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Annual herb, 0.3-1.0 m high; sometimes shrubby. Leaves opposite, sessile or subpetiolate, oblong-lanceolate, base connate and sheathing stem, margins entire, roughly hairy. Capitula radiate, large, solitary, terminal on long, hollow peduncle, swollen below capitulum; involucre campanulate; bracts in 4 series, oblong-elliptic, apex rounded, papery, dark margined. Receptacle conical to concave, with paleae conduplicate. Ray florets female, fertile; corolla strap-shaped, inner surface reddish or brownish red, drying purplish, persistent. Disc florets bisexual, fertile; corolla brownish yellow, tubular, 5-toothed. Anthers with small apical appendage, base obtuse. Style branches long, linear. Pappus of a single lateral awn. Cypselae 3-angled or compressed, narrowly oblong-obovate in outline.
Annual herb, up to 0.5 m high. Leaves opposite, sessile or subsessile; blade oblong or narrowly ovate, up to ± 60 x 15 mm, margins entire, often with 3 prominent main veins, rough-hairy. Heads radiate, terminating main and short, corymbosely arranged lateral branches; peduncles gradually thickened upwards. Involucral bracts ± 4-seriate, imbricate, oblong-elliptic, apex rounded, papery, dark-margined. Receptacle with palea enveloping disc florets. Flowers: ray florets female, fertile, reddish or brownish red, rarely yellow; disc florets bisexual, yellowish to red or brownish red; Nov.-Apr. Fruit with cypsela narrowly oblong-obovate, 10 mm long; outer ± 3-angled; inner compressed. Pappus of a single lateral awn, absent in ray cypsela.
Annual herb to about 0.5 m. Leaves opposite, sessile or subpetiolate, up to c. 6 x 1.5 cm, oblong-lanceolate, they and the stem rough-hairy. Heads up to c. 6 cm across the expanded rays, terminating the main and short corymbosely arranged lateral branches, peduncles gradually thickened upwards. Involucre campanulate, bracts in c. 4 series, oblong-elliptic, tips rounded, papery, dark-margined. Rays reddish or brownish-red, persistent, drying purplish. Achenes c. 10 mm long, narrowly oblong-obovate in outline, outer more or less 3-angled, inner compressed. Pappus of a single lateral awn, wanting in the ray achenes.
Annual herb, up to 500 mm tall. Leaves opposite, sessile or subsessile, oblong-lanceolate, rough-hairy. Heads terminating main and short corymbosely arranged lateral branches. Involucral bracts dark-margined. Flowers with reddish or brownish red rays, disc yellowish to red or brownish red.
Annual herb, 30–60 cm high.. Leaves (sub-)sessile, ovate or oblong, to 4.5 x 2 cm, scabridulous.. Capitula terminal and solitary; ray florets red, pink or purple, to 15 x 11 mm; disc florets brownish.. Pappus absent.
