Seeds of South Australia
Irenepharsus phasmatodes (Cruciferae)
Kangaroo Island Cress
List of species for Irenepharsus
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Seed collecting:
November to March
Herbarium region:
Kangaroo Island
NRM region:
Kangaroo Island
IBRA region
Kangaroo Island (KAN01)Kanmantoo
 Near Threatened   [abundant after fire, fluctuates, restricted to west end; could be Rare]
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 Irenepharsus]
Name derivation:
Irenepharsus from the Greek 'irene' meaning peace and 'pharsos' meaning a piece; referring to the resolution of a taxonomic problem. Phasmatodes possibly from the Greek 'phasm' meaning phantom; referring to the cryptic nature of the species, appearing only after fire.
Endemic to South Australia and found only on the western end of Kangaroo Island, growing on laterite soil.
Native. Rare in South Australia. More common post fire.
Plant description:
Erect annual or biennial, sparingly branched herb to 90 cm tall, stems glabrous. Basal leaves rosette and pinnate, persisting. Stem leaves sparse, to 6 cm long, linear, entire. Flowers along a short spike with large white flower. Flowering between November and February.
Fruit type:
Brown cylindrical pod to 22 mm long and 1.5 mm wide.
Seed type:
Dark brown reinform seed to 1.2 mm long and 0.7 mm wide, with small net-like surface.
Embryo type:
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 high, ranging from 85% to 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)
of plants
Collection number
Collection location
% ViabilityStorage
7700 (1.48 g)
6800 (1.3 g)
Kangaroo Island
BGA8000 (1.55 g)25+15-Dec-2008MJT218
Kangaroo Island
20-Jul-2009100%+5°C, -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.