Seeds of South Australia
Isolepis fluitans (Cyperaceae)
Floating Club-rush
List of species for Isolepis
Display more images
Click on an image to enlarge it
Seed collecting:
November to April
Herbarium regions:
Eyre Peninsula, Northern Lofty, Murray, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Mount Gambier (SVP02)Southern Volcanic Plain
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [undercollected ]
Bridgewater (NCP01)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [undercollected ]
Glenelg Plain (NCP02) 
 Rare   (IUCN: RA d(i,ii))   [undercollected ]
Lucindale (NCP03) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [undercollected ]
Kangaroo Island (KAN01)Kanmantoo
 Near Threatened   [depends on water quality; herbicides a threat]
Fleurieu (KAN02) 
 Near Threatened
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened
Southern Flinders (FLB04) 
 Critically Endangered   (IUCN: CR D)   (Definite Decline)
Eyre Hills (EYB03)Eyre Yorke Block
 Critically Endangered   (IUCN: CR B2ab(i,ii,iii))   (Definite Decline)   [needs fresh water, possibly extinct]
Murray Mallee (MDD02)Murray Darling Depression
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [edge of range]
Lowan Mallee (MDD04) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
Wimmera (MDD05) 
 Rare   (IUCN: RA d(i,ii))   [undercollected ]
Myall Plains (GAW01)Gawler
 Critically Endangered   (IUCN: CR B2ab(i,ii,iii))   (Definite Decline)   [needs fresh water, possibly extinct]
IBRA regions
DISPLAY ALL
Mount Gambier (SVP02)Southern Volcanic PlainRare
  (IUCN: RA d(i,ii))   (Probable Decline)   [undercollected ]
3 of 4 subregionsNaracoorte Coastal PlainRare
2 of 2 subregionsKanmantooNear Threatened
2 of 6 subregionsFlinders Lofty BlockNear Threatened
, Critically Endangered
Eyre Hills (EYB03)Eyre Yorke BlockCritically Endangered
  (IUCN: CR B2ab(i,ii,iii))   (Definite Decline)   [needs fresh water, possibly extinct]
3 of 6 subregionsMurray Darling DepressionRare
, Vulnerable
Myall Plains (GAW01)GawlerCritically Endangered
  (IUCN: CR B2ab(i,ii,iii))   (Definite Decline)   [needs fresh water, possibly 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 Isolepis]
Name derivation:
Isolepis from the Greek 'isos' meaning equal and 'lepis' meaning scale; referring to the glumes. Fluitans from the Greek 'fluito' meaning floating; referring to the species habit.
Distribution:
Found on Kangaroo Island, Mount Lofty Ranges and the South-east in South Australia, growing in swamps and streams. Also found in all states except the Northern Territory.
Status:
Native. Rare in South Australia. Rare in Queensland. Common in the other states.
Plant description:
Slender, aquatic or dry-land perennial sedge. Stems weak, filiform, leafy, submerged and elongated or creeping and procumbent or erect and tufted and to 10 cm high. Spikelets solitary, elliptic in outline, strongly flattened, 5–10-flowered (rarely to 15 flowers), 3–5 mm long, involucral bract shorter than to slightly exceeding spikelet, glume-like or with a short thickened appendage. Glumes obtuse, conspicuously numerous-nerved, to 2.8 mm long, straw-coloured with red-brown patches. Flowering between October and February.
Fruit type:
Small single dense fruit-head at the end of stems.
Seed type:
Light brown ovoid seed to 1.3 mm long and 0.8 mm wide with a fine reticulate 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 light 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.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA21000 (4.17 g)503-Dec-2007RJB74992
Southern Lofty
19-Sep-200880%-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.