Lepidium peregrinum Thell.

Perennial herb to sub-shrub, up to 0.8 m tall. Stems erect to spreading, slightly angular and ridged, sparsely to moderately vestured on surface with short patent hairs. Rosette and lower cauline leaves 80–190 mm long, 12–40 mm wide, petiolate, lamina lyrate-pinnatifid to lyrate-pinnatisect, terminal lobe broad-lanceolate, usually vestured with long-acicular hairs on the upper surface and margins; lateral lobes with distal margins serrate, proximal margins entire. Mid-cauline leaves 30–80 mm long, 1–9 mm wide, petiolate, lyrate-pinnatifid to lanceolate, margins serrate to serrulate; bases auriculate to sagittate, especially on lanceolate leaves. Upper cauline leaves 10–20 mm long, 1–1.5 mm wide, sessile to subsessile, narrow-lanceolate to linear, margins serrate or entire, bases attenuate at the point of leaf insertion. Inflorescences corymbose, elongating to 200 mm when in fruit. Branch-terminal racemes often appearing lateral and leaf-opposed, overtopped by a subtending axillary flowering branch. Rachis glabrous to minutely puberulent towards the apex, slightly angular and ridged. Sepals 0.6–0.9 mm long, 0.4–0.5 mm wide, the adaxial sepal dorsally villous in the upper half, the abaxial sepal glabrous or with one or four hairs, the lateral pair of sepals always glabrous. Petals 0.5–0.8 mm long, 0.1–0.2 mm wide, linear, or absent. Stamens 2, median, 0.9–1.1 mm long. Pedicels 3–5 mm long at maturity, erecto-patent to sub-declinate and usually arcuate at fruiting, sub-terete with a slightly flattened puberulent adaxial surface. Silicules 2.0–3.5 mm long, 1.7–2.2 mm wide, ovate to elliptical, acutely emarginate with triangular wings forming a v-shaped notch. Styles c. 0.1 mm long, included in the notch. Valves green or purple, glabrous. Seeds 1.1–1.5 mm long, 0.6–0.8 mm wide, narrowly ovoid, wingless.

[Reproduced from Heenan & de Lange (2011, New Zealand J. Bot. 49: 489–496) with permission from The Royal Society of New Zealand.]