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DescriptionErect much branched, aromatic annual herb, rarely a short-lived perennial, up to 180 cm high. Stems green, rarely tinged red. Leaves mostly lanceolate, 3-14 cm long, green, with numerous yellow glands, especially below; margin, particularly of the lower leaves, with up to 10 irregular teeth. Minute flowers in sessile yellowish clusters or 'glomerules' along the ultimate branches, together forming large branched heads.