Seeds of South Australia
Rorippa eustylis (Cruciferae)
River Cress
List of species for Rorippa
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Seed collecting:
January to December
Herbarium regions:
Lake Eyre, Murray
NRM regions:
South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   [1 record Mt Crawford, also in Mt Bold; River Murray sp, adventive]
Murray Mallee (MDD02)Murray Darling Depression
 Vulnerable   (IUCN: VU B2ab(i,ii,iii); D2)   (Probable Decline)
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA bd(ii))   (Probable Decline)   [not recently seen]
Strzelecki Desert (SSD05)Simpson Strzelecki Dunefields
 Rare   (IUCN: RA d(ii))   [confined to creeks]
Coongie (CHC06)Channel Country
 Rare   (IUCN: RA d(ii))   [confined to creeks]
RSCA map:
Regional Species Conservation Assessments per IBRA subregion. Please click the thumbnail map.
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Rorippa]
Name derivation:
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. Eustylis from the Greek 'eu' meaning good and 'stylos' meaning style.
Distribution:
Found in the north-eastern corner and along the Murray River in South Australia, growing in swamps and flood-plains. Also found in all mainland states.
Status:
Native. Uncommon in South Australia. Rare in Western Australia and Victoria. Uncommon in the Northern Territory. Common in the other states.
Plant description:
Annual or ephemeral herb to 30 cm high, decumbent to ascending, much-branched from base, glabrous or hairy. Leaves petiolate, 1–2-pinnately divided, to 9 cm long, lobes coarsely toothed. Inflorescence a loose spike with white flowers. Flowers throughout the year.
Fruit type:
Long brown pod to 25 mm long and 1 mm wide, style to 1.5 mm long.
Seed type:
Small orange ovoid seeds to 0.6 mm long and 0.4 mm wide.
Embryo type:
Bent.
Seed collecting:
Collect maturing pods those turning pale brown with orange seeds inside. Be gentle with the pods as they split open easily.
Seed cleaning:
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.
Seed viability:
From one collection, the seed viability was high, at 100%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
9300 (0.43 g)
9300 (0.43 g)
100+27-Sep-2007DJD872
Lake Eyre
19-Sep-2008100%-18°C
Location: BGA — the seeds are stored at the Adelaide Botanic Gardens, MSB — the seeds are stored at the Millennium Seed Bank, Kew, England.
Number of plants: This is the number of plants from which the seeds were collected.
Collection location: The Herbarium of South Australia's region name.
% Viability: Percentage of filled healthy seeds determined by a cut test or x-ray.