Seeds of South Australia
Phlegmatospermum richardsii (Cruciferae)
Nullarbor Cress
List of species for Phlegmatospermum
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Seed collecting:
September to November
Herbarium regions:
Nullarbor, Eyre Peninsula
NRM regions:
Alinytjara Wilurara, Eyre Peninsula
IBRA regions
Eyre Mallee (EYB05)Eyre Yorke Block
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)
Yalata (NUL03)Nullarbor
 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 Phlegmatospermum]
Name derivation:
Phlegmatospermum from the Greek 'phlegma' meaning inflammation and 'sperma' meaning a seed; referring to the mucous seeds. Richardsii named after Annie Frances Richards (1845-1930), who lived at Fowler Bay, South Australia and collected plants for Mueller.
Distribution:
Found on the Nullarbor in South Australia, growing on sandy soil in open moss covered mallee, Also found in Western Australia.
Status:
Native. Very rare in South Australia. Very rare in Western Australia.
Plant description:
Erect annual herbs to 20 cm tall, covered in hairs. Basal leaves obovate, to 7 cm long, dentate to entire, stem leaves obovate to oblanceolate, to 4 cm long, shallowly lobed or entire. Inflorescence an elongated spike with yellow flowers. Flowering between July and September.
Fruit type:
Brown elliptic to ovate pod to 1 cm long, scarcely winged or notched, valves hairy.
Seed type:
Orange reniform seed to 1.5 mm long and 1.2 mm wide, with very fine tuberculates.
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 one collection, the seed viability was high, at 90%.
Seed germination:
No information available
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
7100 (5.86 g)
7100 (5.86 g)
200+15-Sep-2009DJD1525
Nullarbor
Jun-201090%+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.