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Perennial herb (flowering first year), (0.15-)0.40-0.50(-0.90) m high; glabrous or occasionally loosely pilose at base. Stipular glands present throughout or absent above. Leaves linear to ovate, 10-20 x 1-4 mm. Panicles open. Flowers mostly short-pedicelled. Sepals lanceolate to ovate, outer entire or very sparsely toothed, inner usually with glandular-toothed margins. Petals oblanceolate. Stamens 3.0-4.5 mm long, staminodia none. Styles 2-4 mm long. Flowering time Nov.-Apr. Fruit broadly ovate to turbinate, apiculate. Seeds 1.5 x 1 mm.
Perennial herb, up to 500 mm high. Stems slender, branching above. Leaves sessile, opposite at base of stem, becoming alternate higher up; blade linear to narrowly elliptic or ovate, 10-20 x 1-4(-8) mm, apex acute; dark brown stipular glands present at base. Flowers: in an open, terminal, many-flowered cyme; short-pedicelled, pedicels glabrous; outer sepals entire or serrate; styles free; corolla ± 15 mm wide, yellow; Nov.-Mar. Fruit an ovoid capsule, dehiscing into 101-seeded segments.
Leaves opposite (rarely whorled) at the stern base, becoming alternate towards the inflorescence; lamina of average leaves 9–20 (25) × (1) 2–5 (6) mm., oblong-lanceolate to oblong-elliptic to linear (rarely oblanceolate), acute or mucronulate at the apex, with margin entire sometimes involute, those towards the stem base broader and often more obtuse or rounded at the apex, 1 (3)-nerved; stipular glands globose or ellipsoid, dark brown, sometimes absent.
Subshrub with slender stems from persistent base, to 50 cm. Leaves opposite below, sessile, linear to elliptic, sometimes ovate, with stipular glands sometimes only below. Flowers in panicles, yellow, styles free.
Sepals 2–3 mm. long, elliptic to ovate-elliptic, acute to sharply acuminate, with the margin entire or, more usually, ciliate to glandular-dentate or glandular-ciliate, and the midrib extending to the apex.
Perennial herb, up to 500 mm tall. Leaves linear to elliptic or ovate, 10-20 x 1-4(-8) mm, stipular glands present. Pedicels glabrous. Outer sepals entire or serrate. Styles separate. Flowers yellow.
Herb 15–60 cm. high or sometimes higher, erect or suberect, perennial (or sometimes annual?), glabrous or very rarely with the lower leaves and parts of the stem sparsely pubescent.
Inflorescence a lax monochasial or subdichasial paniculate or corymbose cyme, usually many-flowered; bracts small, linear; pedicels 1–2 mm. long, elongating in fruit.
Stems single or in groups, unbranched for most of their length or more rarely branched in the lower half, ridged above, becoming terete towards the base.
Ovary c. 0·75 mm. long, ovoid-ellipsoid; styles c. 4 times as long as the ovary and just exceeding the stamens, free, linear; stigmas slightly capitate.
Petals chrome-yellow, sometimes tipped purplish-red in bud, 5–10 mm. long, obovate to obovate-oblanceolate, rounded or retuse at the apex.
Stamens c. 3–4 mm. long, with filaments united in the lower quarter; anthers c. 0·5 mm. long, oblong; staminodial processes absent.
Capsule about as long as the sepals, globose or depressed-globose, yellow-brown, sometimes purplish towards the apex.
Seeds c. 1·2 mm. long, ellipsoid, plano-convex, reddish-brown to yellowish-brown, smooth, shining.
Flowers homostylic.
