Seeds of South Australia
Cycnogeton procerum (Juncaginaceae)
Large Water-ribbons
List of species for Cycnogeton
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Seed collecting:
September to March
Herbarium regions:
Murray, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, South Australian Murray-Darling Basin, South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Least Concern   [resilient spp; undercollected]
Bridgewater (NCP01)Naracoorte Coastal Plain
 Near Threatened   [resilient spp; undercollected; limited habitat]
Glenelg Plain (NCP02) 
 Least Concern   [resilient spp; undercollected]
Lucindale (NCP03) 
 Near Threatened   (Probable Decline)   [resilient spp; undercollected]
Tintinara (NCP04) 
 Rare   (IUCN: RA d(i,ii))   [limited habitat, Poochers Swamp; resilient spp]
Kangaroo Island (KAN01)Kanmantoo
 Least Concern   [on fresh water courses]
Fleurieu (KAN02) 
 Near Threatened   [well collected; change in water flow & quality, climate change - threats]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened   [well collected; change in water flow & quality, climate change - threats]
Broughton (FLB02) 
 Critically Endangered   (IUCN: CR D)   (Definite Decline)   [not databased]
St Vincent (EYB02)Eyre Yorke Block
 Critically Endangered   (IUCN: CR D)   (Definite Decline)   [possibly extinct]
Murray Mallee (MDD02)Murray Darling Depression
 Near Threatened   (Probable Decline)   [checked H Vonow; grows in water]
Murray Lakes and Coorong (MDD03) 
 Least Concern   [resilient spp; undercollected]
Murray Scroll Belt (RIV06)Riverina
 Near Threatened   (Probable Decline)   [winter grower]
IBRA regions
Mount Gambier (SVP02)Southern Volcanic PlainLeast Concern
  [resilient spp; undercollected]
4 of 4 subregionsNaracoorte Coastal PlainLeast Concern
, Near Threatened
, Rare
2 of 2 subregionsKanmantooLeast Concern
, Near Threatened
2 of 6 subregionsFlinders Lofty BlockNear Threatened
, Critically Endangered
St Vincent (EYB02)Eyre Yorke BlockCritically Endangered
  (IUCN: CR D)   (Definite Decline)   [possibly extinct]
2 of 6 subregionsMurray Darling DepressionLeast Concern
, Near Threatened
Murray Scroll Belt (RIV06)RiverinaNear Threatened
  (Probable Decline)   [winter grower]
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 Cycnogeton]
Name derivation:
Cycnogeton (formally Triglochin) from the Greek 'cycnos' meaning swan and 'geiton' meaning neighbour; referring to its closeness, taxonomically to Triglochin. Procerum from the Latin 'procerus' meaning high, tall or long; referring to its larger habit compared to other species. 
Found on Kangaroo Island, southern Mount Lofty Ranges, Murrayland and the South-east in South Australia, growing in still to slow-flowing fresh water to 2 m deep, mostly in permanent swamps, lagoons and streams, but can withstands extensive periods of dryness. Also found in Queensland, New South Wales, Victoria and Tasmania.
Native. Common in South Australia. Uncommon in Queensland. Common in the other states.
Plant description:
Robust, emergent, perennial, aquatic herb with thick, woody, fibre-covered rhizome to 30 mm long and roots ending in elongated tubers to 145 mm long and 13 mm diamter. Leaves flat and strap-like, floating to erect, dorsiventral, glossy above, to 350 cm long and 41 mm wide, thick and spongy basally. Inflorescence large erect to reclining  spike to 145 cm long  and 23 mm diameter with fruiting part at the end. Flowers in spring and summer.
Fruit type:
Yellow-green globular to ellipsoid fruit to 14 mm long and 11 mm wide with 52–320 per spike, each with a pedicel to 5 mm long. Seed segments (carpels) attached along most of its length and are straight to twisted around each other. 3-6 seeds per fruit.
Seed type:
Yellow-green segmented seed (carpel) to 9 mm long and 3 mm wide, with broad-convex dorsal ridge and two broad lateral ridges and slightly pointed apex.
Embryo type:
Seed collecting:
Collect mature fruits that are turning yellowish-green and seed segments come apart easily, either individually or by breaking off the spike. 
Seed cleaning:
Place the fruit in a tray and leave to dry for 1 to 2 weeks. No further cleaning is required collection consist of mainly individual seeds. If collected with other material, then rub the dried fruit 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 average, at 80%.