Seeds of South Australia
Choretrum glomeratum (Santalaceae)
Common Sour-bush
List of species for Choretrum
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Seed collecting:
September to January
Herbarium regions:
Eyre Peninsula, Murray, Yorke Peninsula, Kangaroo Island, South Eastern
NRM regions:
Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Bridgewater (NCP01)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(ii))   [limited habitat]
Lucindale (NCP03) 
 Near Threatened
Tintinara (NCP04) 
 Least Concern
Kangaroo Island (KAN01)Kanmantoo
 Least Concern
Fleurieu (KAN02) 
 Rare   (IUCN: RA d(ii))   [well represented; about 3 pops]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Data Deficient   [highly unlikely]
Southern Flinders (FLB04) 
 Rare   (IUCN: RA d(i,ii))
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern
St Vincent (EYB02) 
 Endangered   (IUCN: EN D)   [root parasite]
Eyre Hills (EYB03) 
 Least Concern   [grows in limestone mallee]
Talia (EYB04) 
 Least Concern   [grows in limestone mallee]
Eyre Mallee (EYB05) 
 Least Concern   [grows in limestone mallee]
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Lowan Mallee (MDD04) 
 Rare   (IUCN: RA d(ii))
Wimmera (MDD05) 
 Data Deficient   [inaccurate location]
Maralinga (GVD03)Great Victoria Desert
 Rare   (IUCN: RA d(i,ii))   [isolated popn]
Yellabinna (GVD06) 
 Rare   (IUCN: RA d(i,ii))   [isolated popn]
IBRA regions
DISPLAY ALL
3 of 4 subregionsNaracoorte Coastal PlainLeast Concern
, Near Threatened
, Rare
2 of 2 subregionsKanmantooLeast Concern
, Rare
2 of 6 subregionsFlinders Lofty BlockRare
, Data Deficient
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Endangered
3 of 6 subregionsMurray Darling DepressionRare
, Data Deficient
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 from the flower itself. Glomeratum from the Latin 'glomeratus' meaning to gather into a ball.
Distribution:
Found in  southern  South Australia from the west coast of Eyre Peninsula to the upper South-east growing semi-parasitically in woodland and mallee communities on sandy red soils. Also found Western Australia, New South Wales and Victoria.
Status:
Native. Uncommon in South Australia. Uncommon in the other States.
Plant description:
An erect or straggly semi-parastic perennial, yellow-green shrub to 2 m high. Leaves subulate to 1 mm long; appressed to slightly spreading, caducous. Inflorescence a raceme to 5 mm long bearing 2-5 small flowers but only one fruit. Flowers enclosed by 3 brown or white bracts, perianth white 1-1.5cm long. Flowering throughout the year.
Fruit type:
Pale green ellipsoid to globular freshy drupes to 5 mm long.
Seed type:
Hard brown spherical seeds to 5mm, with ridges running from end to end.
Embryo type:
Linear underdeveloped.
Seed collecting:
Collect drupes that are maturing; the skin softens as it ripens. Either collect the drupes from the bush or  easier to collect ripe fruits that have fallen off the plant onto 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 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 fours collections, the seed viability wase average to high, ranging from 55% to 100%.
Seed germination:
This species is generally difficult to germinate, it has morphophysiological dormancy and complex germination requirements.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
2376 (110.1 g)
1480 (43.6 g)
100+24-Sep-2005DJD145
Southern Lofty
8-Aug-2006100%-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.