Seeds of South Australia
Callitriche umbonata (Callitrichaceae)
Water Starwort
List of species for Callitriche
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Seed collecting:
November to January
Herbarium regions:
Murray, South Eastern
NRM regions:
South Australian Murray-Darling Basin, South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Vulnerable   (IUCN: VU D2)
Lucindale (NCP03)Naracoorte Coastal Plain
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)
Tintinara (NCP04) 
 Vulnerable   (IUCN: VU D1+2)   [restricted habitat, poss. EN, Mt Monster]
Southern Flinders (FLB04)Flinders Lofty Block
 Endangered   (IUCN: EN D)
Lowan Mallee (MDD04)Murray Darling Depression
 Endangered   (IUCN: EN B2ab(i,ii,iii); C2a(i))   (Definite Decline)   [threatened by loss of habitat]
Murray Scroll Belt (RIV06)Riverina
 Endangered   (IUCN: EN B2ab(i,ii,iii); C2a(i))   (Probable Decline)   [threatened by loss of habitat]
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. Umbonata mean with a raised central boss or hump.
Found along the Murray River and the South-east in South Australia, growing in damp and swampy places. Also found in New South Wales, Victoria and Tasmania.
Native. Rare in South Australia. Rare in the other States.
Plant description:
Mostly amphibious, spreading or submerged. Leaves in aquatic plants dimorphic with lower leaves linear, to 20 mm long and 1 mm wide, 1-veined, tapering towards tip. Upper leaves rosette, obovate, to 10 mm long and 4 mm wide, 3-5-veined, linear leaves absent-in terrestrial plant. Flowers solitary in the axils of the leaves, the females often in opposite axils, white. Flowering between August and December.
Fruit type:
Dark-brown to grey capsule to 1.5 mm long and 1.2 mm wide, slightly longer than wide, thickened at base, wing prominent.
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.