Seeds of South Australia
Malvastrum americanum var. americanum (Malvaceae)
Spiked Malvastrum
List of species for Malvastrum
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Seed collecting:
January to December
Herbarium regions:
North Western, Lake Eyre, Nullarbor, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands
IBRA regions
Olary Spur (FLB03)Flinders Lofty Block
 Least Concern   [prob in all regions E of here ]
Northern Flinders (FLB05) 
 Least Concern   [spreading]
Central Flinders (FLB06) 
 Least Concern   [spreading]
Braemer (MDD07)Murray Darling Depression
 Least Concern
Gawler Lakes (GAW03)Gawler
 Least Concern
Arcoona Plateau (GAW04) 
 Least Concern
Kingoonya (GAW05) 
 Least Concern
Roxby (GAW07) 
 Least Concern   [spreading]
Commonwealth Hill (GAW08) 
 Least Concern   [spreading]
Kintore (GVD04)Great Victoria Desert
 Least Concern   [spreading]
Bimbowrie (BHC05)Broken Hill Complex
 Least Concern
Curnamona (BHC06) 
 Least Concern
Dieri (SSD03)Simpson Strzelecki Dunefields
 Least Concern   [spreading]
Warriner (SSD04) 
 Least Concern   [spreading]
Strzelecki Desert (SSD05) 
 Least Concern   [spreading]
Breakaways (STP01)Stony Plains
 Least Concern   [spreading]
Oodnadatta (STP02) 
 Least Concern   [spreading]
Murnpeowie (STP03) 
 Least Concern   [spreading]
Peake-Dennison Inlier (STP04) 
 Least Concern   [spreading]
Macumba (STP05) 
 Least Concern   [spreading]
Witjira (STP06) 
 Least Concern   [spreading]
Baltana (STP07) 
 Least Concern   [spreading]
Sturt Stony Desert (CHC02)Channel Country
 Least Concern   [spreading]
Diamantina-Eyre (CHC04) 
 Least Concern   [spreading]
Coongie (CHC06) 
 Least Concern   [spreading]
Lake Pure (CHC07) 
 Least Concern   [spreading]
Mann-Musgrave Block (CER01)Central Ranges
 Least Concern   [spreading]
Watarru (CER02) 
 Least Concern   [spreading]
Everard Block (CER03) 
 Least Concern   [spreading]
IBRA regions
3 of 6 subregionsFlinders Lofty BlockLeast Concern
Braemer (MDD07)Murray Darling DepressionLeast Concern
5 of 8 subregionsGawlerLeast Concern
Kintore (GVD04)Great Victoria DesertLeast Concern
2 of 4 subregionsBroken Hill ComplexLeast Concern
3 of 4 subregionsSimpson Strzelecki DunefieldsLeast Concern
7 of 7 subregionsStony PlainsLeast Concern
4 of 4 subregionsChannel CountryLeast Concern
3 of 3 subregionsCentral RangesLeast Concern
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 Malvastrum]
Name derivation:
Malastrum from the genus Malva and the Latin 'aster' meaning like, but implying incomplete likeness or inferior. Americanum means of or from the Americas; referring to the species natural distribution in the warmer parts of the Americas.
Found in the northern part of South Australia, growing around waterholes, bores, swamps and clay pans, floodouts, riparian vegetation and in disturbed areas. Also found in Western Australia, Northern Territory, Queensland and New South Wales.
Introduced. Common in South Australia. Common in the other states.
Plant description:
Erect, annual or short-lived perennial herb to 50 cm tall covered in stellate hairs. Leaves alternate ovate to broadly ovate, to 7 cm long and 6 cm wide. Inflorescence a dense terminal spike to 4.5 cm long with yellow to orange flowers. Flowering throughout the year. 
Fruit type:
Brown depressed-globular capsule on a long spike, each with 9 seed segments.
Embryo type:
Seed collecting:
Collect capsules that are drying off and starting to turn brown and seeds inside should be brown and hard. Collect either individual mature capsule or break-off the whole spike.
Seed cleaning:
Place the capsules into a tray and leave to dry for a week. Then rub the capsules by hand or with a rubber bung 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.
Seed germination:
This species has physical dormancy that needs to be overcome for the seed to germinate (e.g. nicking or softening the seed coat).