Seeds of South Australia
Isolepis hookeriana (Cyperaceae)
Hooker's Club-rush
List of species for Isolepis
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Seed collecting:
November to April
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
Tintinara (NCP04)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(ii))
Kangaroo Island (KAN01)Kanmantoo
 Least Concern   [undercollected]
Fleurieu (KAN02) 
 Rare   (IUCN: RA d(ii))
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened   [undercollected]
Broughton (FLB02) 
 Rare   (IUCN: RA d(i,ii))   [a few pops.]
Southern Flinders (FLB04) 
 Rare   (IUCN: RA d(i,ii))   [a few pops.]
Northern Flinders (FLB05) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii); D2)   (Probable Decline)   [northern edge of range; climate sensitive; habitat quality decline; no recent records]
Central Flinders (FLB06) 
 Rare   (IUCN: RA d(i,ii))
Southern Yorke (EYB01)Eyre Yorke Block
 Endangered   (IUCN: EN D)   (Definite Decline)
Eyre Hills (EYB03) 
 Critically Endangered   (IUCN: CR B2ab(i,ii,iii))   (Definite Decline)   [Wanilla forest]
Murray Lakes and Coorong (MDD03)Murray Darling Depression
 Regionally Extinct   [possibly extinct]
Wimmera (MDD05) 
 Rare   (IUCN: RA d(i,ii))
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. Hookeriana named after Sir Joseph Dalton Hooker (1817-1911), one of the greatest British botanist and explorers of the 19th century, a founder of geographical botany and director of the Royal Botanical Gardens at Kew.
Found on the Eyre and Yorke Peninsulas, Kangaroo Island, Flinders Ranges and the Mount Lofty Ranges in South Australia, growing in seasonally wet areas and creek banks. Also found in all states except the Northern Territory.
Native. Uncommon in South Australia. Common in the other states.
Plant description:
Small tufted annual sedge to 12 cm high. Stems setaceous, leaf blades to 3 mm long, filiform, more often absent, bract shorter or longer than the cluster, somewhat glume-like. Spikelets 1 or 2 in a cluster, oblique, ovoid to oblong, angular, several-flowered, to 3.5 mm long, glumes to 1.5 mm long, 5-7-nerved, with a green keel, the lateral nerves faint, the tip spreading. Flowering between September to February.
Fruit type:
Few brown ovoid fruit-head in clusters at the end of stems.
Seed type:
Shiny brown globular seed to 0.6 mm long and 0.5 mm wide with a rectangular mesh-like surface.
Embryo type:
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 black 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
BGA16000 (1.87 g)501-Nov-2007RJB75135
Southern Lofty
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.