Seeds of South Australia
Baumea rubiginosa (Cyperaceae)
Soft Twig-sedge
List of species for Baumea
Click on an image to enlarge it
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 colour.
Distribution:
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.
Status:
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 and with a zig-zag panicle with reddish or brown, in erect ovoid spikelets clusters close together  along the branches. Flowering between spring and summer.
Fruit type:
Long, dense golden brown heads at the tip of stems.
Seed type:
Golden brown ovoid nut to 3 mm long and 2 mm wide with shiny smooth surface.
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.
Seed viability:
Not all good looking seeds are viable. From two collections, the seed viability were 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)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA1153 (3 g)50+5-Apr-2005DJD 129
Southern Lofty
28-Mar-200665%-18°C
BGA 
MSB
6361 (17.43 g)
6650 (18.25 g)
50+5-Apr-2005DJD 131
Southern Lofty
28-Mar-200680%-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.