Nasturtium officinale

Perennial, decumbent, stoloniferous, growing in mud or shallow water; stems to 250 cm long, hollow, angular, glabrous. Leaves pinnate or pinnately divided, mostly to 10 cm long, becoming smaller towards inflorescence, lateral segments broadly elliptic, glabrous. Sepals 2–2.5 mm long; petals 2.5–5 mm long, white; stamens 6. Fruit spreading, narrow-oblong, curved, 10–18 mm long (excluding style), c. 2 mm wide; style less than 1 mm long; pedicels spreading, 8–15 mm long; seeds in 2 rows per locule, coat reticulate with 25–50 depressions per face. Flowers spring–autumn.