Seeds of South Australia
Zoysia macrantha ssp. walshii (Gramineae)
Walsh's Couch
List of species for Zoysia
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Seed collecting:
January to June
Herbarium regions:
Eyre Peninsula, Kangaroo Island, South Eastern
NRM regions:
Eyre Peninsula, Kangaroo Island, South East
IBRA regions
Bridgewater (NCP01)Naracoorte Coastal Plain
 Near Threatened
Lucindale (NCP03) 
 Rare   (IUCN: RA d(ii))   [edge of range]
Kangaroo Island (KAN01)Kanmantoo
 Near Threatened   [likes wet, salty ground]
Eyre Hills (EYB03)Eyre Yorke Block
 Regionally Extinct   [probably extinct]
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 Zoysia]
Name derivation:
Zoysia named after Karl von Zoys (Zois) (1756–1800), an Austrian botanist and and plant collector. Macrantha from the Greek 'macros' meaning large and 'anthos' meaning flower; alluding to the large spikelets. Walshii named after Neville Walsh (1956-), Senior Conservation Botanist at the Royal Botanic Gardens Victoria who helped to elucidate this taxon and distinguish it from Zoysia matrella.
Distribution:
Found on the lower Eyre Peninsula, Kangaroo Island and the South-east in South Australia, growing on black soil over clay around the edges of coastal saltmarsh and fringing salt lakes. Also found in Victoria and Tasmania.
Status:
Native. Uncommon in South Australia. Rare in Victoria. Common in Tasmania.
Plant description:
Perennial grass with deeply buried rhizomes, culms and leaves on erect stems to 10 cm high. Leaves glabrous, blade to 10 cm long and 1.5 mm wide, often inrolled when young, rigid, often sharp-pointed. Inflorescence a spike-like raceme with spikelets to 3 mm long, glume shining, often blackish. Flowering between November and April.
Fruit type:
Small short spike.
Embryo type:
Lateral.
Seed collecting:
Use hands to gently strip seeds off the mature seed spike that are turning straw colour. Mature seeds will come off easily. Alternatively, you can break off the whole seed spike.
Seed cleaning:
Place the seeds/spike in a tray and leave to dry for two weeks. No further cleaning is required if only seed collected. If seed spikes collected, use hand to strip off the mature 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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jul-170%NANA 500 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under spring/autumn conditions
Jul-170%NANA 500 mg/L gibberellic acid for 24 h;
1% 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)