Bolboschoenus from the Greek 'bolbos' meaning a bulb and 'Schoenus' a genus of Cyperaceae from which it was considered separable by the swellings on the stem. Caldwellii named after A. C. Caldwell, of Hamilton, for many years an enthusiastic collector and student of our indigenous flora and who did much to stimulate the writer's interest in New Zealand's plants.
Distribution and status
Found in fresh or brackish water across the eastern side of South Australia. Also found in all other states. Native. Common in South Australia. Rare in Northern Territory. Common in all the other States.
Herbarium regions: Lake Eyre, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Southern Lofty, South Eastern
NRM regions: Adelaide and Mount Lofty Ranges, Eyre Peninsula, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
AVH map: SA distribution map (external link)
Rhizome creeping sedge to 90 cm high with hard ovoid tubers and three-sided stems. Leaves flat and grass-like. Inflorescence umbel-like, with 1-3 rays erect or spreading, or reduced to 1 or 2 golden- or red-brown spikelets. Fruits are dense red-brown clusters of fruiting heads. Seeds are brown ovoid nut to 3 mm long and 2.5 mm wide, smooth, shiny and covered with a fine mesh-like surface. Seed embryo type is capitate.
Seed collection and propagation
Collect seeds between October and March. Collect whole heads that are brown, containing golden hard seeds. 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. 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. From one collection, the seed viability was high, at 85%.
|Location||No. of seeds|
|30,100 (102.5 g)|
30,100 (102.5 g)