Seeds of South Australia
Hakea mitchellii (Proteaceae)
Desert Hakea
List of species for Hakea
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Seed collecting:
January to December
Herbarium regions:
Eyre Peninsula, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Bridgewater (NCP01)Naracoorte Coastal Plain
 Least Concern
Lucindale (NCP03) 
 Least Concern
Tintinara (NCP04) 
 Least Concern
Kangaroo Island (KAN01)Kanmantoo
 Least Concern
Fleurieu (KAN02) 
 Rare   (IUCN: RA d(ii))   [edge of range]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Endangered   (IUCN: EN D)   [in Aldinga Scrub; only in a few locations; may be extinct]
Southern Yorke (EYB01)Eyre Yorke Block
 Vulnerable   (IUCN: VU D2)   [Stansbury scrub]
St Vincent (EYB02) 
 Vulnerable   (IUCN: VU D2)   [not as much suitable habitat]
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
South Olary Plain (MDD01)Murray Darling Depression
 Data Deficient   [outliers - need to check records]
Murray Mallee (MDD02) 
 Near Threatened   (Probable Decline)
Murray Lakes and Coorong (MDD03) 
 Least Concern
Lowan Mallee (MDD04) 
 Least Concern
Wimmera (MDD05) 
 Rare   (IUCN: RA d(ii))   [edge of range]
Gawler Volcanics (GAW02)Gawler
 Rare   (IUCN: RA d(i,ii))
IBRA regions
DISPLAY ALL
3 of 4 subregionsNaracoorte Coastal PlainLeast Concern
2 of 2 subregionsKanmantooLeast Concern
, Rare
Mount Lofty Ranges (FLB01)Flinders Lofty BlockEndangered
  (IUCN: EN D)   [in Aldinga Scrub; only in a few locations; may be extinct]
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Vulnerable
5 of 6 subregionsMurray Darling DepressionLeast Concern
, Near Threatened
, Rare
, Data Deficient
Gawler Volcanics (GAW02)GawlerRare
  (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 Hakea]
Name derivation:
Hakea named after Baron Christian Ludwig von Hake (1745-1818), a German horticulturalist and patron of botany. Mitchellii named after Major Sir Thomas Livingston Mitchell (1792-1855), a surveyor, explorer and botanical collector including the type of the species.
Distribution:
Found in the southern part of South Australia, growing in mallee-heath vegetation on calcareous sandy soil. Also found in Victoria.
Status:
Native. Common in South Australia. Common in Victoria.
Plant description:
Erect rounded shrub to 4 m tall. Leaves uniform or seasonally heteromorphic, subterete to linear and trigonous, rarely obovate-linear, concave, to 120 mm long and 10 mm wide, glabrous, venation not visible in terete leaves, longitudinal veins prominent in trigonous and flat leave. Inflorescence a solitary axillary clusters with 16–36 white to pink flowers. Flowering between October and January.
Fruit type:
Greyish-brown woody ovoid fruit to 25 mm long and 13 mm wide, with a pointy end. Fruit split into two to reveal two seeds.
Seed type:
Brown ovoid seed to 5 mm long and 2 mm wide (12 mm long and 5 mm wide including the wing that extend narrowly down both sides of seed).
Embryo type:
Investing.
Seed collecting:
Collect mature woody fruit that are hard, brown and not split. These will contain seeds.
Seed cleaning:
Place the woody fruit in a tray and leave to dry until it split open. Place the dried fruit in a bucket and shake to dislodge the seeds from the valves. Separate the seeds from the fruit and 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 one collection, the seed viability was high, at 90%.
Seed germination:
Seeds are non-dormant, viable seed should germinate readily without pre-treatment.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
2818
2818
516-Sep-2003PJA 27
Murray
1-Sep-200490%+5°C, -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
Jul-0488%18 d21 d 20% hydrogen peroxide 10 min, water rinse;
1% agar;
14/10;  /  20°C/10°C
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)