Seeds of South Australia
Rorippa gigantea (Cruciferae)
Large Cress
List of species for Rorippa
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Seed collecting:
December to January
Herbarium region:
Southern Lofty
NRM region:
Adelaide and Mount Lofty Ranges
IBRA regions
Fleurieu (KAN02)Kanmantoo
 Vulnerable   (IUCN: VU D2)   [short-lived perennial; fluctuates]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Vulnerable   (IUCN: VU D2)   [short-lived perennial; fluctuates; more pops known; blackberry a threat]
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. Gigantea from the Latin 'giganteus' meaning  very large; referring to the larger leaves and habitat of the species.
Distribution:
Found in the southern Mount Lofty Ranges in South Australia, growing in moist creekline. Also found in Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Rare in South Australia. Common in the other states.
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.
Fruit type:
Long brown pod to 40 mm long.
Seed type:
Brown ovoid seeds to 2 mm long and 1.2 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 90%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA5300 (3.4 g)723-Dec-2009DJD1800
Southern Lofty
Jun-201090%-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.