Seeds of South Australia
Mentha australis (Labiatae)
River Mint
List of species for Mentha
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Seed collecting:
December to April
Herbarium regions:
Lake Eyre, Gairdner-Torrens, Flinders Ranges, Eastern, Murray, Southern Lofty
NRM regions:
Adelaide and Mount Lofty Ranges, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
SUMMARY
Fleurieu (KAN02)Kanmantoo
 Vulnerable   (IUCN: VU B2ab(iii); D2)   (Probable Decline)   [in Finniss R & Myponga - declined from Myponga; grazing, habitat degraded]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Vulnerable   (IUCN: VU B2ab(iii); D2)   (Probable Decline)   [changed hydrology a threat; needs fresh water; lives in redgum woodlands]
Broughton (FLB02) 
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)
Southern Flinders (FLB04) 
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)
Northern Flinders (FLB05) 
 Rare   (IUCN: RA d(ii))
Murray Mallee (MDD02)Murray Darling Depression
 Vulnerable   (IUCN: VU D2)   (Probable Decline)   [restricted to river]
Murray Lakes and Coorong (MDD03) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Arcoona Plateau (GAW04)Gawler
 Rare   (IUCN: RA d(i,ii))
Torrens (GAW06) 
 Rare   (IUCN: RA d(ii))
Warriner (SSD04)Simpson Strzelecki Dunefields
 Rare   (IUCN: RA d(ii))
Strzelecki Desert (SSD05) 
 Rare   (IUCN: RA d(ii))
Breakaways (STP01)Stony Plains
 Rare   (IUCN: RA d(ii))
Oodnadatta (STP02) 
 Least Concern
Murnpeowie (STP03) 
 Near Threatened
Macumba (STP05) 
 Near Threatened
Witjira (STP06) 
 Near Threatened
Baltana (STP07) 
 Near Threatened
Sturt Stony Desert (CHC02)Channel Country
 Rare   (IUCN: RA d(ii))
Diamantina-Eyre (CHC04) 
 Near Threatened
Coongie (CHC06) 
 Least Concern
Lake Pure (CHC07) 
 Rare   (IUCN: RA d(ii))
IBRA regions
DISPLAY ALL
Fleurieu (KAN02)KanmantooVulnerable
  (IUCN: VU B2ab(iii); D2)   (Probable Decline)   [in Finniss R & Myponga - declined from Myponga; grazing, habitat degraded]
4 of 6 subregionsFlinders Lofty BlockRare
, Vulnerable
, Endangered
2 of 6 subregionsMurray Darling DepressionVulnerable
Murray Scroll Belt (RIV06)RiverinaRare
  (IUCN: RA d(ii))   (Probable Decline)
2 of 8 subregionsGawlerRare
2 of 4 subregionsSimpson Strzelecki DunefieldsRare
6 of 7 subregionsStony PlainsLeast Concern
, Near Threatened
, Rare
4 of 4 subregionsChannel CountryLeast Concern
, Near Threatened
, Rare
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 Mentha]
Name derivation:
Mentha a Latin name of a Greek nymph who was turned into a mint plant. Australis means of or from the south, or Australia.
Distribution:
Found in the eastern side of South Australia, south to the Murray River, growing on clay-rich soils, particularly near rivers and creeks, or in clay depressions in the floodplains of the River Murray. Also found in all states except in Western Australia.
Status:
Native. Common in South Australia. Uncommon in the Northern Territory and Tasmania. Common in the other states.
Plant description:
Soft perrenial herb, often sprawling, sometimes erect. Leaves ovate often angular-ovate or lanceolate, paired, to 20 mm long and 12 mm wide, glabrous or with short hairs. Inflorescence in dense clusters with 3-12 tubular, white or pink flowers in the leaf axils. Flowering between November and February.
Fruit type:
Dense clusters of papery brown capsules.
Seed type:
Dark brown to black ovoid seed to 1 mm long and 0.7 mm wide.
Embryo type:
Spatulate.
Seed collecting:
Collect individual capsules that are turning brown and contain hard seeds or break off whole stems with numerous brown capsules.
Seed cleaning:
Place the capsules in a tray and leave to dry for a week. Then rub the capsules gently with a rubber bung to dislodge the seeds from the capsules. Use a sieve to separate the unwanted material. Some seeds will be empty.  Use an aspirator to siphon off the lighter, non-viable seeds from the heavier good seeds. 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 80% to 85%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA910 (0.13 g)24-Feb-2009TST717
Southern Lofty
20-Jul-200980%-18°C
BGA12000 (1.61 g)50+8-Dec-2013DJD2660
Murray
27-Feb-201485%-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-1384%7 d7 d 250 mg/L gibberellic acid 48 h;
1% agar;
12/12;  /  20°C
Jun-130%NANA
1% agar;
12/12;  /  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)