Seeds of South Australia
Choretrum chrysanthum (Santalaceae)
Yellow Sour-bush
List of species for Choretrum
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Seed collecting:
December to April
Herbarium regions:
North Western, Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Tintinara (NCP04)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D1+2)
Fleurieu (KAN02)Kanmantoo
 Data Deficient   [Kinchina record on loan, unable to verify]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Endangered   (IUCN: EN D)   [(no records) records on loan, P Lang verified; small pops, Willaston Cemetary/Nuriootpa]
Broughton (FLB02) 
 Endangered   (IUCN: EN D)
Southern Flinders (FLB04) 
 Rare   (IUCN: RA d(i,ii))
Southern Yorke (EYB01)Eyre Yorke Block
 Vulnerable   (IUCN: VU D2)   [heavy soils]
St Vincent (EYB02) 
 Endangered   (IUCN: EN D)
Eyre Hills (EYB03) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
South Olary Plain (MDD01)Murray Darling Depression
 Data Deficient   [possibly extinct]
Murray Mallee (MDD02) 
 Regionally Extinct   [possibly extinct]
Lowan Mallee (MDD04) 
 Vulnerable   (IUCN: VU D1+2)
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Maralinga (GVD03)Great Victoria Desert
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Yellabinna (GVD06) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
IBRA regions
DISPLAY ALL
Tintinara (NCP04)Naracoorte Coastal PlainVulnerable
  (IUCN: VU D1+2)
Fleurieu (KAN02)KanmantooData Deficient
  [Kinchina record on loan, unable to verify]
3 of 6 subregionsFlinders Lofty BlockRare
, Endangered
4 of 5 subregionsEyre Yorke BlockRare
, Vulnerable
, Endangered
3 of 6 subregionsMurray Darling DepressionVulnerable
, Regionally Extinct
, Data Deficient
Myall Plains (GAW01)GawlerRare
  (IUCN: RA d(ii))   (Probable Decline)
2 of 4 subregionsGreat Victoria DesertRare
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 Choretrum]
Name derivation:
Choretrum from the Greek 'choris' meaning separate and 'etron' meaning abdomen; referring to a rim that separates the top of the flower stalk to the flower itself. Chrysanthum from the Greek 'chrysos' meaning golden and 'anthos' meaning flower.
Distribution:
Found in the southern part of South Australia from the west coast to the lower South-east. Also found in Western Australia and Victoria.
Status:
Native. Common in South Australia. Rare in Victoria. Uncommon in Western Australia.
Plant description:
An erect semi-parastic, many stemmed perennial shrub to 3 m high, branches more or less erect, slender, rigid or flexible, angular or ridged. Leaves narrow-deltoid, triquetrous, to 1.5 mm long, the tips and eventually the whole leaf often caducous. Inflorescence yellowish, 1-4 mm long, bearing 2-5 flowers but only 1 fruit. Flowers enclosed at the base by 3 brown or whitish ciliate or fimbriate bracts; perianth yellow (brownish when dry), 1-1.5 mm long. Flowering throughout the year.
Fruit type:
Green ovoid or almost globular flesh drupe to 6 mm long.
Seed type:
Hard brown spherical seeds to 6 mm, with ridges running from end to end.
Embryo type:
Linear underdeveloped.
Seed collecting:
Collect drupes that are maturing, the skin is softens as it ripens. Either collect the drupes from the bushed or the easiest method is to collect ripe fruits that have fallen off the plant on the ground beneath the bushes.
Seed cleaning:
Place the drupes in a bucket of water and rub the flesh off with your hands. Drain the water and wash again if required to remove all the flesh. Then spread the wet seeds on some paper towel and leave to dry. 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 low, at 19%. Seeds collected off the bushes tend to be less viable than those collected from the ground.
Seed germination:
This species is generally difficult to germinate, it has morphophysiological dormancy and complex germination requirements.