Seeds of South Australia
Spirodela punctata (Lemnaceae)
Spotted Duckweed
List of species for Spirodela
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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
 Vulnerable   (IUCN: VU D2)   [limited habitat]
Glenelg Plain (NCP02)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)   [limited habitat]
Fleurieu (KAN02)Kanmantoo
 Near Threatened
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Least Concern
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Murray Lakes and Coorong (MDD03) 
 Least Concern   [around lake edges]
Wimmera (MDD05) 
 Vulnerable   (IUCN: VU D2)   [limited habitat]
Murray Scroll Belt (RIV06)Riverina
 Least Concern
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 Spirodela]
Name derivation:
Spirodela from the Greek 'speira' meaning a coil, wreath and 'delos' meaning clear, conspicuous; referring to the spiral vessels in the structure of the plant. Punctata from the Latin 'punctatus' meaning spotted 
Found in the southern Mlount Lofty Ranges, Murrayland and the South-east in South Australia, growing in stagnant ponds or slow-running water-ways, edges of tidal flats, in springs and swamps. Also found in all states 
Native. Common in South Australia.
Plant description:
Free-floating, sometimes mat-forming, aquatic herb with 2-8 roots to 4 cm, all perforating scale. Thallus (fronds) rounded or broadly obovate, to 5 mm long and 2.5 mm wide, upper surface green, bottom surface often purplish.
Fruit type:
Fruits 0.8-1 mm, laterally winged to apex. 
Seed type:
Seeds with 10--15 distinct ribs.