Seeds of South Australia
Poranthera triandra (Euphorbiaceae)
Three-petal Porantha
List of species for Poranthera
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Seed collecting:
October to December
Herbarium regions:
Eyre Peninsula, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Murray-Darling Basin, South East
IBRA regions
Bridgewater (NCP01)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(ii))
Lucindale (NCP03) 
 Rare   (IUCN: RA d(ii))
Tintinara (NCP04) 
 Least Concern   [lots in Gum Lagoon & Bunbury CP]
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(i,ii))   [only a few records]
Fleurieu (KAN02) 
 Rare   (IUCN: RA d(ii))   [comes up after fire; limited habitat]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Vulnerable   (IUCN: VU D2)   [grows on limestone; limited habitat; in Torrens Gorge]
Broughton (FLB02) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Definite Decline)   [Restricted habitat. ]
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern   [Possibly under collected.]
St Vincent (EYB02) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Definite Decline)
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))
Murray Lakes and Coorong (MDD03) 
 Rare   (IUCN: RA d(ii))   [ephemeral, likes fire]
IBRA regions
3 of 4 subregionsNaracoorte Coastal PlainLeast Concern
, Rare
2 of 2 subregionsKanmantooRare
2 of 6 subregionsFlinders Lofty BlockVulnerable
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Vulnerable
2 of 6 subregionsMurray Darling DepressionRare
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 Poranthera]
Name derivation:
Poranthera from the Greek 'porus' meaning opening or pore and 'anthera' meaning anther; referring to the terminal pores of the anther cells. Triandra from the Greek 'treis' meaning three and 'andros' meaning man or stamen; referring to the male flowers which have 3 stamens.
Found in the southern part of South Australia, growing mainly in or near coastal areas on Sand over limestone. Also found in Western Australia and the Northern Territory.
Native. Common in South Australia. Uncommon in the other states.
Plant description:
Tiny prostrate to erect annual herb to 3 cm high. Leaves alternating along the stems to opposite each other, elliptic to oblanceolate or obovate, to 5.5 mm long and 2 mm wide, green sometime with red-mark. Inflorescence in dense clusters at the tops of the stems with white flowers, male and female flowers are of a similar size and occur of the same plant. The flowers have a deeply 3-lobed (rarely 4- or 5-lobed) calyx and 5 shorter inconspicuous petals which are absent on occasions, and male flowers with 3 stamens. This species is similar to Poranthera microphylla which is usually a larger plant and the flowers have 4 calyx segments but the male flowers always have 5 stamens. Flowering between August and November.
Fruit type:
Green-yellow depressed-globular capsule to 1.5 mm across, 3 lobes with 6-seeds.
Seed type:
Brown sectoroid seed to 0.7 mm long and 0.5 mm wide, covered in white tuberculate.
Embryo type:
Spatulate fully developed.
Seed collecting:
Collect individual mature capsules, those that are drying off, fat and contain dark hard seeds or pull out the whole plant (annual) to allow capsules to continue to mature. Green capsules can be collected if the seeds are dark and hard.
Seed cleaning:
Place the capsules in a tray and leave to dry for one to two weeks. Then 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.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
27300 (2.09 g)
27300 (2.09 g)
South Eastern
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.