Seeds of South Australia
Cyperus bulbosus (Cyperaceae)
Bush Onion
List of species for Cyperus
Display more images
Click on an image to enlarge it
Seed collecting:
June to October
Herbarium regions:
North Western, Lake Eyre, Gairdner-Torrens, Flinders Ranges, Eastern
NRM regions:
Alinytjara Wilurara, South Australian Arid Lands
IBRA regions
SUMMARY
Olary Spur (FLB03)Flinders Lofty Block
 Vulnerable   (IUCN: VU D1+2)   [edge of range]
Southern Flinders (FLB04) 
 Vulnerable   (IUCN: VU D1+2)   [edge of range]
Northern Flinders (FLB05) 
 Near Threatened   [needs drainage lines]
Gawler Lakes (GAW03)Gawler
 Rare   (IUCN: RA d(ii))   [southern limit]
Arcoona Plateau (GAW04) 
 Rare   (IUCN: RA d(ii))   [southern limit]
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(ii))   [southern limit]
Torrens (GAW06) 
 Least Concern   [needs drainage lines]
Roxby (GAW07) 
 Rare   (IUCN: RA d(i,ii))   [needs drainage lines]
Tallaringa (GVD05)Great Victoria Desert
 Least Concern   [needs drainage lines]
Simpson Desert (SSD02)Simpson Strzelecki Dunefields
 Least Concern   [needs drainage lines]
Dieri (SSD03) 
 Least Concern   [needs drainage lines]
Strzelecki Desert (SSD05) 
 Least Concern   [needs drainage lines]
Breakaways (STP01)Stony Plains
 Rare   (IUCN: RA d(i,ii))   [needs drainage lines]
Oodnadatta (STP02) 
 Least Concern   [needs drainage lines]
Murnpeowie (STP03) 
 Least Concern   [needs drainage lines]
Peake-Dennison Inlier (STP04) 
 Rare   (IUCN: RA d(i,ii))   [needs drainage lines]
Macumba (STP05) 
 Least Concern   [needs drainage lines]
Witjira (STP06) 
 Least Concern   [needs drainage lines]
Baltana (STP07) 
 Least Concern   [needs drainage lines]
Sturt Stony Desert (CHC02)Channel Country
 Least Concern   [needs drainage lines]
Diamantina-Eyre (CHC04) 
 Near Threatened   [needs drainage lines]
Coongie (CHC06) 
 Least Concern   [needs drainage lines]
Lake Pure (CHC07) 
 Rare   (IUCN: RA d(ii))   [needs drainage lines]
Mann-Musgrave Block (CER01)Central Ranges
 Rare   (IUCN: RA d(ii))   [needs drainage lines]
Everard Block (CER03) 
 Least Concern   [needs drainage lines]
Tieyon (FIN03)Finke
 Rare   (IUCN: RA d(i,ii))   [needs drainage lines]
Pedirka (FIN04) 
 Least Concern   [needs drainage lines]
IBRA regions
DISPLAY ALL
3 of 6 subregionsFlinders Lofty BlockNear Threatened
, Vulnerable
5 of 8 subregionsGawlerLeast Concern
, Rare
Tallaringa (GVD05)Great Victoria DesertLeast Concern
  [needs drainage lines]
3 of 4 subregionsSimpson Strzelecki DunefieldsLeast Concern
7 of 7 subregionsStony PlainsLeast Concern
, Rare
4 of 4 subregionsChannel CountryLeast Concern
, Near Threatened
, Rare
2 of 3 subregionsCentral RangesLeast Concern
, Rare
2 of 2 subregionsFinkeLeast Concern
, Rare
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. Bulbosus from Latin meaning bulbous; referring to the numerous ovoid bulbils at the ends of the rhizomes.
Distribution:
Found in the north-east part of South Australia, growing on sand near claypans. Also found in Western Australia, Northern Territory, Queensland and New South Wales.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Perennial sedge to 35 cm high, producing numerous ovoid shining bulbils at the ends of the rhizomes, the latter very soon disintegrating. Stems slender, triquetrous. Laves numerous, almost setaceous, about as long as the stem. Inflorescence of rather few spikelets arranged in a simple or compound spike or short corymb, with the rays and bracts distant from one another, one or more of the lower bracts longer than the inflorescence. Spikelets reddish to pallid, linear or somewhat lanceolate, to 30 mm long and 2 mm wide, with 10-28-flowers. Flowering between April and July. 
Fruit type:
Reddish-brown loose spike.
Seed type:
Dark brown oblong triangular seed to 1.8 mm long and 0.6 mm wide, with fine tuberculated surface.
Embryo type:
Capitate.
Seed collecting:
Collect fruits by picking off the mature heads, those turning brown colour 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.