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Species of this Genus


Annual or perennial, herbs. Stem solitary, usually branched. Synflorescence corymbiform but sometimes weakly so. Capitula with usually 20-50 florets. Involucre campanulate to urceolate. Phyllaries glabrous or hispid; outer phyllaries in several series, gradually longer centripetally, imbricate; inner phyllaries linear-lanceolate to linear, equal in length. Receptacle naked. Florets yellow. Achene homomorphic; body fusiform to narrowly ellipsoid, often somewhat curved, with 5 faintly secondarily ribbed main ribs, transversely wrinkled, apically truncate or contracted into a short beak sculptured as body. Pappus white, of stiffly fimbriately plumose bristles, often outermost bristles shorter and scabrid.