Seeds of South Australia
Lawrencia berthae (Malvaceae)
Showy Lawrencia
List of species for Lawrencia
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Seed collecting:
September to November
Herbarium regions:
Eyre Peninsula, Murray
NRM regions:
Eyre Peninsula, South Australian Murray-Darling Basin
IBRA regions
Southern Yorke (EYB01)Eyre Yorke Block
 Regionally Extinct   [Tepper record, probably SY]
Eyre Hills (EYB03) 
 Rare   (IUCN: RA d(ii))
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
South Olary Plain (MDD01)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [comes up after fire]
Murray Mallee (MDD02) 
 Rare   (IUCN: RA d(i,ii))   [comes up after fire]
Murray Scroll Belt (RIV06)Riverina
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [comes up after fire]
Myall Plains (GAW01)Gawler
 Rare   (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 Lawrencia]
Name derivation:
Lawrencia named after Robert Williams Lawrence (1807-33), an English-born botanist and plant collector in Tasmania. Berthae named after Bertha Doughty (1827-1896), sister of Ferdinand von Mueller.
Distribution:
Found on the Eyre Peninsula and in the Murray region in South Australia, growing on clay, sandy clay and sand. Also found in Western Australia and Victoria.
Status:
Native. Rare in South Australia. Very rare in Victoria. Uncommon in Western Australia.
Plant description:
Small greyish-green dioecious sub-shrub to 80 cm high, with many slender hairy herbaceous branches. Leaves elliptic to obovate-cuneate, to 20 mm long and 8 mm wide, V-shaped in section, margins crenate to shallowly lobed, both surfaces densely hairy. Inflorescence solitary or in small clusters in the axils of leaves with large white flowers. Flowering between July to October.
Fruit type:
Hairy brown ovoid fruit to 2 mm high and 6 mm diameter, consisting of a number of seed segments.
Seed type:
Dark brown to black  wedge-shaped seed to 2 mm long and 1 mm wide, covered with coarse hairs on the outer surface.
Embryo type:
Folded.
Seed collecting:
Collect mature fruits, those that are turning a brown colour and the segments contain dark hard seeds.
Seed cleaning:
Place the fruits in a tray and leave to dry for one to two weeks. Then rub the fruits gently by hand to separate the  seed segments. 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 average, at 76%.
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 table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jun-120%NANA seed coat nicked with scalpel;
1% 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)