Seeds of South Australia
Hardenbergia violacea (Leguminosae)
Purple Coral-pea
List of species for Hardenbergia
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Seed collecting:
November to January
Herbarium regions:
Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Mount Gambier (SVP02)Southern Volcanic Plain
 Data Deficient
Bridgewater (NCP01)Naracoorte Coastal Plain
 Near Threatened   [edge of range]
Tintinara (NCP04) 
 Near Threatened
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))
Fleurieu (KAN02) 
 Near Threatened
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Least Concern
Broughton (FLB02) 
 Rare   (IUCN: RA d(ii))
Southern Flinders (FLB04) 
 Rare   (IUCN: RA d(ii))
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern
St Vincent (EYB02) 
 Vulnerable   (IUCN: VU C2a(i))   (Probable Decline)
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(i,ii))
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Murray Lakes and Coorong (MDD03) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [weeds a threat]
IBRA regions
DISPLAY ALL
Mount Gambier (SVP02)Southern Volcanic PlainData Deficient
2 of 4 subregionsNaracoorte Coastal PlainNear Threatened
2 of 2 subregionsKanmantooNear Threatened
, Rare
3 of 6 subregionsFlinders Lofty BlockLeast Concern
, Rare
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
, Vulnerable
2 of 6 subregionsMurray Darling DepressionRare
, Vulnerable
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 Hardenbergia]
Name derivation:
Hardenbergia named after Franziska Countess von Hardenberg, a 19th century Austrian noblewoman, patron of botany and a sister of Baron von Hügel, who collected plants in Western Australia in 1833. Violacea from Latin meaning violet colour; referring to the typical colour of the flower.
Distribution:
Found in the southern part of South Australia, from the Eyre Peninsula to the upper South-east, growing in dryish open-forests and woodlands. Also found in Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Common in South Australia. Very rare in Tasmania. Common in the other states.
Plant description:
Scrambling or trailing perennial shrub with branches that twist around the stems of other plants. Leaves leathery, glabrous, ovate to lanceolate, to 10 cm long, arranged alternately along the stem on stalks to 4 cm long. Inflorescence in axillary clusters with violet (rarely pink and white) pea-flowers. Flowering between July and November.
Fruit type:
Dark brown flattened oblong pod to 50 mm long by 8 mm wide.
Seed type:
Orange reinform seed to 4.2 mm long and 2.2 mm 2wide.
Embryo type:
Bent.
Seed collecting:
Collect mature pods, those turning brown and contain hard seeds inside.
Seed cleaning:
Place the pods in a tray and cover with paper to prevent seeds popping out and leave to dry for a week. Then rub the pods with your hands to dislodge the seeds. Use a sieve to separate the 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 were high, ranging from 90% 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
13823 (188 g)
16125 (215 g)
~1008-Dec-2004DJD 74
Eyre Peninsula
31-Mar-2006100%-18°C
BGA1540 (34.342 g)18-Dec-2005KHB016
Murray
7-Aug-200690%-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
March 2015100%7d7d seed coat nicked
1% water agar
Incubated under winter conditions
March 2015100%7d14d seed coat nicked
1% water agar
Incubated under spring/autumn conditions
March 20154%14dNA None
1% water agar
Incubated under spring/autumn conditions
March 20152%21dNA None
1% water agar
Incubated under winter 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)