Seeds of South Australia
Isolepis producta (Cyperaceae)
Nutty Club-sedge
List of species for Isolepis
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Seed collecting:
October to April
Herbarium regions:
Kangaroo Island, South Eastern
NRM regions:
Kangaroo Island, South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Vulnerable   (IUCN: VU D2)
Glenelg Plain (NCP02)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)
Kangaroo Island (KAN01)Kanmantoo
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
Wimmera (MDD05)Murray Darling Depression
 Vulnerable   (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. Producta from the Latin 'productus' meaning lengthened or elongated; alluding to the shape of the seeds.
Distribution:
From on Kangaroo Island and the lower South-east in South Australia, floating in shallow water. Also found in Western Australia, New South Wales, Victoria and Tasmania.
Status:
Native. Very rare in South Australia. Common in the other states.
Plant description:
Mat-forming annual or short-lived perennial sedge. Stems filiform, weak, floating, often many-noded (similar to I. fluitans but sometimes more slender and always strongly tinged with purple, particularly on the leaf sheaths and at the edge of the glumes). Leaves very slender. Spikelet solitary, terminal on long peduncles rising from the tufts of leaves, ovoid, to 5 mm long, glumes 6-10, nearly all containing bisexual flowers, the lowest glume always produced into a leafy point as long as or longer than ,the spikelet. Flowering between October and March. Isolepis producta is diagnosed by the lowest glume being equal in length to and partially covering the spikelet.
Fruit type:
Singular brown fruit-head at the end of the stems.
Seed type:
Pale yellow narrow ovoid-triangular seed to 1.6 mm long and 0.9 mm wide with a fine reticulate surface.
Embryo type:
Capitate.
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 pale 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.