Arabidopsis thaliana (L.) Heynh.

Annual herb; rosette small. Stems erect, 5–20–(40) cm tall, bearing patent simple hairs below. Lvs all hairy, with simple, 2-fid and branched hairs. Rosette lvs petiolate; lamina ovate to obovate, entire or very shallowly and bluntly toothed, (3)–5–25 × (2)–3–10 mm. Stem lvs few, smaller, simple, sessile, obovate to narrow-ovate, cuneate at base. Racemes 10–20–(40) cm long. Pedicels slender, erecto-patent, spreading at fruiting, 5–7 mm long. Sepals oblong, 1–1.5 mm long, glabrous or with a few hairs at apex. Petals white, narrow-obovate, 2.5–3.5 mm long. Stamens 6, rarely 4, slightly < petals. Silique held at slight angle to pedicel, curving upward, glabrous, (8)–10–15 × c. 0.5 mm; style c. 0.2 mm long. Seeds brown, 0.3–0.5 mm long, in 1 row per locule.

[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]

Flowering: (Jul.)–Sep.–Jan.–(Mar.); Fruiting: (Jul.)–Sep.–Jan.–(Mar.)