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Perennial upright subshrub, 20–100 (–125) cm high, corymbosely branched, basally woody; young shoots glandular-pubescent, becoming glabrous. Leaves thick, basally cuneate, glandular-puberulous; lower leaves obovate to elliptic-oblong, 5–8 cm long, 1–2 cm wide, coarsely remotely toothed; upper leaves oblanceolate-oblong, 2–3 cm long, 3–5 mm wide, ±semi-amplexicaul, ± entire. Capitula solitary and terminal at apices of branches, or in lax corymbs, 2.5–3 cm diam.; peduncles ebracteate, 5–15 cm long; involucre campanulate, 1–1.5 cm high, ±biseriate; bracts lanceolate or linear-lanceolate, (8–) 10–15 mm long, 2–3.5 mm wide, scarious-margined, acuminate, glandular-puberulous, brownish. Ray florets up to 20 (–22); ligules 1.5–3 cm long, white or pinkish-white above, indigo or blue to violet with white margin beneath. Disc florets bright blue or ±purplish-blue; lobes hooded. Achenes 3-angled, 6.5–7 mm long, narrowly winged, slightly reticulate-rugulose.
Suffruticose or perennial plant, up to 1 m high, erect to decumbent, sometimes woody at base. Leaves alternate, linear-lanceolate or lanceolate, sessile, simple, elliptic, slightly succulent and margins entire to conspicuously dentate, crowded at ends of branches; lower branches quite hairless. Capitula up to 80 mm in diam.; borne singly or in a few groups at end of branches on short stalks (peduncles). Ray florets long, bright white on upper side and light blue or violet on lower side. Disc florets dark blue or purple. Flowering time Sept.-May. Cypselae of ray florets smooth, obovoid and triangular.
Sprawling, glabrescent, softly woody shrub, sometimes to 1.5 m. Leaves elliptic, mostly petiolate and toothed. Flower heads radiate, solitary on long peduncles, violet-blue with white rays. Ray achenes trigonous, ridged and rugose, disc florets sterile.
