Seeds of South Australia
Gyrostemon australasicus (Gyrostemonaceae)
False Buckbush
List of species for Gyrostemon
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Seed collecting:
September to December
Herbarium regions:
Flinders Ranges, 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 Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
Lucindale (NCP03)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(ii))   [needs sand & fire]
Tintinara (NCP04) 
 Least Concern   [needs sand & fire]
Kangaroo Island (KAN01)Kanmantoo
 Least Concern   [undercollected]
Fleurieu (KAN02) 
 Rare   (IUCN: RA d(ii))   [limited habitat; Newland Head, Cox Scrub - strongholds, Monarto]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [likes sandy areas; needs fire; limited habitat]
Central Flinders (FLB06) 
 Rare   (IUCN: RA d(i,ii))   [outlier; needs fire]
Southern Yorke (EYB01)Eyre Yorke Block
 Vulnerable   (IUCN: VU C2a(i))   (Probable Decline)
St Vincent (EYB02) 
 Critically Endangered   (IUCN: CR D)   [Possibly extinct]
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Rare   (IUCN: RA d(ii))   [edge of range]
Eyre Mallee (EYB05) 
 Least Concern
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i))   [fire dependent]
Murray Lakes and Coorong (MDD03) 
 Rare   (IUCN: RA d(ii))   [needs sand & fire]
Lowan Mallee (MDD04) 
 Least Concern   [fire dependent]
Wimmera (MDD05) 
 Rare   (IUCN: RA d(i,ii))   [needs sand & fire; edge of range]
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(i,ii))   [Bob C - could occur here]
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(ii))   [edge of range]
Yellabinna (GVD06)Great Victoria Desert
 Rare   (IUCN: RA d(ii))   [edge of range]
IBRA regions
2 of 4 subregionsNaracoorte Coastal PlainLeast Concern
, Rare
2 of 2 subregionsKanmantooLeast Concern
, Rare
2 of 6 subregionsFlinders Lofty BlockRare
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
, Vulnerable
, Critically Endangered
4 of 6 subregionsMurray Darling DepressionLeast Concern
, Rare
Murray Scroll Belt (RIV06)RiverinaRare
  (IUCN: RA d(i,ii))   [Bob C - could occur here]
Myall Plains (GAW01)GawlerRare
  (IUCN: RA d(ii))   [edge of range]
Yellabinna (GVD06)Great Victoria DesertRare
  (IUCN: RA d(ii))   [edge of range]
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 Gyrostemon]
Name derivation:
Gyrostemon from the Greek 'gyros' meaning a circle and 'stemon' meaning a stamen; alluding to the whorled stamens. Australasicus means of or from Australasia; referring to the species distribution. 
Found in the southern part of South Australia, growing on sand in heath and mallee shrublands. Also found in New South Wales and Victoria.
Native. Uncommon in South Australia. Uncommon in the other states. More common in the first few years following fire.
Plant description:
Short lived erect shrub to 1 m high, dioecious. Leaves narrowly linear-terete, sometimes broader above, often grooved, to 50 mm long and 1.5 mm wide, stipules triangular. All flowers with calyx to 1 mm long, pedicels to 2 mm long, recurved. Male flower calyces shallowly and broadly lobed, stamens 9–14. Female flower calyces with ovate-triangular, acute lobes, carpels 4–7, stigmas to 4 mm long, finely rugose. Flowering between July and December.
Fruit type:
Reddish fruit to 5 mm diameter, fleshy with multiple segments.
Seed type:
Dark brown to black reniform seeds to 2 mm long and 1.5 mm wide, with a rugose surface and a yellowish aril
Embryo type:
Curved linear fully developed.
Seed collecting:
Collect fruits that are fat, turning reddish or starting to dry and fall off easily.
Seed cleaning:
Place the fruits in a tray and leave to dry for a week. Then rub the fruit gently by hand to dislodge the seeds from the papery wing. 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 average, at 75%.
Seed germination:
This species is generally difficult to germinate, it has morphophysiological dormancy and complex germination requirements. This species is considered a fire responsive species.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
16500 (18.05 g)
10500 (11.56 g)
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.