Citation: Besser, Enum. Pl. 27 (1822).

Synonymy: Sisymbrium amphibium L. var. palustre (L.)Leysser, Fl. Halensis edn 2, 166 (1783); Nasturtium palustre (L.)DC., Reg. Veg. Syst. Nat. 2:191 (1821); N. terrestre (With.)R. Br. in W.T. Aiton, Hort. Kew. edn 2, 4:110 (1812); S. terrestre With., Bot. Arr. Brit. Pl. edn 2, 2:692 (1787); N. semipinnatifidum Hook., J. Bot.(Hooker) 1:246 (1834); N. terrestre (With.)R. Br. var. semipinnatifidum (Hook.)Hook. f., Fl. Tasm. 1:21 (1855); S. barbareaefolium Del., Fl. Aegypt.Ill. 67 (1813); Cardamine palustris (Wimmer & Grab.)Peterm. forma barbareaefolia (Del.)Kuntze, Rev. Gen. Pl. 1:25 (1891). , Rorippa islandica, Sisymbrium palustre

Common name: Yellow (or marsh) cress, marsh watercress.

Description:
Annual or biennial, erect, 10-60 cm tall; leaves deeply lyrate-pinnatifid with the base auriculate, margin irregularly serrate, 2-12 cm long.

Sepals c. 1.5 mm long; petals 1-2 mm long, yellow; stamens 6.

Siliqua inflated, curved, mostly 8-9 mm long, 2-3 mm wide; valve nerveless, style 0.5-1 mm long; pedicels spreading to horizontal, 4-10 mm long; seeds ellipsoid, 0.6-0.9 mm long, finely colliculate, in 2 rows, not mucous.

	Rorippa palustris fruit and twig.
Image source: fig 221e in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).

Published illustration: Burbidge & Gray (1970) Flora of the A.C.T., fig. 175 as Rorippa islandica.

Distribution:  A semi-aquatic plant which grows close to settlement. S.Aust.: MU, SL, SE.   W.Aust.; N.T.; Qld; N.S.W.; Vic.; Tas.   Native to Europe and North America. Conservation status: naturalised Flowering time: most of the year.

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