Citation: -aquatieum, (L.)Hayek, Sched. Fl. Stiriac. 22 (1905).

Synonymy: Sisymbrium nasturtium-aquaticum L., Sp. Pl. 657 (1753); Nasturtium officinale R. Br. in W.T. Aiton, Hort. Kew edn 2, 4:110 (1812).

Common name: Watercress.

Description:
Perennial, semi-aquatic, stoloniferous; stems decumbent, to 250 cm long; leaves lyrate-pinnatisect to pinnate with 1-5 pairs of pinnae, mostly to 10 cm long.

Sepals 2-3 mm long; petals 3-6 mm long, white; stamens 6.

Siliqua linear, straight or curved, 10-18 mm long, 2-2.5 mm wide; valves with an inconspicuous vein; style to 1 mm long; pedicels spreading to reflexed, 8-12 mm long; seeds ovoid, c. 1 mm long, reticulate with 25-50 depressions per face, in 2 rows, not mucous.

	Rorippa nasturtium-aquaticum twig and seed
Image source: fig 221d in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).

Published illustration: Aston (1973) Aquatic Plants of Australia, fig. 25 as Nasturtium officinale.

Distribution:  A semi-aquatic plant found near to settlement. S.Aust.: FR, EP, NL, MU, SL, SE.   W.Aust.; N.T.; Qld; N.S.W.; Vic.; Tas.   Native to Europe; North Africa and western Asia. Conservation status: naturalised Flowering time: Sept. — April.

SA Distribution Map based on current data relating to specimens held in the State Herbarium of South Australia

Biology: No text

Author: Not yet available