Sepals erect with spreading tips; petals clawed. Stamens 6, or rarely fewer; stigmas simple or 2-lobed, subsessile; siliques linear, straight; ovules us. ∞, in one series, flattened; cots accumbent. Annual or perennial herbs, glab. or pubescent; lvs simple to compound. About 120 spp., mainly of temperate regions. is reported from Macquarie Id; occurs there and is reported from Fuegia. The other N.Z. spp. are endemic.

Annual to perennial rhizomatous or taprooted herbs. Hairs simple or 0. Stems ascending to erect, sparsely leafy. Lvs simple and entire to pinnatifid or pinnate; lobes entire or bluntly to sharply lobed or toothed. Racemes ebracteate, sometimes contracted to a loose umbel or corymb, sometimes whole infl. sessile. Sepals erecto-patent, the inner slightly saccate. Petals white, rarely pink or mauve, or 0. Stamens (4)-6. Lateral nectaries 2, in a circle or semicircle around single stamens; median nectaries 2, variously shaped, outside paired stamens. Style long or short; stigma capitate or 2-lobed. Silique linear, dehiscent; valves veinless or with a weak median vein, flat, coiling suddenly and tightly from base at dehiscence, glabrous or hairy; beak 0. Seeds ellipsoid, not or barely winged, in 1 row per locule.