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Annual erect herb to 50–80 (–120) cm high. Vegetative parts sericeous or pannose, rarely subglabrous with age. Leaves sessile or petiolate, spathulate or oblanceolate, 30–260 mm long, 5–50 mm wide, variously dentate or serrate or rarely lyrately lobed, concolorous. Capitula 6–8 mm long, in open, contracted or spiciform terminal panicles to 150 mm long, rarely exceeding 300 mm; involucral bracts linear, glandular, villous, rarely subglabrous with age; receptacle convex, glabrous. Florets yellow; disc corollas 3.7–5 mm long, with lobes glandular, conspicuously hairy with simple or simple and septate hairs. Achenes ribbed; c. 1 mm long.
A herb which keeps growing each year. It can grow each year from seeds. It can be 20 cm to 2.5 m. The stems are hairy. They are erect and stiff and brittle. They have a woody rootstock and often grows to 1 m tall. There are many branches. The leaves are produced one after the other on opposite sides of the stem. They are hairy on both surfaces. There are irregular teeth along the edge of the leaf. The flowers develop at the top of the plant. The fruit are brown and with ribs and about 1 mm long.
