Seeds of South Australia
Amaranthus interruptus (Amaranthaceae)
Native Amaranth
List of species for Amaranthus
Click on an image to enlarge it
Seed collecting:
January to December
Herbarium regions:
North Western, Lake Eyre, Flinders Ranges
NRM regions:
Alinytjara Wilurara, South Australian Arid Lands
IBRA regions
Northern Flinders (FLB05)Flinders Lofty Block
 Rare   (IUCN: RA d(i,ii))   [rocky areas ]
Oodnadatta (STP02)Stony Plains
 Rare   (IUCN: RA d(ii))
Macumba (STP05) 
 Rare   (IUCN: RA d(ii))
Witjira (STP06) 
 Rare   (IUCN: RA d(ii))
Baltana (STP07) 
 Rare   (IUCN: RA d(ii))
Sturt Stony Desert (CHC02)Channel Country
 Rare   (IUCN: RA d(ii))   [probably increasing; likes disturbance]
Mann-Musgrave Block (CER01)Central Ranges
 Rare   (IUCN: RA d(ii))
Watarru (CER02) 
 Rare   (IUCN: RA d(ii))
Everard Block (CER03) 
 Rare   (IUCN: RA d(ii))
Pedirka (FIN04)Finke
 Rare   (IUCN: RA d(ii))
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. Interruptus from the Latin 'inter' meaning between and 'ruptus' to break; maybe alluding to the irregular splitting of the fruit capsule.
Distribution:
Found scattered across the arid region of South Australia. Also found in Western Australia, Northern Territory and Queensland.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Decumbent to erect herb to 60 cm tall. Petioles grooved on the upper surface, to 10 mm long. Leaf blades to 27 mm long and 16 mm wide, underside of the leaf blade sparsely covered in dark brown hairs. Inflorescence to 8 mm long. Flowers small to 1 mm long, consist of 3 tepals fused only near the base. Anthers about 1.5mm long. Flowers throughout the year.
Fruit type:
Wrinkled, ovoid o ellipsoid capsule to 2 mm long, breaking irregularly.
Seed type:
Very small black, reniform seed to 1.5 mm long and 1 mm wide.
Embryo type:
Peripheral.
Seed collecting:
Collect mature capsules, those that are turning a pale straw colour and contain black 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 two collections, the seed viability was high, ranging from 95% to 100%.
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
BGA30000 (19.35 g)12-Mar-2007RJB70959
Lake Eyre
19-Sep-200895%-18°C
BGA26600 (37.82 g)508-May-2007RJB71573
Lake Eyre
19-Sep-2008100%-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.