Seeds of South Australia
Aristida obscura (Gramineae)
Small Brush Wire-grass
List of species for Aristida
Click on an image to enlarge it
Seed collecting:
May to September
Herbarium region:
North Western
NRM region:
Alinytjara Wilurara
IBRA regions
Kintore (GVD04)Great Victoria Desert
 Near Threatened
Tallaringa (GVD05) 
 Near Threatened   [uncommon]
Breakaways (STP01)Stony Plains
 Near Threatened   [uncommon]
Witjira (STP06) 
 Near Threatened   [uncommon]
Mann-Musgrave Block (CER01)Central Ranges
 Near Threatened
Tieyon (FIN03)Finke
 Near Threatened   [uncommon]
Pedirka (FIN04) 
 Near Threatened   [uncommon]
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 Aristida]
Name derivation:
Aristida from the Latin 'arista' meaning awned, alluding to the awned lemma. Obscura from Latin meaning dark, referring to the dark-coloured spikelets.
Distribution:
Found in the far north-west corner of South Australia. Also found in Western Australia, Northern Territory, Queensland and New South Wales.
Status:
Native. Common in South Australia. Common in other states.
Plant description:
Tufted perennial grass to 54cm tall with leaf blades flat to convolute, up to 15cm long and 1.5mm wide. Inflorescence loose and contracted to open, to 15cm long and almost as wide. Glumes 1-nerved unequal, the lower about two-thirds the length of the upper; aristulate, the lower c. 8 mm long, the upper c. 13.5 mm long; lemma c. 12 mm long (including the callus of c. 1 mm long); convolute, densely tuberculate-warty. Awns filiform 30-35 mm long, subequal, the laterals shorter by 1-3 mm.
Fruit type:
Dark brown with three unequal awns much longer than the base.
Seed type:
Long pale grain to 10mm long and less than 1mm wide.
Embryo type:
Lateral.
Seed collecting:
Use hands to gently strip seeds off the mature seed spike that are turning straw colour. Mature seeds will come off easily. Alternatively, you can break off the whole seed spike.
Seed cleaning:
Place the seeds/spike in a tray and leave to dry for two weeks. No further cleaning is required if only seed collected. If seed spikes collected, use hand to strip off the mature seeds. 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 average, at 70%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
2000 (5.6 g)
2000 (5.6 g)
3018-May-2007RJB71937
North Western
1-Aug-200770%-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.