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 knob.
Distribution:
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.
Status:
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.