Seeds of South Australia
Bertya rotundifolia (Euphorbiaceae)
Kangaroo Island Bertya
List of species for Bertya
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Seed collecting:
November to December
Herbarium region:
Kangaroo Island
NRM region:
Kangaroo Island
IBRA region
Kangaroo Island (KAN01)Kanmantoo
 Least Concern
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 Bertya]
Name derivation:
Bertya named after Count Léonce de Lambertye (1810-1877), a French botanist and horticulturist at Chaltrait. Rotundifolia from the Latin 'rotundus' meaning round and 'folium' meaning a leaf, referring to the species having rounded leaves.
Endemic to South Australia and found only growing on laterite soil, on the eastern side of Kangaroo Island, .
Native. Rare in South Australia.
Plant description:
Low shrubs to 2 m high with ascending stems covered with in dense grey to light brown hairs. Leaves on short  stout pedicels, ovate or orbicular to 10 mm long with recurved margins, becoming hairless above; concave and covered in white hairs below. Flowers brown, leathery, solitary. Flowering between August and October.
Fruit type:
Green ovoid to oblong capsule to 6 mm long and 3.5 mm wide.
Seed type:
Mottled brown oblong seed to 8 mm long and 4.5 mm wide.
Embryo type:
Seed collecting:
Collect mature capsules, fat, dull green and contain dark, hard seed. Keep a close eye on maturing fruit as it will quickly open and release the seeds. 
Seed cleaning:
Place the capsules in a tray and leave to dry for a week or two. Capsules will split and release the seeds or you can gently rub the capsules with a rubber bung to dislodge the seeds. Use a sieves 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:
Seed viability can be variable and seeds are prone to predation. From one collection, the seed viability was high, at 80%.
Seed germination:
This species is generally difficult to germinate, it has morphophysiological dormancy and complex germination requirements.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
950 (20.75 g)
1035 (22.5 g)
~10012-Dec-2004MKJ 50
Kangaroo Island
Kangaroo Island
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.