Seeds of South Australia
Isolepis hystrix (Cyperaceae)
Awned Club-rush
List of species for Isolepis
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Seed collecting:
October to January
Herbarium regions:
Gairdner-Torrens, Murray, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Kangaroo Island, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
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. Hystrix from Greek meaning hedgehog; alluding to the bristly inflorescences.
Distribution:
Scattered mainland in the southern part of South Australia, growing in seasonally wet open areas and roadside ditches. Also found in Western Australia, New South Wales, Victoria and Tasmania. 
Status:
Original from South Africa and is introduced in Australia.
Plant description:
Small tufted annual sedge to 5 cm high. Stems slender, striate, leaf blades flat or plano-convex, striate, to 1 mm wide, as long as or longer than the inflorescence, bract leaf-like but broad below, usually spreading, to 2 cm long. Spikelets 1 or few, bristly, broad, to 5 mm long, 20-30-flowers, glumes to 3.2 mm long, green, with the broad-ovate lower part often reddish-tinged, terminating in a spreading attenuate portion at least as long as the basal part. Flowering between October and November. Isolepis hystrix is diagnosed by the mucronate glumes, trifid styles and minutely papillose nutlets.
Fruit type:
Few brown bristly fruit-head in clusters at the end of stems.
Seed type:
Dark brown to black ovoid seed to 0.8 mm long and 0.4 mm wide with a 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 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.