Aromatic, much-branched, glabrous shrub up to c. 1 m tall, becoming distinctly woody toward base. Stems striate. Lvs glaucous to green, ovate, cuneately narrowed to winged petiole, 2-3-pinnatisect, up to c. 12 × 5 cm; segments all in one plane, very variable in width, from all similar and linear or subulate, to primary segments broad and pinnatisect to c. 1/2 way with narrow ultimate segments; uppermost cauline lvs smaller and sometimes 1-pinnatisect. Involucral bracts 5-15 mm long; margins membranous; at least the inner bracts with large apical flap. Capitula few to many in corymbs, or sometimes solitary, 20-50-(80) mm diam.; ray florets (8)-12-28; ligules usually white, rarely pink; disc florets numerous, yellow. Achenes pale brown, eglandular; achenes of ray florets 3-5 mm long, 3-(4)-angled, with 2-3 angles broadly winged and others narrowly winged, faces smooth or shallowly ribbed, and an irregularly lobed corona 1-1.5 mm long; achenes of disc florets 2-3 mm long, obconic, laterally flattened, mostly ± 4-angled with inner angle winged, surfaces smooth or ribbed, and an irregularly lobed corona up to 0.5 mm long; innermost achenes often ± terete, 10-ribbed, not winged.