| Involucral scales few, equal, in a single row, not scarious. |
| Involucre hemispherical, of many small imbricated dry and scarious scales shorter than the disk. |
| Scales of the involucre dry and scarious, white or colored, imbricated in several rows. |
| These bracts are papery and dry, or scarious, with a low water content, unlike leaves or flower parts of other plants. |
| Stipules not scarious, leaves palmately cleft or palmately compound. |
| Receptacle convex to subulate, chaffy, the scarious chaff not embracing the smooth dorsally compressed achenes. |
