Perennial Marsh Cress
Rorippa possible from the Latinised form of 'Rorippen', a Saxon vernacular name used by Euricius Cordus or from the Latin 'roro' meaning to be moist and 'ripa' meaning riverbank; referring to the genus habitat in moist places. Laciniata from the Latin 'lacinia' meaning divided into narrow or slender lobes; referring to the leaves.
Distribution and status
Found in the southern Mount Lofty Ranges and along the Murray River in South Australia, growing in moist to wet habitats. Also found in Queensland, New South Wales and Victoria. Native. Rare in South Australia. Common in the other states.
Herbarium regions: Murray, Southern Lofty, Green Adelaide
NRM regions: Adelaide and Mount Lofty Ranges, South Australian Murray-Darling Basin
AVH map: SA distribution map (external link)
Perennial herb to 40 cm high, ascending to erect. Leaves mostly basal, petiolate, usually linear-lanceolate, pinnately lobed, or toothed or entire, to 10 cm long, with scattered, short marginal hairs, stem leaves few and narrow. Inflorescence terminal cluster with white flowers. Flowers throughout the year. Fruits are long brown pod to 45 mm long and 2 mm wide, style to 2 mm long. Seeds are brown flat oblong seeds to 1.5 mm long and 1 mm wide. Seed embryo type is bent.
Seed collection and propagation
Collect seeds between January and May. Collect maturing pods those turning pale brown with orange seeds inside. Be gentle with the pods as they split open easily. Place the pods in a tray and cover with paper to prevent seeds from popping out and leave to dry for a week. Then rub the dried pods gently by hand to dislodge the seeds. Use a sieve to separate the unwanted material. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place. From three collections, the seed viability were high, ranging from 80% to 100%.
|Location||No. of seeds|
|BGA||2,870 (0.37 g)||50+||18-Feb-2009||DJD1501|
|6,500 (1.65 g)|
8,000 (2.05 g)
|BGA||19,500 (4.08 g)||50+||2-Jan-2015||DJD3093|
|BGA||5,400 (1.42 g)||50+||16-May-2016||DJD3324|
|2-May-2017||90%||+5°C, -18°C, -80°C|
|BGA||6,700 (1.480 g)||20+||4-Mar-2021||DJD4014|
|BGA||10,700 (1.896 g)||20+||4-Jan-2022||TST1488|
|BGA||1,620 (0.350 g)||30+||2-Feb-2022||DJD4101|
|BGA||8,650 (2.288 g)||50+||8-Mar-2023||BKB226|
|Date||Result||T0||T50||Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod|
|Jul-16||100%||7||7||leached in water 24 h;|
Incubated under spring/autumn conditions