| 1 | Leaves entire, elliptic, oblong to lanceolate. |
| 1' | Leaves distinctly shallowly or deeply lobed. |
| 2 | Involucral bracts 2 |
| 2' | Involucral bracts 4. |
| 3 | Seeds ovate to ovate-oblong in outline, convex-concave, dorsoventrally flattened, more or less shell-shaped. Fig. 5a-b. Involucral bracts not decussate, 2 outer ones opposite, 2 inner ones more or less in the axils of one of the outer ones |
| 3' | Seeds reniform, laterally flattened. Fig. 5c-d. Involucral bracts more or less decussate. |
| 4 | Leaves palmately divided into 3 lobes, each lobe pinnately divided into numerous smaller ones. Filiform bracts present |
| 4' | Leaves palmately incised and/or divided into 3-13 lobes, each lobe simple or only palmately divided into few ± similar lobes. Filiform bracts absent. |
| 5 | Leaves and inflorescence(s) crowded in a hollowed portion of a tuberous, roundish rhizome. Flowers inserted on the end of the scape between the bracts. |
| 5' | Leaves and inflorescence(s) all spaced on an elongated, horizontal, cylindrical, tuberous rhizome. Flowers inserted on the basal portion of the inner two bracts. |
| 6 | Outer involucral bracts oblong-ovate, 1-2.5 by 0.4-1 cm, inner ones cordate, 3-4.5 by 1.5-2 cm. Inner perianth lobes obovate, 5-6 by 3-4 mm, with rounded apex. Fruit obpyramidal, 1.3-1.5 by 0.8-1.2 cm |
| 6' | Outer involucral bracts broadly-ovate to ovate, 2.5-9.5 by 2-9 cm, inner ones broadly-ovate to cordate, 4.5-10 by 2.5-6 cm. Inner perianth lobes constricted halfway, 3-5 by 2-4 mm, the apex acuminate. Fruit globose, up to 1 cm in ø |
| 7 | Leaves simple, palmately incised for almost ⅓ of their length. Fruit ellipsoid to obovoid, 2.2-3 by 1 by 1 cm |
| 7' | Leaves palmately compound, with 5 stalked leaflets of which the outer 2 may be connected at the base. Fruit obpyramidal, 1.8 by 1 by 0.8 cm |
