Seeds of South Australia
Centipeda nidiformis (Compositae)
Cotton Sneezeweed
List of species for Centipeda
Click on an image to enlarge it
Seed collecting:
March to July
Herbarium regions:
Lake Eyre, Murray, South Eastern
NRM regions:
South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
Lucindale (NCP03)Naracoorte Coastal Plain
 Data Deficient   [lack of records]
Murray Mallee (MDD02)Murray Darling Depression
 Near Threatened   (Probable Decline)   [restricted to river; flood dependent]
Wimmera (MDD05) 
 Data Deficient   [lack of records]
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [flood dependent]
Sturt Stony Desert (CHC02)Channel Country
 Near Threatened   [restricted to flood plains; common during good season]
Coongie (CHC06) 
 Near Threatened   [restricted to flood plains; common during good season]
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 Centipeda]
Name derivation:
Centipeda from Latin for centipede, from 'centi' meaning hundred and 'ped' meaning foot, referring to the creeping stems. Nidiformis meaning nest-shaped, referring to the depressed-hemispherical flower receptacle.
Distribution:
Found in three disjunct locations in South Australia in Innamincka, along the Murray River and in the upper South-east, growing along the margins of watercourses on clay or clay-loam soils. Also found in all mainland States.
Status:
Native. Uncommon in South Australia. Uncommon in Western Australia, New South Wales and Victoria. Common in the other States.
Plant description:
Decumbent to ascending cottony annual, spreading to 15 cm diameter and to 15 cm high; adventitious roots not or rarely produced. Branches densely white-cottony, at least on young growth. Leaves more or less spatulate to 10 mm long and 5 mm wide, usually with very slender petiole-like bases that are often almost as long as, (occasionally longer than) the broader part of the lamina; shallowly toothed or sub-entire; surfaces light to densely cottony, with scattered resin droplets. Flower heads yellow with no petals, globular when fully open to 5 mm diam, solitary. Flowering between January and April.
Fruit type:
Dense brown daisy head.
Seed type:
Pale brown four-angled pyramidal seed  to 1.2 mm long and 0.4 mm wide with scattered hairs on the narrower part.
Embryo type:
Spatulate.
Seed collecting:
Collect heads that are drying off and turning brown.
Seed cleaning:
Place the heads in a tray for a week to dry. Then rub the heads gently with your hands or a rubber bung to dislodge the seeds. Use a sieve to separate the unwanted material. Be 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 average, at 50%.
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
BGA41300 (1.44 g)2017-May-2007RJB71826
North Western
19-Sep-200850%-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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Oct-1576%7 d7 d 500 mg/L gibberellic acid 48 h;
1% agar;
Incubated under spring/autumn conditions
Oct-1568%7 d7 d 500 mg/L gibberellic acid 48 h;
1% agar;
Incubated under winter conditions
Oct-1554%7 d14 d
1% agar;
Incubated under spring/autumn conditions
Oct-1540%7 dNA
1% agar;
Incubated under winter conditions
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)