1 | Blade peltate, radially incised. |
1' | Blade basally attached, entire or palmately incised. |
2 | Staminate flowers with 1 stamen, or 2 or 3 connate stamens; pistillate flowers sessile in globose (to ellipsoid) heads; fruits small, 1-3 mm long; scars of the stipules usually ascending. |
2' | Staminate flowers with 4 or 3, free stamens; pistillate flowers pedicellate (to subsessile), solitary or in non-capitate clusters; fruits large, at least 10 mm long; scars of the stipules transverse. |