Seeds of South Australia
Lepidium pseudotasmanicum (Cruciferae)
Shade Peppercress
List of species for Lepidium
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Seed collecting:
January to December
Herbarium regions:
Flinders Ranges, Northern Lofty, Murray
NRM regions:
Adelaide and Mount Lofty Ranges, Northern and Yorke, South Australian Murray-Darling Basin
IBRA region
Olary Spur (FLB03)Flinders Lofty Block
 Vulnerable   (IUCN: VU D2)
Southern Flinders (FLB04) 
 Vulnerable   (IUCN: VU D2)
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 Lepidium]
Name derivation:
Lepidium from the Greek 'lepis' meaning a scale; referring to the appearance of the fruits. Pseudotasmanicum from the Greek 'pseudo' meaning false and Tasmanica meaning of or from Tasmania; possibly referring to the incorrect initial distribution of the species to only Tasmania.
Distribution:
Found in the southern Flinders Ranges, Mid-North and along the Murray  River in South Australia, growing in rocky areas. Also found in Western Australia, New South Wales, Victoria and Tasmania.
Status:
Native. Rare in South Australia. Uncommon in Western Australia, New South Wales and Tasmania. Common in Victoria.
Plant description:
Erect annual or biennial herb to 40 cm high, stem glabrous or with scattered hairs. Leaves with short hairs, basal leaves to 9 cm long, pinnate with narrow linear lobes, stem leaves reducing to linear and entire. Inflorescence an elongating spike with small white flowers, petals reduced or absent. Flowers possibly throughout the year.
Fruit type:
Brown elliptic pod to 3 mm long and 2 mm wide, wings slight in upper half forming slight narrow notch.
Seed type:
Brown reniform seed to 1.5 mm long and 0.9 mm wide, with fine tuberculated surface.
Embryo type:
Bent.
Seed collecting:
Collect maturing pods those turning pale brown with hard 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 two collections, the seed viability were average to high, ranging from 70% to 85%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA1600 (0.33 g)1015-Nov-2007RJB75917
Northern Lofty
19-Sep-200870%+5°C, -18°C
BGA1600 (0.5 g)30+7-Dec-2009KHB326
Flinders Ranges
Jun-201085%-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
Jun-1793%77 500 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under spring/autumn conditions
Jun-1787%77 500 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under winter conditions
Jun-1780%77 seeds leached in water for 24 h;
1% agar;
Incubated under spring/autumn conditions
Jun-1767%714 seeds leached in water for 24 h;
1% 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)