Seeds of South Australia
Acacia rhigiophylla (Leguminosae)
Dagger-leaf Wattle
List of species for Acacia
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Seed collecting:
November to December
Herbarium regions:
Eyre Peninsula, Murray
NRM regions:
Eyre Peninsula, South Australian Murray-Darling Basin
IBRA regions
Fleurieu (KAN02)Kanmantoo
 Vulnerable   (IUCN: VU D2)   [restricted habitat - granite soils]
Olary Spur (FLB03)Flinders Lofty Block
 Critically Endangered   (IUCN: CR D)   (Definite Decline)   [Disjunct pop. Very few plants left. David Symon collected.]
Eyre Hills (EYB03)Eyre Yorke Block
 Vulnerable   (IUCN: VU C1+2a(i))   (Probable Decline)
Talia (EYB04) 
 Vulnerable   (IUCN: VU C1+2a(i))   (Probable Decline)
Eyre Mallee (EYB05) 
 Vulnerable   (IUCN: VU C1+2a(i))   (Probable Decline)
Murray Mallee (MDD02)Murray Darling Depression
 Critically Endangered   (IUCN: CR C2a(i))   (Probable Decline)   [highly localised in granites]
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. Rhigophylla from the Greek 'rhigelos' meaning rigid and 'phyllon' meaning a leaf, referring to the stiff unbending needle-like phyllodes.
Distribution:
Small occurrence on Eyre Peninsula and Murray region in open scrub associated with Eucalyptus socialis and E. gracilis, in hard alkaline red duplex or grey-brown calcareous loam soil. Also found in New South Wales.
Status:
Native. Locally common but rare in South Australia. Rare in New South Wales.
Plant description:
Rigid, prickly, spreading, intricately branched, dark green shrubs to 3 m high and usually wider than high. Branches terete, reddish-brown, which are slightly roughened and flaky at the base of stems and slightly pubescent with brown bark  Leaves linear-lanceolate to 2.5 cm long and 2 mm wide; flat, rigid, sessile, divaricate, striate; glabrous with 2-3 prominent raised longitudinal veins and apex tapering into a reddish-brown pungent point. Flower-heads cylindrical to almost globular, bright yellow. Flowering between September and October.
Fruit type:
Long, much curved brown pod to 8 cm long and 3 mm wide.
Seed type:
Dark brown to black, elliptical seeds to 5 mm long and 2 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
BGA 
MSB
9100 (42.81 g)
9100 (42.81 g)
15-Dec-2005PJA113
Murray
1-Aug-2006100%-18°C
BGA 
MSB
2520 (12.4 g)
2520 (12.4 g)
6-Dec-2005TEE004
Eyre Peninsula
1-Aug-200695%-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.