Matthiola longipetala subsp. bicornis

Annual, to 50 cm high. Leaves toothed to pinnately lobed at base, becoming entire towards inflorescence, petiolate. Sepals 8–11 mm long; petals 15–25 mm long, purple to pink. Fruit erect to spreading, linear, 4–15 cm long, 1–2 mm wide; valves convex; apex with two lateral horns curved upwards, 2–10 mm long; pedicels spreading, 1–3 mm long.  Flowers throughout year, opening at night or on dull days (presumably pollinated by moths).