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Annual or occasionally perennial herb, up to 450 mm high. Leaves alternate, sessile; blade linear, up to 25 x ± 0.5 mm, greyish tomentose to green and glabrescent, glandular. Heads radiate, solitary on long peduncles. Involucral bracts in several series, imbricate, inner bracts with scarious and often brown apex. Flowers: ray and disc florets yellow; Oct. Fruit with cypsela brown, linear, angular-terete; cypsela of ray florets more densely pubescent than of disc florets. Pappus of ray cypsela consisting of obtuse-truncate, white scales only; of disc cypsela consisting of both obtuse-truncate, white scales and basally barbellate, apically plumose bristles.
Annual herb (occasionally perennial), 0.01-0.45 m high, mostly small and delicate. Leaves glandular. Peduncles 10-60 mm long; involucre 4-12 mm wide; involucral bracts 15-50, smooth, inner gradually longer and oblong with a scarious and often brown apical limb, 5-9 x 0.7-1.6 mm. Ray florets 8-35, lamina 2-9 x 0.7-3.0 mm. Disc florets 20-175, perfect, corolla 2.6-4.0 mm long; tube with scattered hairs and often with a collar of hairs just below limb. Flowering time predominantly Aug.-Oct. Pappus of short, flat scales and in disc florets 2-5 outer bristles. Cypselae 2.5-3.8 mm long, with twin hairs.
Glabrescent to cobwebby annual, sometimes perennial, up to 200 mm tall. Leaves linear, 2-25 mm long, glabrescent to cobwebby, especially beneath, and glandular-hairy, with margins rolled under. Flowerheads solitary on slender, wiry peduncles, radiate, yellow, 6-10 mm diam.; involucral bracts with papery, often brownish tips. Pappus bristles barbellate in lower half and plumose above.
Slender, glabrescent to cobwebby annual, sometimes perennial, to 20 cm. Leaves linear, glandular-hairy. Flower heads radiate, solitary on wiry peduncles, yellow; pappus bristles plumose above.
A herb. Usually it grows each year from seed. It grows 45 cm tall. The leaves are narrow and hairy. They are 2.5 mm by 0.5 mm. The flower heads are yellow.
