Seeds of South Australia
Isolepis platycarpa (Cyperaceae)
Flat-fruit Club-sedge
List of species for Isolepis
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Seed collecting:
September to May
Herbarium regions:
Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Mount Gambier (SVP02)Southern Volcanic Plain
 Rare   (IUCN: RA d(i,ii))
Bridgewater (NCP01)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Glenelg Plain (NCP02) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Lucindale (NCP03) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Tintinara (NCP04) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Kangaroo Island (KAN01)Kanmantoo
 Near Threatened   [undercollected]
Fleurieu (KAN02) 
 Near Threatened   [perennial]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened   [perennial]
Broughton (FLB02) 
 Least Concern
Southern Flinders (FLB04) 
 Rare   (IUCN: RA d(ii))
Central Flinders (FLB06) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [climate sensitive; perennial; around springs]
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern
St Vincent (EYB02) 
 Endangered   (IUCN: EN D)   (Definite Decline)
Eyre Hills (EYB03) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
Eyre Mallee (EYB05) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
Lowan Mallee (MDD04)Murray Darling Depression
 Rare   (IUCN: RA d(ii))
Wimmera (MDD05) 
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Gawler Volcanics (GAW02)Gawler
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
IBRA regions
DISPLAY ALL
Mount Gambier (SVP02)Southern Volcanic PlainRare
  (IUCN: RA d(i,ii))
4 of 4 subregionsNaracoorte Coastal PlainRare
2 of 2 subregionsKanmantooNear Threatened
4 of 6 subregionsFlinders Lofty BlockLeast Concern
, Near Threatened
, Rare
4 of 5 subregionsEyre Yorke BlockLeast Concern
, Vulnerable
, Endangered
2 of 6 subregionsMurray Darling DepressionRare
Gawler Volcanics (GAW02)GawlerVulnerable
  (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
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 Isolepis]
Name derivation:
Isolepis from the Greek 'isos' meaning equal and 'lepis' meaning scale; referring to the glumes. Platycarpa from the Greek 'platys' meaning broad and 'karpos' meaning fruit.
Distribution:
Found in the southern part of South Australia, growing in moist areas. Also found in New South Wales, Victoria and Tasmania.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Small tufted annual sedge to 8 cm high. Stems setaceous, leaf blades to 3 cm long and setaceous, sometimes absent, bract sometimes longer than the cluster, similar to the leaves, to 5 mm long. Spikelets 1 or 2, often solitary, ovoid-ellipsoid, to 3.5 mm long (similar to those of I. hookeriana but rather broader and less distinctly angled), glumes to 1.5 mm long, with spreading points, the sides somewhat opaque. Flowering between September and April.
Fruit type:
Brown fruit-head with 1-2 spikelets in clusters at the end of stems.
Seed type:
Brown globular seed to 0.9 mm long and 0.6 mm wide with a low and small ovoid mesh-liked surface.
Embryo type:
Capitate.
Seed collecting:
Collect fruits either by picking off the mature heads, those turning brown and come-off easily or pull out the whole plant.
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. Be careful, as the seeds are very small. Seeds are brown and hard. 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 95%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA4800 (0.61 g)5002-Oct-2007RJB75084
South Eastern
19-Sep-200895%-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.