Seeds of South Australia
Amaranthus macrocarpus var. macrocarpus (Amaranthaceae)
Dwarf Amaranth
List of species for Amaranthus
Click on an image to enlarge it
Seed collecting:
March to May
Herbarium regions:
Lake Eyre, Eastern, Murray
NRM regions:
South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
Olary Spur (FLB03)Flinders Lofty Block
 Rare   (IUCN: RA d(i))   [Pualco St]
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(i,ii))   [flood dependent]
Coongie (CHC06)Channel Country
 Rare   (IUCN: RA d(i,ii))   [edge of range]
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 Amaranthus]
SA Flora:
Flora of South Australia Edition 5
Name derivation:
Amaranthus from the Greek 'a' meaning not and 'marantos' meaning withering, a name used for an everlasting flower. Macrocarpus from the Latin 'macros' meaning large and 'carpos' meaning fruit.
Distribution:
Few collections from the Innamincka and Murray regions in South Australia, growing on floodplain. Also found in Northern Territory, Queensland, New South Wales and Victoria.
Status:
Native. Rare in South Australia. Rare in Northern Territory and Victoria. Uncommon in Queensland. Common in New South Wales.
Plant description:
Prostrate to decumbent, glabrous annual with stems to 40 cm long. Leaves long-petiolate, elliptic to obovate to 20 mm long and 15 mm wide. Flowers unisexual, in axillary clusters. Flowering between December and March.
Fruit type:
Dark brown to black spongy, narrowly ovoid fruit. Differ from the other variety Amaranthus macrocarpus var. pallidus which has a pale straw coloured fruit.
Seed type:
Semi-flat ovoid, black seed to 1.2 mm long and 0.8 mm wide.
Embryo type:
Peripheral.
Seed collecting:
Collect mature capsules, those that are turning black and contain hard seeds. Whole stem containing many clusters of fruit can be collected.
Seed cleaning:
Place the capsules/stems in a tray and leave to dry for two weeks. Then rub the capsules/stems gently by hand to dislodge the seeds. Use a sieve to separate the unwanted material. Be very careful as the seeds are very small. 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 95%.
Seed germination:
Seeds are non-dormant, viable seed should germinate readily.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA54000 (16.74 g)50+13-May-2008RJB77873
Eastern
19-Sep-200895%-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.