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
SUMMARY
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
DISPLAY ALL
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. 
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.
Status:
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)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
16500 (18.05 g)
10500 (11.56 g)
13-Nov-2006DJD662
Kangaroo Island
1-Aug-200775%-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.