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Perennial herb, up to 0.7 m high; glabrous in all parts except leaf margins, sometimes upper part of midrib minutely puberulous. Stems erect, much branched, leafy. Leaves with blade narrowly linear-obovate, ± 75 mm long, apex acuminate, margins entire. Flowers: in terminal racemes; nectaries elongate-triangular; stamens 2; petals linear-oblong, 0.4-0.5 mm long; white; Jan., Feb. Fruit with pedicels slender, erect, very slightly arcuate; siliculae ovate or ovate-elliptic, 1.4-1.7 x 0.9-1.2 mm, not emarginate; style short, projecting.
Perennial herb, 0.3-0.7 m high, erect, much branched, leafy, glabrous except leaf margins and sometimes upper surface of midrib minutely puberulous. Leaves: upper leaves linear-oblanceolate, acuminate, margins entire. Inflorescence a terminal raceme; pedicels slender, erect, slightly arcuate. Sepals narrowly oblong, green tinged with mauve, margins membranous. Petals linear-oblong, white. Nectaries elongate-triangular. Fruit a silicula, ovate or ovate-elliptic, not emarginate; style short, projecting.
A cabbage family herb. It keeps growing from year to year and grows 70 cm tall. The stems are smooth and leafy and branched. The leaves are simple and narrow. They taper to the tip. The flowers are in a long slender group 10 cm long with many flowers. The flowers are small and white. The fruit is a narrowly oval seed capsule.
