Seeds of South Australia
Rorippa laciniata (Cruciferae)
Jagged Bitter-cress
List of species for Rorippa
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Seed collecting:
January to May
Herbarium regions:
Murray, Southern Lofty
NRM regions:
Adelaide and Mount Lofty Ranges, South Australian Murray-Darling Basin
IBRA regions
Fleurieu (KAN02)Kanmantoo
 Endangered   (IUCN: VU D2)   [Kuitpo forest area; blackberries, grazed]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Endangered   (IUCN: EN B2ab(i,ii,iii,iv,v); D)   (Probable Decline)   [(no records) Jupiter Ck; blackberry a threat]
St Vincent (EYB02)Eyre Yorke Block
 Regionally Extinct   ()   [extinct in region]
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. Laciniata from the Latin 'lacinia' meaning divided into narrow or slender lobes; referring to the leaves.
Distribution:
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.
Status:
Native. Rare in South Australia. Common in the other states.
Plant description:
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.
Fruit type:
Long brown pod to 45 mm long and 2 mm wide, style to 2 mm long.
Seed type:
Brown flat oblong seeds to 1.5 mm long and 1 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 three collections, the seed viability were high, ranging from 80% to 100%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA2870 (0.374 g)50+18-Feb-2009DJD1501
Southern Lofty
20-Jul-200980%-18°C
BGA 
MSB
6500 (1.65 g)
8000 (2.05 g)
~2012-Mar-2010TST920
Southern Lofty
Jun-2010100%-18°C
BGA490 (0.16 g)2024-May-2010KHB371
Southern Lofty
1-Jan-2012100%
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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jul-16100%7 d7 d leached in water 24 h;
1% agar;
Incubated under spring/autumn conditions
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)