Seeds of South Australia
Melaleuca gibbosa (Myrtaceae)
Slender Honey-myrtle
List of species for Melaleuca
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Seed collecting:
January to December
Herbarium regions:
Eyre Peninsula, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Vulnerable   (IUCN: VU D1+2)
Bridgewater (NCP01)Naracoorte Coastal Plain
 Near Threatened
Glenelg Plain (NCP02) 
 Rare   (IUCN: RA d(ii))   [grows in swamps]
Lucindale (NCP03) 
 Least Concern   [stronghold ]
Tintinara (NCP04) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [edge of range; habitat drying a threat]
Kangaroo Island (KAN01)Kanmantoo
 Least Concern   [widespread]
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern   [coastal limestone]
Eyre Hills (EYB03) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Talia (EYB04) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [sensitive to salinity & drying]
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Lowan Mallee (MDD04)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [easy to confuse with M decussata]
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 Melaleuca]
Name derivation:
Melaleuca from the Greek 'melas' meaning black and 'leucon' meaning white; alluding to the contrasting colours of the bark of the first species described, which is said to have had white branches against a black trunk. Gibbosa from the Latin 'gibbosus' meaning having a hump; referring to the hump when the fruit become embeded in the woodty stem.
Distribution:
Found mainly on the southern Yorke Peninsula, Kangaroo Island and the South-east in South Australia with a few scattered records on the southern Eyre Peninsula and the Fleurieu Peninsula, growing in heath scrub in swampy areas. Also found in Victoria and Tasmania.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Medium-sized shrub to 2 m high and 2 m wide. Leaves ovate to obovate, to 7 mm long and 4 mm wide, sessile and arranged in crowded, alternating, opposite pairs along the stem. Inflorescence a dense cylindrical spike to 5 mm wide with about ten pairs of mauve flowers. Flowering between November and December.
Fruit type:
Grey-brown woody capsule to 5 mm wide but wider at the base where they become embedded in the woody stem.
Seed type:
Tiny brown cylindrical seed to 1.2 mm long and 04 mm wide.
Embryo type:
Folded.
Seed collecting:
Collect capsules that are large and hard with closed valves.
Seed cleaning:
Place the capsules in a tray and leave to dry for at least two weeks or until all the valves are open. Then place all the capsules into a bucket with a lid if possible and shake hard to dislodge the seeds from the capsules. Use a sieve to separate the seeds from the capsules. The fine material will contain the seeds and other flowering material. It is very difficult to separate the seeds from this other material as the size, shape and weight are very similar. However the seeds will be a darker brown. 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%.
Seed germination:
Seeds are non-dormant, viable seed should germinate readily.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
103125
103125
1019-Feb-2003PJA 41
Kangaroo Island
1-Sep-2004100%+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
Jun-0483%15 d35 d 20% hydrogen peroxide 10 min, water rinse;
1% agar;
8/16;  /  20°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)