Seeds of South Australia
Cyperus concinnus (Cyperaceae)
Trim Flat-sedge
List of species for Cyperus
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Seed collecting:
October to May
Herbarium region:
Lake Eyre
NRM region:
South Australian Arid Lands
IBRA region
Lake Pure (CHC07)Channel Country
 Rare   (IUCN: RA d(ii))
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 Cyperus]
Name derivation:
Cyperus from the Latin 'cyperos' and derived from the Greek 'kypeiros', an ancient Greek name used by Homer and Theophrastus for several plants of this genus. Concinnus from Latin meaning neat or trim; alluding to the species compact and attractive habit.
Distribution:
Found in the far north-east corner of South Australia, growing on red sandy soils on the margins of ephemeral water bodies. It is all found in all mainland states.
Status:
Native. Rare in South Australia. Rare in Victoria. Uncommon in Western Australia. Common in the other states.
Plant description:
Tufted perennial sedge with very short rhizome. Stems trigonous, scabrous above, slightly swollen at base to 65 cm high and 3 mm diameter. Leaves shorter or a little longer than the stem, to 2 mm wide. Inflorescence compound with 3–5 primary branches to 4 cm long, arranged in clusters, involucral bracts leaf-like, 1–3 much exceeding inflorescence. Spikelets flattened, 1–6 per cluster, to 10 mm long and 2.5 mm wide, with 12–32-flowered, dark red-brown to blackish. Flower in spring and summer.
Fruit type:
Flat reddish-brown loose fruit cluster.
Seed type:
Pale brown ovoid triangular seed to 0.4 mm long and 0.3 mm wide, with a tuberculate surface.
Embryo type:
Capitate.
Seed collecting:
Collect fruits by picking off the mature heads, those turning reddish brown and come-off easily.
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.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA170000 (2.72 g)100+8-May-2011DJD2175
Lake Eyre
1-Jan-2012+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.