Seeds of South Australia
Baumea laxa (Cyperaceae)
Lax Twig-sedge
List of species for Baumea
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Seed collecting:
December to February
Herbarium regions:
Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Kangaroo Island, South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Vulnerable   (IUCN: VU D2)
Bridgewater (NCP01)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)   [very limited; some pops stable]
Glenelg Plain (NCP02) 
 Vulnerable   (IUCN: VU D2)
Kangaroo Island (KAN01)Kanmantoo
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [threatened by herbicide; in narrow drainage lines/creeks; very scarce]
Fleurieu (KAN02) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [seen in creeks, swamps, peat bogs]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Endangered   (IUCN: EN B2ab(i,ii,iii); D)   (Probable Decline)   [only 3 pops known; highly localised]
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. Laxa from Latin meaning loose or slack; alluding to its weeping habit.
Distribution:
Found on Kangaroo Island, Southern Mount Lofty Ranges and lower South-east in South Australia. Also found in Western Australia and Victoria.
Status:
Native. Rare in South Australia. Uncommon in the other states.
Plant description:
Perennial sedge with stems to 60 cm long, very flat with acute edges or one side somewhat concave, striate, to 8 mm wide. Leaves all basal, equitant and like the stems, acute. Flowers in narrow, very loose and interrupted panicle, occupying about half the length of the plant with solitary spikelets. Flowering in spring.
Fruit type:
Narrow, brown heads at the tip of stems.
Seed type:
Smooth, brown ovoid nut to 6mm long and 3mm wide.
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 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 available.
Seed viability:
From two collections, t eh seed viability were high, ranging from 90% to 100%.
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
7500 (42.75 g)
7500 (42.75 g)
6716-Jan-2007RJB71196
Southern Lofty
1-Aug-2007100%+5°C, -18°C
BGA12300 (7.17 g)15-Dec-2008DJD1421
Kangaroo Island
20-Jul-200990%+5°C, -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.