Seeds of South Australia
Callitriche sonderi (Callitrichaceae)
Matted Water Starwort
List of species for Callitriche
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Seed collecting:
January to December
Herbarium regions:
Lake Eyre, Murray, South Eastern
NRM regions:
South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Data Deficient   [1 record, Millbrook Reservoir, possible introduction]
Murray Mallee (MDD02)Murray Darling Depression
 Vulnerable   (IUCN: VU B2ab(i,ii,iii); C2a(i))   (Probable Decline)
Wimmera (MDD05) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [likes swamp edges, needs fresh water]
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(ii))   [comes & goes]
Breakaways (STP01)Stony Plains
 Rare   (IUCN: RA d(ii))   [undercollected, very small, occurs in large numbers in floods]
Oodnadatta (STP02) 
 Rare   (IUCN: RA d(ii))   [undercollected, very small, occurs in large numbers in floods]
Witjira (STP06) 
 Rare   (IUCN: RA d(ii))   [undercollected, very small, occurs in large numbers in floods]
Sturt Stony Desert (CHC02)Channel Country
 Near Threatened   [undercollected, very small, occurs in large numbers in floods]
Coongie (CHC06) 
 Least Concern   [undercollected, very small, occurs in large numbers in floods]
Lake Pure (CHC07) 
 Rare   (IUCN: RA d(ii))   [undercollected, very small, occurs in large numbers in floods]
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 Callitriche]
Name derivation:
Callitriche from the Greek 'kallos' meaning beautiful and 'thrix' or 'trikhos' meaning hair; referring to the beautiful hairy stems. Sonderi named after Dr. Otto Wilhelm Sonder (1812-1881), a German botanist, pharmacist and editor of Flora Capensis.
Found in the far north-east, Murray River and the South-east in South Australia, growing on river flood plains or other places subject to periodic inundation. Also found in Queensland, New South Wales, Victoria and Tasmania.
Native. Rare in South Australia. Very rare in Tasmania. Common in the other states.
Plant description:
Mostly terrestrial, mat-forming herb. Leaves linear-obovate, to 5 mm long and 1.5 mm wide, obscurely 3-veined. Upper leaves not rosetted. Flowers usually paired, a male and female together in opposite axils. Bracteoles linear-triangular, to 0.5 mm long, deciduous, stamen to 1 mm long, not elongating as fruit ripens, filament shorter than ripe fruit, styles erect, to 0.3 mm long, persistent.
Fruit type:
Dark-brown to greyish fruit, almost cordate in outline, to 0.6 mm long and 0.8 mm wide, keeled and only very weakly winged.
Seed type:
Tiny dark brown to black ovoid seed to 0.6 mm long and 0.4 mm wide, with a wrinkled surface.
Seed collecting:
Collect mature capsules, those that are turning a pale straw colour and contain hard seeds. Can collect individual capsules or break off the whole stems.
Seed cleaning:
Place the capsules in a tray and leave to dry for two weeks. Then rub the capsules gently by hand to dislodge the seeds. Use a sieve to separate the 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.