Seeds of South Australia
Isolepis inundata (Cyperaceae)
Swamp Club-rush
List of species for Isolepis
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Seed collecting:
September, November to June
Herbarium regions:
Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
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))
Lucindale (NCP03) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Kangaroo Island (KAN01)Kanmantoo
 Near Threatened   [n water courses]
Fleurieu (KAN02) 
 Least Concern
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Least Concern
Southern Flinders (FLB04) 
 Rare   (IUCN: RA b)   (Definite Decline)
Central Flinders (FLB06) 
 Vulnerable   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [localised in Wilpena]
Eyre Hills (EYB03)Eyre Yorke Block
 Regionally Extinct
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Murray Lakes and Coorong (MDD03) 
 Rare   (IUCN: RA d(ii))   (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. Inundata from the Latin 'inundo' meaning flooded; referring to the species tolerance for growing in boggy or wet areas.
Found in the southern part of South Australia, growing in creeks, swamps and seasonally wet depressions. Also found in all states except the Northern Territory.
Native. Uncommon in South Australia. Rare in Western Australia. Common in the other states.
Plant description:
Variable perennial sedge with stems tufted, sometimes coarser than in most species, rigid or flaccid, to 30 cm high, sometimes proliferous. Leaf blades usually reduced to a mere point, sometimes more developed, bract usually longer than the spikelets, erect or oblique. Spikelets mostly 3-12 in a cluster, ovoid to oblong, to 6 mm long, somewhat angled, usually stained with a dark purplish-brown, glumes with a green keel and scarious 3- or 4-nerved sides, slightly mucronate, the tip erect. Flowering between October and April. Isolepis inundata is diagnosed by the reduced leaf blade, proliferating inflorescence and reticulate nutlets.
Fruit type:
Brown ovoid fruit-head in dense clusters at the end of stems.
Seed type:
Yellow ovoid-triangular seed to 0.8 mm long and 0.6 mm wide with fine pitted surface.
Embryo type:
Seed collecting:
Collect fruits by picking off the mature heads, those turning brown and come-off easily.
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 yellow 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)
of plants
Collection number
Collection location
% ViabilityStorage
BGA8250 (1.65 g)323-Jan-2007RJB70794
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.