Seeds of South Australia
Acacia merrallii (Leguminosae)
Merrall's Wattle
List of species for Acacia
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Seed collecting:
November to January
Herbarium regions:
Nullarbor, Eyre Peninsula, Yorke Peninsula
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, Northern and Yorke
IBRA regions
St Vincent (EYB02)Eyre Yorke Block
 Critically Endangered   (IUCN: CR D)   (Definite Decline)   [seen on roadsides by Dan Duval]
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
Myall Plains (GAW01)Gawler
 Least Concern
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(i,ii))
Yellabinna (GVD06)Great Victoria Desert
 Least Concern
Nullarbor Plain (NUL02)Nullarbor
 Rare   (IUCN: RA d(i,ii))
Yalata (NUL03) 
 Rare   (IUCN: RA d(i,ii))
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 Acacia]
Name derivation:
Acacia from the Greek 'akakia' and derived from 'ake' or 'akis' meaning a sharp point or thorn and 'akazo' meaning to sharpen. Dioscorides, the Greek physician and botanist used the word in the 1st century AD for the Egyptian thorn tree, Acacia arabica. Merrallii named in honour of Edwin Merrall (1844-1913), a botanical collector in Victoria and Western Australia.
Found in or near coastal areas in the Nullarbor region, eastwards across Eyre Peninsula, with a small occurrence on Yorke Peninsula; mainly in open scrub vegetation associated with Eucalyptus socialis and E. gracilis, in brown calcareous soils and grey-brown calcareous loams. Also found in Western Australia.
Native. Common in South Australia. Common in Western Australia.
Plant description:
Small, rigid, spreading, procumbent shrubs to 1.5 m high and usually wider than its height. Branches hoary-pubescent slightly angular greyish-brown with grey bark. Phyllodes obliquely ovate-orbicular or obovate to 20 mm long and 15 mm wide;  flat, rigid, grey-green, hoary-pubescent when young. Inflorescences simple and axillary, solitary or twin with globular, yellow flower-heads. Flowering between August and October.
Fruit type:
Dark brown linear but curved or loosely coiled pod to 60 mm long and 3 mm wide with margins slightly contracted between seeds.
Seed type:
Hard, dark brown to black semi-flat seed to 3 mm long and 2 mm wide with a large fleshy bright-yellow conical aril which is at least half the size of the seed and often broader.
Embryo type:
Seed collecting:
Collect mature pods that are turning brown, with hard, dark seeds inside.
Seed cleaning:
Place the pods in a tray and leave to dry for 1-2 weeks or until the pods begin to split. Then rub the dried pods to dislodge the seeds. Use a sieve to separate any 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 germination:
This species has physical dormancy that needs to be overcome for the seed to germinate (e.g. nicking or softening the seed coat).