Seeds of South Australia
Acacia spilleriana (Leguminosae)
Round-leaf Mulga
List of species for Acacia
Click on an image to enlarge it
Seed collecting:
September to December
Herbarium regions:
Northern Lofty, Murray
NRM regions:
Northern and Yorke, South Australian Murray-Darling Basin
IBRA regions
Broughton (FLB02)Flinders Lofty Block
 Endangered   (IUCN: EN A2ac; C1)   (Definite Decline)   [Hopkins Ck CP, ~100 plants left. Extinct towards Tanunda. On roadsides, in Burra Hills, Hallaleuga Hills. Needs more survey work. Taxonomic issues.]
St Vincent (EYB02)Eyre Yorke Block
 Endangered   (IUCN: EN A2ace; C1)   (Definite Decline)   [Only remnant roadside plants left. Potential to hybridise out. ]
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. Spilleriana named after E. Spiller, an early Government Printer in South Australia.
Distribution:
Endemic to South Australia and is restricted to northern Mount Lofty Ranges between Tarlee and Burra, growing in open mallee communities on low hills on calcareous soils.
Status:
Native. Locally common but rare in South Australia.
Plant description:
Bushy, compact, rounded, spreading, grey-green shrub to 3 m tall with smooth bark and densely hoary, pubescent branchlets. Leaves elliptic to oblong-elliptic less often to obovate; slightly asymmetric with a rounded apex to 3 cm long and 1.8 cm wide, firm, grey-green. New shoots sometimes silvery, marginal and main vein prominent, lateral veins obscure. Inflorescence of few globular heads from a short common peduncle with bright yellow flower-heads. Flowering between August and September.
Fruit type:
Firm, glabrous, dark grey pod to 5.5c m long and 1.8 cm wide, often with only 1-2 seeds, margin not constricted between the seed.
Seed type:
Hard, black, ellipsoid to ovoid seed to 6 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 viability:
From two collections, the seed viability was high, ranging from 95% to 100%.
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).
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA1200 (30.56 g)~3028-Nov-2005Hallelujah Hills
Flinders Ranges
9-Aug-2006100%-18°C
BGA 
MSB
8310 (249.3 g)
9400 (282.87 g)
60-701-Dec-2006KHB65
Northern Lofty
1-Aug-200795%-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.