Annual herb, 2-15, sometimes up to 25 cm high. Stems and branches erect or ascending, leafy, glabrous or laxly tomentose and with stalked glands. Leaves alternate or sometimes opposite, spreading, slender, mid-ribbed, linear, 5-20 mm long, 0.3-1.3 mm wide, glandular with stalked glands and sometimes laxly tomentose mainly above, acute-obtuse. Capitula solitary, sessile or occasionally pedunculate, terminal. Peduncles up to 8 mm long. Involucre urceolate, ovate in outline, 1.5-3 mm wide. Involucral bracts 7-25, outer ovate, inner ovate-oblong with a spreading, brown, scarious apical limb, up to 6 mm long, up to 2 mm wide, acute. Receptacle flat, paleate. Paleae lanceolate, canaliculate and marginally flattened and often projected into two lateral teeth, otherwise entire, 4.5-6.5 mm long, 0.6-1.2 mm wide, dorsally sometimes sparsely gland-dotted, acute. Ray-florets 3-9. Tube cylindrical, 1.2-1.8 mm long, with scattered, subulate-triangular hairs. Lamina elliptic, 1.5-2.2 mm long, 0.7-1.3 mm wide, 4-veined. Style 2.2-2.8 mm long; style-branches 0.6-1.4 mm long. Achenes as in discflorets, but more densely villose. Disc-florets 5-25, perfect. Corolla 2.5-3.3 mm long, 0.4-0.6 mm wide. Tube cylindrical, with scattered, subulate-triangular hairs on upper half. Limb cyathiform; corolla lobes 0.3-0.5 mm long. Style 2.5-3.5 mm long; style-branches 0.5-0.7 mm long, apically penicillate and truncate; stylopodium ± distinct. Anthers 1-1.6 mm long; tails c. 1/4 of the length of the anther. Achenes narrowly elliptic, 2-3 mm long, 0.4-0.7 mm wide, ± densely villose with erecto-patent, apically hooked hairs; pappus crownlike, of ± connate scales, up to 0.6 mm long.
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Annual herb, 0.02-0.15(-0.25) m high. Leaves alternate, spreading, linear, 5-20 mm long, 0.3-1.3 mm wide, glandular. Capitula solitary, mostly sessile; involucre urceolate, ovate in outline, 1.5-3.0 mm wide; involucral bracts 7-25, outer ovate, inner ovate-oblong with a spreading apical limb, up to 6 mm long. Receptacle flat, paleate. Ray florets 3-9, tube cylindrical, with scattered hairs, lamina elliptic, 1.5-2.2 mm long, 0.7-1.3 mm wide. Disc florets 5-25, perfect, with scattered hairs in upper half. Flowering time mainly Aug.-Dec. Pappus of crown-like, ± connate scales, up to 0.6 mm long. Cypselae narrowly elliptic, 2-3 mm long, 0.4-0.7 mm wide, ± densely villose with apically hooked hairs.
Erect or spreading annual, up to 200 mm tall. Leaves linear, 5-20 mm long, glandular-hairy and sometimes cobwebby. Flowerheads solitary, sessile or rarely pedunculate, shortly and obscurely radiate, yellow, 3-6 mm diam., receptacle paleate, florets coarsely hairy around middle; involucre urn-shaped.
Like R. pumilum but heads smaller with reduced rays, sessile.
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