsis baileyana"
10	"Shrubs or small trees to 12 m high. Leaflets with pustulate domatia below. Fruit capsules c. 15 × 13–15 mm; seeds 8–10 × 6.5–7 mm (north Qld)"	"Cupaniopsis foveolata"
11	"Leaflets with domatia below. Disc glabrous or short hairy all over"	12
11	"Leaflets without domatia below. Disc with hairs in 5 tufts"	14
12	"Leaflets ovate to narrow-ovate"	"Cupaniopsis dallachyi"
12	"Leaflets elliptic, oblanceolate, obovate"	13
13	"Leaflets small (18–72 (–85) × 8–32 (–37) mm). Petals + ovate, 1.3–1.8 mm long. Fruit capsules 11–12 mm long, orange; arilloid yellow, seed black (Cape York Peninsula)"	"Cupaniopsis fleckeri"
13	"Leaflets large (42–185 × 15–56 mm). Petals + flabellate, 1.8–3 mm long. Fruit capsules 22–35 mm long, fawn-yellow; arilloid red, seed tan-brown (Wet Tropics)"	"Cupaniopsis papillosa"
14	"2º veins in leaflets 2–5 mm apart"	"Cupaniopsis parvifolia"
14	"2º veins in leaflets 6–20 mm apart"	15
15	"Small spreading tree to 15 m tall. Leaflet upper surface vernicose; 3º and 4º venation fine. Fruit capsules externally glabrous"	"Cupaniopsis anacardioides"
15	"Tall straight trees to 25 m tall. Leaflet upper surface slightly shiny; 3º and 4º venation coarse. Fruit capsules externally puberulent"	"Cupaniopsis simulata"