Seeds of South Australia
Gahnia lanigera (Cyperaceae)
Desert Saw-sedge
List of species for Gahnia
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Seed collecting:
November to March
Herbarium regions:
Nullarbor, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Bridgewater (NCP01)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Lucindale (NCP03) 
 Near Threatened
Tintinara (NCP04) 
 Least Concern
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))   [limestone sp ]
Fleurieu (KAN02) 
 Least Concern   [limestone sp ]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [urbanisation, weeds - threats]
Broughton (FLB02) 
 Least Concern   (Probable Decline)
Southern Flinders (FLB04) 
 Rare   (IUCN: RA ab)   (Definite Decline)
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern   (Probable Decline)
St Vincent (EYB02) 
 Least Concern   (Probable Decline)
Eyre Hills (EYB03) 
 Least Concern   [survive in cleared paddocks, tolerate grazing]
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
South Olary Plain (MDD01)Murray Darling Depression
 Near Threatened   [uncommon]
Murray Mallee (MDD02) 
 Least Concern
Murray Lakes and Coorong (MDD03) 
 Near Threatened   [limestone spp]
Lowan Mallee (MDD04) 
 Least Concern
Myall Plains (GAW01)Gawler
 Least Concern
Gawler Volcanics (GAW02) 
 Least Concern
Yellabinna (GVD06)Great Victoria Desert
 Least Concern
Yalata (NUL03)Nullarbor
 Least Concern
IBRA regions
DISPLAY ALL
3 of 4 subregionsNaracoorte Coastal PlainLeast Concern
, Near Threatened
, Rare
2 of 2 subregionsKanmantooLeast Concern
, Rare
3 of 6 subregionsFlinders Lofty BlockLeast Concern
, Rare
5 of 5 subregionsEyre Yorke BlockLeast Concern
4 of 6 subregionsMurray Darling DepressionLeast Concern
, Near Threatened
2 of 8 subregionsGawlerLeast Concern
Yellabinna (GVD06)Great Victoria DesertLeast Concern
Yalata (NUL03)NullarborLeast 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 Gahnia]
Name derivation:
Gahnia named after Dr. Henricus Gahn, 19th century Swedish botanist and student of Linnaeus. Lanigera from Latin meaning woolly; referring to the woolly ligules.
Distribution:
Found in the southern part of South Australia, sandy soils in mallee and heathland. Also found in New South Wales and Vioctoria.
Status:
Native. Common in South Australia. Uncommon in New South Wales. Common in Victoria.
Plant description:
Tufted perennial sedge with slender culms to 30 cm high and 1 mm diameter. Leaves filiform, channelled, erect, pungent, smooth, longer than culm, shorter than or equalling inflorescence, ligule woolly. Inflorescence slender, erect, to 20 cm long, with 2–5 nodes. Flowers in spring and summer.
Fruit type:
Dark brown to black narrow dense spike.
Seed type:
Dark brown to black three-sided ovoid seed to 1.5 mm long and 1 mm wide, with fine tuberculated surface.
Embryo type:
Capitate.
Seed collecting:
Collect heads that are dying off, turning dark brown and containing hard dark seeds.
Seed cleaning:
Place the heads in a tray and leave to dry for one to two weeks. Then rub the heads with a rubber bung to dislodge the seeds. Use a sieve to separate any 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 65%.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
July 201610%63dNA Dry heat at 90 degrees C for 15 mins; soak in H2O2 for 20 mins then rinse; soak in 10% smoked water and 500 mg/L GA for 24 hrs
1% water agar
15˚C for 20 hrs, 5˚C for 4 hrs (winter) for 6 wks; then 22˚C for 12 hrs, 10˚C for 12 hrs (spring)      /  10 hrs for 6 wks (winter); then 12 hrs (spring)
July 20168%91dNA Dry heat at 90 degrees C for 15 mins; soak in H2O2 for 20 mins then rinse.
1% water agar
15˚C for 20 hrs, 5˚C for 4 hrs (winter) for 6 wks; then 22˚C for 12 hrs, 10˚C for 12 hrs (spring)      /  10 hrs for 6 wks (winter); then 12 hrs (spring)
July 20164%84dNA Soak in H2O2 for 20 mins then rinse; then soak in 10% smoked water for 24 hrs
1% water agar
15˚C for 20 hrs, 5˚C for 4 hrs (winter) for 6 wks; then 22˚C for 12 hrs, 10˚C for 12 hrs (spring)      /  10 hrs for 6 wks (winter); then 12 hrs (spring)
July 20164%63dNA Soak in H2O2 for 20 mins then rinse; then soak in 500 mg/L GA for 24 hrs
1% water agar
15˚C for 20 hrs, 5˚C for 4 hrs (winter) for 6 wks; then 22˚C for 12 hrs, 10˚C for 12 hrs (spring)      /  10 hrs for 6 wks (winter); then 12 hrs (spring)
July 20160%NANA Soak in H2O2 for 20 mins then rinse
1% water agar
15˚C for 20 hrs, 5˚C for 4 hrs (winter) for 6 wks; then 22˚C for 12 hrs, 10˚C for 12 hrs (spring)      /  10 hrs for 6 wks (winter); then 12 hrs (spring)
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)