Seeds of South Australia
Isolepis cernua (Cyperaceae)
Nodding Club-sedge
List of species for Isolepis
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Seed collecting:
October to August
Herbarium regions:
Lake Eyre, 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
 Regionally Extinct   [possibly extinct]
Bridgewater (NCP01)Naracoorte Coastal Plain
 Near Threatened
Glenelg Plain (NCP02) 
 Rare   (IUCN: RA d(ii))
Lucindale (NCP03) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [limited habitat]
Tintinara (NCP04) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Kangaroo Island (KAN01)Kanmantoo
 Near Threatened   [annual]
Fleurieu (KAN02) 
 Least Concern
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Least Concern
Broughton (FLB02) 
 Least Concern   (Probable Decline)
Olary Spur (FLB03) 
 Least Concern   (Probable Decline)
Southern Flinders (FLB04) 
 Least Concern   (Probable Decline)
Northern Flinders (FLB05) 
 Rare   (IUCN: RA d(ii))   [northern edge of range; grows in springs]
Central Flinders (FLB06) 
 Near Threatened   [northern edge of range; grows in springs]
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern   (Probable Decline)
St Vincent (EYB02) 
 Least Concern   (Probable Decline)
Eyre Hills (EYB03) 
 Near Threatened
Talia (EYB04) 
 Near Threatened
Eyre Mallee (EYB05) 
 Near Threatened
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(ii))   [edge of range; needs floods/springs]
Murray Lakes and Coorong (MDD03) 
 Near Threatened
Lowan Mallee (MDD04) 
 Rare   (IUCN: RA d(i,ii))
Braemer (MDD07) 
 Least Concern   (Probable Decline)
Witjira (STP06)Stony Plains
 Vulnerable   (IUCN: VU D2)   [isolated outlier; water quality/visitors threats; grows in springs]
IBRA regions
DISPLAY ALL
Mount Gambier (SVP02)Southern Volcanic PlainRegionally Extinct
  [possibly extinct]
4 of 4 subregionsNaracoorte Coastal PlainNear Threatened
, Rare
2 of 2 subregionsKanmantooLeast Concern
, Near Threatened
6 of 6 subregionsFlinders Lofty BlockLeast Concern
, Near Threatened
, Rare
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Near Threatened
4 of 6 subregionsMurray Darling DepressionLeast Concern
, Near Threatened
, Rare
Witjira (STP06)Stony PlainsVulnerable
  (IUCN: VU D2)   [isolated outlier; water quality/visitors threats; grows in springs]
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. Cernua from Latin 'cernuus' meaning overhanging, nodding; referring to the drooping stems.
Distribution:
found in the southern part of South Australia, from the Gammon ranges to the lower South-east, growing in damp places, especially near the sea. Also found in all states except in the Northern Territory.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Small annual tufted sedge, rarely more than 10 cm high and often much less, sometimes with a short slender rhizome. Stems setaceous, erect or more or less curved, usually rigid. Leaves usually reduced to a small point, rarely longer and setaceous. Involucral bract 1, as though a continuation of the stem but somewhat glume-like at the base, mostly 3-7 mm long, shorter or longer than the spikelet. Spikelet nearly always solitary, oblique, broadly ovoid, to 3 mm long, usually chestnut and more or less shining, not angular, glumes tightly appressed, suborbicular, concave and indistinctly keeled. Flowers throughout the year.
Fruit type:
Single or few brown ovoid fruit-head at the end of stems.
Seed type:
Brown semi-flat ovoid seed to 0.8 mm long and 0.8 mm wide with a low and small tuberculate 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 low, at 30%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA44200 (4.34 g)3-Jan-2007RJB70973
Murray
1-Aug-200730%-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.