Seeds of South Australia
Baumea rubiginosa (Cyperaceae)
Soft Twig-sedge
List of species for Baumea
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Seed collecting:
August, December to March
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)   [questionable records]
Glenelg Plain (NCP02)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)   [questionable record]
Kangaroo Island (KAN01)Kanmantoo
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [blue gum plantations, herbicides - threats]
Fleurieu (KAN02) 
 Near Threatened   [possible decline]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Vulnerable   (IUCN: VU D2)
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [edge of range]
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. Rubiginosa means rusty-reddish colour.
Found on Kangaroo Island, Fleurieu Peninsula and the lower South-east in South Australia, growing in swamps and other damp areas, on sandy soil. Also found in all States.
Native. Uncommon in South Australia. Common in the other States.
Plant description:
Perennial sedge with subterete or somewhat angled or compressed stems to 100 cm high, usually with 1 node above the base. Basal leaves rather wider than the stems, more or less compressed. Stem leaves with long sheaths and short channelled blades, all the blades pungent-pointed. Flowers in narrow, dense or interrupted zig-zag panicle with reddish or brown ovoid spikelets in erect  clusters, crowded  along the branches. Flowering between spring and summer.
Fruit type:
Long, dense golden-brown heads at the tip of stems.
Seed type:
Red- brown ovoid nut to 3 mm long and 2 mm wide with shiny smooth surface.
Embryo type:
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.
Seed viability:
Not all mature-looking seeds are viable. From two collections, the seed viability was average to high, ranging from 65% to 80%.
Seed germination:
This species is generally difficult to germinate, it has morphophysiological dormancy and complex germination requirements.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
BGA1153 (3 g)50+5-Apr-2005DJD 129
Southern Lofty
6361 (17.43 g)
6650 (18.25 g)
50+5-Apr-2005DJD 131
Southern Lofty
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.