Plants of
South Australia
Arabidella eremigena
Cruciferae
Desert Cress (Priddiwalkatji)
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Adelaide
Arkaroola
Ceduna
Coober Pedy
Hawker
Innamincka
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Keith
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Botanical art

Kath Alcock painting: 1.

Etymology

Arabidella is a diminutive of 'arabis' which is a Greek word for mustard or cress. Eremigena from the Greek 'eremites' meaning of the desert and 'genia' meaning born, referring to the species habitat.

Distribution and status

Found in the north-east part of South Australia with isolated collections from Chowilla along the Murray River, growing on sandy loam soil in floodplain and wet depressions. Also found in Queensland and New South Wales. Native. Common in South Australia. Common in the other States.
Herbarium regions: Lake Eyre, Murray
NRM regions: South Australian Arid Lands, South Australian Murray-Darling Basin
AVH map: SA distribution map (external link)

Plant description

Prostrate or erect annual herb to 40 cm tall, with many hairy stems. Basal leaves pinnate with 4-5 lobes to 6 cm long, stem leaves pinnate with 1-4 pairs of lobes, reducing towards the tip. Inflorescence a dense terminal cluster with white or yellow, rarely lavender flowers with four petals. Flowering between July and September. Fruits are long narrow, brown hairy pods. Seeds are tiny yellow semi-flat seeds to 0.7 mm long and 0.4 mm wide. Seed embryo type is bent.

Seed collection and propagation

Collect seeds between August and October. Collect pods that are maturing, drying and turning brown, with yellow seeds inside. Place the pods in a tray and cover with paper to prevent seeds popping out and leave to dry for a week. Then rub the pods with your hands 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 100%. This species has physiological dormancy that need to be overcome for the seed to germinate.

Seeds stored:
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LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
 
MSB

10,600 (0.67 g)
20+29-Sep-2007DJD887
Lake Eyre
95%
BGA72,000 (4.05 g)50+17-Oct-2016JRG487
Lake Eyre
1-Nov-201780%-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:
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