Seeds of South Australia
Cyperus lucidus (Cyperaceae)
Leafy Flat-sedge
List of species for Cyperus
Click on an image to enlarge it
Seed collecting:
December to April
Herbarium region:
South Eastern
NRM region:
South East
IBRA region
Glenelg Plain (NCP02)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)   [SE Aust spp.]
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. Lucidus from the Latin 'lucindus' meaning shiny; alluding to the glossy leaves.
Distribution:
Found only in the lower South-east in South Australia, growing on the banks of the Glenelg River. Also found in Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Very rare in South Australia. Common in the other states.
Plant description:
Tufted perennial sedge to 1 m or more high. Stems fairly robust, trigonous, smooth. Leaves often longer than the stems, flat or channelled, with numerous short transverse septa showing as shallow ridges on the surface (septate-nodulose), to c. 13 mm broad, scabrid on the margins, bracts 3-6, like the leaves, the lower longer than the inflorescence. Flower-spike an umbel compound; rays rigid, up to 12, to 20 cm long; spikelets rather numerous in dense globose or cylindrical spikes to 5 cm long, rich-brown, linear or somewhat lanceolate, 5-10-flowered, flatfish, acute, 5-12 mm long, less than 1 mm broad; rhachilla winged; glumes not closely arranged, tightly appressed or the tips spreading, acute in profile, with the keel nearly straight or slightly curved inwards distally, with 2 or 3 veins on each side, c. 4 mm long; stamens 3; style 3-branched. Flowering bewteen October and February.
Fruit type:
Flat, reddish brown fruit-head in dense clusters.
Seed type:
Brown oblong seed to 2.5 mm long and 0.7 mm wide.
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.
Seed viability:
From one collection, the seed viability was high, at 90%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
36400 (8.2 g)
36400 (8.2 g)
3-Jan-2008RJB76864
South Eastern
19-Sep-200890%+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.