Seeds of South Australia
Baumea articulata (Cyperaceae)
Jointed Twig-sedge
List of species for Baumea
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Seed collecting:
February to May
Herbarium regions:
Flinders Ranges, Murray, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Rare   (IUCN: RA d(i,ii))
Bridgewater (NCP01)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Glenelg Plain (NCP02) 
 Rare   (IUCN: RA d(i,ii))
Lucindale (NCP03) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii); D2)   (Probable Decline)   [very restricted]
Fleurieu (KAN02)Kanmantoo
 Rare   (IUCN: RA d(ii))   [limited habitat; likes fresh water]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   [declining naturally but also planted in wetlands]
Central Flinders (FLB06) 
 Vulnerable   (IUCN: VU D2)   [northern limit; highly localised; climate sensitive]
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [edge of range; often planted]
Murray Lakes and Coorong (MDD03) 
 Rare   (IUCN: RA d(ii))
Wimmera (MDD05) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii); D2)   (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 Baumea]
Name derivation:
Baumea named after Antoine Baume (1728–1804), a French chemist and inventor. Articulata  meaning to have joints.
Distribution:
Found standing water of lagoons, deeper swamps and streams, mainly in the Mount Lofty Ranges and the lower South-east in South Australia, with isolated occurrence in the Flinders Ranges. Also found in Western Australia, Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Common in South Australia. Common in other states.
Plant description:
Perennial sedge with cylindrical stems to 2m high, hollow, with more or less distinct transverse partitions. Leaves basal, long, like the stems but the transverse partitions very prominent, the tips tapering and rather pungent; lowest bract rather similar but short. Flower in loose panicle to 40cm long, drooping with numerous brown spikelets.
Fruit type:
Large brown drooping heads.
Seed type:
Brown ovoid nut to 3mm long and 2mm wide with 3 vertical ridges arising from the base.
Embryo type:
Capitate.
Seed collecting:
Collect whole heads that are brown, containing dark hard seeds. Not all heads will contain seeds.
Seed cleaning:
Place the spike in a tray and leave to dry for one to two weeks. Then rub the spikes 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 available.
Seed viability:
From two collections, the seed viability were high, ranging from 90% to 95%.
Seed germination:
This species is generally difficult to germinate, it has morphophysiological dormancy and complex germination requirements.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
11500 (17.1 g)
11500 (17.1 g)
50+22-Mar-2006DJD436
Southern Lofty
28-Jul-200690%-18°C
BGA20000 (30.93 g)28-Feb-2007RJB71586
Southern Lofty
1-Aug-200795%-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.