Plants of
South Australia
Rorippa gigantea
Cruciferae
Large Cress
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Near threatened
Rare
Vulnerable
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Adelaide
Arkaroola
Ceduna
Coober Pedy
Hawker
Innamincka
Marla
Marree
Mount Gambier
Oodnadatta
Renmark
Wudinna
Keith
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Etymology

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. Gigantea from the Latin 'giganteus' meaning very large; referring to the larger leaves and habitat of the species.

Distribution and status

Found in the southern Mount Lofty Ranges in South Australia, growing in moist creekline. Also found in Queensland, New South Wales, Victoria and Tasmania. Native. Rare in South Australia. Common in the other states.
Herbarium region: Southern Lofty
NRM region: Adelaide and Mount Lofty Ranges
AVH map: SA distribution map (external link)

Plant description

Decumbent to erect annual to 120 cm high, glabrous. Leaves sessile, oblong to lanceolate, to 12 cm long, all or at least lower leaves not lobed, margins entire or toothed with widely spaced teeth, stem leaves reducing, sagittate. Inflorescence small cluster at terminal with white flowers. Flowers in spring and summer. Fruits are long brown pod to 40 mm long. Seeds are brown ovoid seeds to 2 mm long and 1.2 mm wide. Seed embryo type is bent.

Seed collection and propagation

Collect seeds between December and January. 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 one collection, the seed viability was high, at 90%.

Seeds stored:
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LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA5,300 (3.4 g)723-Dec-2009DJD1800
Southern Lofty
1-Jun-201090%-18°C
BGA210225-May-2010T.Jury
Southern Lofty
1-Jan-201690%-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.