1	"Annual herb or short-lived perennial; calyx membranous and inflated after flowering."	"Hibiscus trionum"
1	"Trees, shrubs or subshrubs; calyx neither membranous nor inflated after flowering."	2
2	"Flowers either more than 5 cm long or if 3–5 cm then yellow; trees or shrubs; areas east of the Divide."	3
2	"Flowers either less than 3 cm long or if to 3.5 cm then pink; subshrubs; areas west of the Divide except for garden escapes."	6
3	"Epicalyx segments united at the base to form a cup; stipules leafy."	"Hibiscus tiliaceus"
3	"Epicalyx segments free to the base; stipules linear."	4
4	"Leaves without glands; peduncle articulate c. 10 mm below flower."	"Hibiscus splendens"
4	"Leaves with glands present on dorsal basal midrib; peduncle articulate at the base."	5
5	"Erect or spreading shrub 1–2 m high, stems with a fine pubescence and interspersed with prickles."	"Hibiscus diversifolius"
5	"Erect shrub or small tree to 6 m or more high, glabrous or glabrescent, stems with prickles."	"Hibiscus heterophyllus"
6	"Upper leaves entire; capsule silky."	7
6	"Upper leaves lobed; capsule glabrous or hairy, but not silky."	8
7	"Indumentum rusty."	"Hibiscus sturtii"
7	"Indumentum white, velvety."	"Hibiscus krichauffianus"
8	"Small low-growing shrub up to 0.5 m high; corolla 10–15 mm long; capsule glabrous."	"Hibiscus brachysiphonius"
8	"Shrub 1–3 m high; corolla 30–40 mm long; capsule hairy; garden escape"	"Hibiscus pedunculatus"