Seeds of South Australia
Cardamine lineariloba (Cruciferae)
Straight-lobed Bitter-cress
List of species for Cardamine
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Seed collecting:
September to December
Herbarium regions:
Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, South East
IBRA region
Glenelg Plain (NCP02)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [(no records) R Bates - named in 2005, loss of habitat & changed hydrology - threats]
Lucindale (NCP03) 
 Endangered   (IUCN: EN B2ab(i,ii,iii,iv))   (Probable Decline)   [(no records) R Bates - named in 2005, less than 100 plants known; changed hydrology - 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 Cardamine]
Name derivation:
Cardamine from the Greek 'kardamon' a name given by Dioscorides for a species of cress, an Indian spice and derived from the Greek 'cardia' meaning heart and 'damaein' meaning to blind; alluding to the reputed heart-strengthening effects of the plant. Lineariloba from the Latin 'linearis' meaning linear, straight and 'lobos' meaning lobe; referring to the species linear leaf lobes.
Distribution:
Found in the South-east in South Australia, growing in drainage lines, saline flats and on streambanks. Old record from Mypogon but now assumed extinct in the Mount Lofty Ranges. Also found in Victoria.
Status:
Native. Rare in South Australia. Rare in Victoria.
Plant description:
Glabrous annual herb to 25 cm high, taprooted or fibrous rooted with slender, erect to ascending stems. Basal leaves to 7 cm long, forming a rosette, simple, entire and narrowly spathulate to almost linear, or pinnately divided with 1–4 forward-projecting, linear lateral lobes and a much longer terminal lobe. Stem leaves similar. Flower spike with few white flowers. Flowering in late winter to spring.
Fruit type:
Long pale brown pods to 2 cm in length, splitting into two.
Seed type:
Small yellow flat reniform seeds to 1 mm long and 0.7 mm wide.
Embryo type:
Bent.
Seed collecting:
Collect maturing pods those turning pale brown with yellow 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%.
Seed germination:
This species has physiological dormancy that need to be overcome for the seed to germinate.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
1700 (0.2 g)
1700 (0.2 g)
50+27-Sep-2013DJD2758
South Eastern
24-Mar-2015100%-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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
September 2014100%9d9d Leach in RO water for 4 days; soak in 500 mg/L gibberellic acid for 48 hours.
1% water agar
Incubated under winter conditions
September 201470%16d16d Leach in RO water for 4 days; soak in 100 mg/L potassium nitrate for 48 hours
1% water agar
Incubated under winter conditions
September 201440%9dNA None
1% water agar
Incubated under winter 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)