Tribe 6. SenecionideÆ.

Heads heterogamous, radiate or discoid; or with the ray deficient and then homogamous. Involucral bracts usually in a single row, with a few small ones at the base. Receptacle usually naked. Anther-cells sometimes sagittate at the base, but with no true tails. Style-branches truncate or appendiculate. Pappus of capillary bristles.