| 1 | Bract and bracteoles distinct, (sub)foliaceous, forming an involucre. |
| 1' | Bracts and bracteoles minute, setaceous or linear, mostly scattered, not involucre-like. |
| 2 | Hypanthium long, mostly bowl-shaped or infundibuliform or tubiform. |
| 2' | Hypanthium rather shallow, ± saucer-shaped. |
| 3 | Operculum (inner corona) not plicate |
| 3' | Operculum (inner corona) plicate, mostly with crenulate, or crispy or laciniate edge. |
| 4 | Petals absent. |
| 4' | Petals present. |
| 5 | Inflorescences mostly shortly peduncled, (1-)3-30-flowered; flowers 2-4½ cm ø (sepals 10-20 mm), tepals (creamy-) white, outer corona filaments in 2 rows. |
| 5' | Inflorescences sessile, 1-2-flowered; flowers 5-10 cm ø (sepals (20-)25-50 mm), tepals pink to red, or bluish; outer corona filaments in 1 row or connate into a tube. |
| 6 | Petiole without glands |
| 6' | Petiole provided with glands (Group I). |
| 7 | Leaves shallowly 3-lobed, each lobe distinctly mucronate, leaf-base also with 2 mucros. |
| 7' | Leaves without distinct mucros. |
| 8 | Petiolar glands at apex or in upper ⅓ of petiole. |
| 8' | Petiolar glands situated in the lower ⅔ of the petiole. |
| 9 | Filament connate for the lower ⅓-½, enveloping the ovary; ovary hairy; leaf top acute. |
| 9' | Filaments above androgynophore ± free; ovary glabrous; leaf truncate or ± 2-3-lobed. |
| 10 | Outer corona filamentous, inner corona (operculum) tubiform, 5-15(-20) mm, reddish or whitish; flowers pinkish to orange or red (Group II). |
| 10' | Outer corona broadly tubiform, 20-30 mm, purple-blue, inner corona small, incised, 1-2 mm; flowers bluish (Group III). |
| 11 | Blade-base or petiole with glands. |
| 11' | Blade-base or petiole without glands (extra-Malesian). |
| 12 | Plant pubescent, rarely glabrescent; glands often ± stiped; tops of leaf lobes ± acute; corona filaments whitish, inner corona distinctly plicate with shallowly lobulate-crenulate edge. Australia: Queensland, New South Wales |
| 12' | Glabrous; glands sessile, flat; tops of leaf lobes acute, rounded, or emarginate; corona filaments purplish red, inner corona ± wrinkled in the upper half, with shallowly lobulate-crenulate edge. Australia, Norfolk I. |
| 13 | Gynophore long; outer corona filaments whitish, longer than the whitish inner corona which has a densely fine-fimbriate edge. Australia: Victoria |
| 13' | Gynophore short; outer corona filaments purplish red, about as long as or shorter than the inner corona, which has a shallowly lobed edge. Australia, Norfolk I. |
