Seeds of South Australia
Gunniopsis calcarea (Aizoaceae)
Yellow-flowered Pigface
List of species for Gunniopsis
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Seed collecting:
January to December
Herbarium regions:
Nullarbor, Flinders Ranges
NRM regions:
Alinytjara Wilurara, South Australian Arid Lands
IBRA regions
Northern Flinders (FLB05)Flinders Lofty Block
 Vulnerable   (IUCN: VU D2)   [outlier; Nullarbor sp.]
Nullarbor Plain (NUL02)Nullarbor
 Near Threatened
Yalata (NUL03) 
 Rare   (IUCN: RA d(ii))
Hampton (HAM01)Hampton
 Least Concern
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 Gunniopsis]
Name derivation:
Gunniopsis from the genus Gunnia named after Ronald Campbell Gunn (1808-1881), a Tasmania botanist and from the Greek 'opsis' meaning resembling; alluding to the resembles of the genus to the genus GunniaCalcarea from the Latin 'cakareus' meaning limestone; alluding to the restriction of this species to the Nullarbor Plain on skeletal calcareous soils.
Distribution:
Found in the far west in South Australia along the Great Australian Bight, growing on skeletal calcareous brown earths, especially in shallow depressions with Halosarcia and Maireana species and in open places in low mallee-Melaleuca scrubland. Also found in Western Australia.
Status:
Native. Rare in South Australia. Uncommon in Western Australia.
Plant description:
Small branching perennial shrub to 20 cm high, covered with shiled-like scales. Leaves lanceolate, bright-green, to 30 mm long and 4 mm wide. Flowers solitary, bright yellow. Flowering possible all year depending on rainfall.
Fruit type:
Brown capsule to 6.5 mm long, with two valves.
Seed type:
Small dark brown to black reniform seed to 1 mm long, covered with round tubercules.
Embryo type:
Peripheral.
Seed collecting:
Pick mature capsules when they turn a straw colour and contain hard dark seeds.
Seed cleaning:
Place the capsules in a tray and leave to dry for at least a week. Then rub the dried capsules 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 one collection, the seed viability was high, at 100%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
4000 (1.22 g)
4000 (1.22 g)
50-604-Nov-2009MJT242
Nullarbor
Jun-2010100%-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 201036%7dNA None
1% water agar supplemented with 250mg/L GA3 (pH adjusted to 6.5).
Incubated under spring/autumn conditions
April 201034%7dNA None.
1% water agar supplemented with 250mg/L GA3 (pH adjusted to 6.5).
Incubated under winter conditions
April 20106%14dNA None.
1% water agar supplemented with 100mg/L KNO3.
Incubated under spring/autumn conditions
April 20104%21dNA None.
1% water agar.
Incubated under spring/autumn conditions
April 20100%NANA None.
1% water agar.
Incubated under winter conditions
April 20100%NANA None.
1% water agar supplemented with 100mg/L KNO3.
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)