Seeds of South Australia
Leptorhynchos melanocarpus (Compositae)
Lake Acraman Button-daisy
List of species for Leptorhynchos
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Seed collecting:
September to November
Herbarium region:
Eyre Peninsula
NRM region:
South Australian Arid Lands
IBRA region
Gawler Lakes (GAW03)Gawler
 Vulnerable   (IUCN: VU D2)   [localised endemic, only 1 record]
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 Leptorhynchos]
Name derivation:
Leptorhynchos from the Greek 'leptos' meaning slender and 'rhynchos' meaning a snout; alluding to the beaked achenes of some species. Melanocarpa from the Greek 'melas' meaning dark, black and 'carpos' meaning fruit; referring to the black achenes.
Distribution:
Endemic to South Australia and found only at Lake Acraman on the northern Eyre Peninsula, growing on gypseous mounds. More abundant after heavy rains.
Status:
Native. Very rare in South Australia.
Plant description:
Annual herb to to 50 cm high. Leaves terete, grey-tomentose. Florets yellow, long hairy bracts. Flowering in winter and spring.
Fruit type:
White fluffy daisy-head with black seeds.
Seed type:
Black oblong-elliptic seeds to 2 mm long and 0.5 mm wide, with a tubercule surface.
Embryo type:
Spatulate fully developed.
Seed collecting:
Collect heads that are fluffy. Either pick off the whole heads or use your finger and pull off the seeds from the head. Mature seeds will come off easily.
Seed cleaning:
Place the heads in a tray for a week to dry. No cleaning is required if only pure seeds are collected. If heads are collected, then rub the heads gently with your hands to dislodge the seeds. Viable seeds will be fat and hard. 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.
Seed viability:
From one collection, the seed viability was high, at 100%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
50000 (9.9 g)
14500 (2.6 g)
300+19-Sep-2009DJD1587
Gairdner-Torrens
Jun-2011100%+5°C, -18°C
Location: BGA — the seeds are stored at the Adelaide Botanic Gardens, MSB — the seeds are stored at the Millennium Seed Bank, Kew, England.
Number of plants: This is the number of plants from which the seeds were collected.
Collection location: The Herbarium of South Australia's region name.
% Viability: Percentage of filled healthy seeds determined by a cut test or x-ray.