Seeds of South Australia
Acacia praemorsa (Leguminosae)
Cassia Wattle
List of species for Acacia
Click on an image to enlarge it
Seed collecting:
October to December
Herbarium region:
Eyre Peninsula
NRM region:
Eyre Peninsula
IBRA region
Eyre Hills (EYB03)Eyre Yorke Block
 Vulnerable   (IUCN: VU B2ab(iii))   (Probable Decline)
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. Praemorsa from the Latin 'praemorsus' meaning as if bitten off​, referring to the praemorse, or truncate leaf tip.
Distribution:
Endemic to South Australia and found on north-eastern Eyre Peninsula between Cleve and Cowell.
Status:
Native. Rare in South Australia.
Plant description:
Shrub to 3 m tall; erect, glabrous, suckering. Leaves linear to 9 cm long and 2.5 mm wide, flattened, slightly to strongly incurved, soft and flexible, 1-veined with a single vein submerged and not readily visible with some longitudinal wrinkling on drying; apex obliquely terminated by brown resinous gland flanked by two minute stipule-like appendages and exceeded by an ecentric incurved, swollen, short, mucro. Flower-spike 1 or rarely 2 reduced racemes per node, with globular, bright lemon-yellow flower-heads. Flowering between October and December.
Fruit type:
Brown, linear, straight or slightly curved, flat or twisted pod to 13 cm long and 8.5 mm wide; glabrous, somewhat raised over the seeds and constricted between them.
Seed type:
Hard, dark black elliptic to ovoid seed to 6.5 mm long and 4 mm wide.
Embryo type:
Investing.
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).