Seeds of South Australia
Acacia lineata (Leguminosae)
Streaked Wattle
List of species for Acacia
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Seed collecting:
November to December
Herbarium regions:
Eyre Peninsula, Murray, Yorke Peninsula, South Eastern
NRM regions:
Eyre Peninsula, South Australian Murray-Darling Basin, South East
IBRA regions
Tintinara (NCP04)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)   [edge of range, lack of info, highly localised]
Southern Yorke (EYB01)Eyre Yorke Block
 Rare   (IUCN: RA d(i,ii))   [scattered along roadsides. In one spot. DD Possibly EN]
St Vincent (EYB02) 
 Rare   (IUCN: RA d(i,ii))   [needs more survey work - possibly endangered]
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(i,ii))
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA a)   (Probable Decline)   [stronghold in this area; likes depressions, saline areas]
Lowan Mallee (MDD04) 
 Rare   (IUCN: RA d(ii))   [outlier]
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [edge of range]
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. Lineata from the Latin 'lineata' meaning streaked, marked with lines, referring to the parallel veins on the phyllodes.
Distribution:
A small local occurrence on northern Yorke Peninsula but the main occurrence is in the Murray region. Grows in open scrub vegetation associated with Eucalyptus socialis and E. gracilis on brown calcareous soils. Also found in Queensland, New South Wales and Victoria.
Status:
Native. Rare in South Australia. Common in the other States.
Plant description:
Bushy, spreading, green or greenish-yellow shrubs to 1.75 m high and often the same or more across. Leaves narrow-linear to 15 mm long and 3 mm wide; erect, thick, sparsely pubescent, attenuated at the base, with a resinous vein close to and parallel with lower margin; apex acute; glands small, 1-2 mm from base. Inflorescences simple and axillary, solitary or twin with  globular, yellow flower-heads.  Flowering in August to October.
Fruit type:
Curved and twisted pod to 3 cm long and 3 mm wide, flattish but raised over the seeds; somewhat resinous with slightly thickened, yellowish margins .
Seed type:
Hard, dark brown to black, oblong to elliptic seeds to 4 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 86% to 95%.
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). Germination 86%, seed scarified (chipped with scalpel), on 0.7% w/v agar, 12/12 dark/light, 20°C. See http://data.kew.org/sid.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA700 (5.5 g)60-709-Dec-2009MJT252
Murray
Jun-201095%-18°C
BGA5340 (63.04 g)12-Dec-2012DJD2423
Eyre Peninsula
27-Feb-2014 (Xray 86%)-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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
April 2010100%14d14d Seed coat nicked
70mm glass petri dishes 1% w/v agar
Incubated under winter conditions
April 201098%7d14d Seed coat nicked
70mm glass petri dishes 1% w/v agar
12/12 dark/light  /  20C constant
April 201098%14d21d Seed coat nicked
70mm glass petri dishes on 1% w/v agar
Incubated under spring/autumn conditions
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)