Plants of
South Australia
Senecio longicollaris
Compositae
Riverina Fireweed
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Regional Species Conservation Assessments per IBRA subregion.
Least concern
Near threatened
Rare
Vulnerable
Endangered
Critically endangered
Extinct
Data deficient
Adelaide
Arkaroola
Ceduna
Coober Pedy
Hawker
Innamincka
Marla
Marree
Mount Gambier
Oodnadatta
Renmark
Wudinna
Keith
Yunta
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Etymology

Senecio from the Latin 'senex' meaning an old man, referring to the white pappus attached to the seed. Longicollaris from the Latin 'longus' meaning long and 'collaris' meaning of the neck, referring to the long-necked achenes.

Distribution and status

Found along the Murray River and Lake Alexandrina in South Australia, growing in floodplains and edge of rivers. Also found in Queensland, New South Wales and Victoria. Native. Very rare in South Australia. Very rare in the other states.
Herbarium regions: Murray, Southern Lofty
NRM regions: Adelaide and Mount Lofty Ranges, South Australian Murray-Darling Basin
AVH map: SA distribution map (external link)

Plant description

Erect herb to 1.8 m high with fleshy roods. Leaves in middle third of stems evenly spaced and sized, very narrow elliptic, 8–24 cm long, denticulate, upper surface sparsely appressed-cottony, glabrescent, lower surface green, with sparse to moderate coarse hairs. Inflorescence corymbose with 30–100 yellow rayless daisy flower. Flowers throughout the year but mostly between September and February. Fruits are large fluffy daisy-head with exposed white pappus. Achenes 4–6 mm long, brown; pappus 6–7 mm long. Seeds are brown cylindrical seed to 6 mm long and 0.4 mm wide, dilated at one end and tapering to a slender neck at the other, with scattered hairs along the ridges and long pappus. Seed embryo type is spatulate fully developed.

Seed collection and propagation

Collect seeds between November and April. Collect heads that are large and fluffy. Either pick off the whole heads or use your finger and pull off the seeds from the head. Mature seeds will come off easily. Place the heads in a tray for a week to dry. No cleaning is required if only pure seeds are collected. If heads are collected, then rub the heads gently with your hands to dislodge the seeds. Viable seeds will be fat and hard. 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. From four collections, the seed viability were average to high, ranging from 79% to 92%.

Seeds stored:
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LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
 
MSB

7,150 (3.36 g)
50+1-Dec-2006RJB70709
Murray
BGA3,600 (0.7 g)2020-Nov-2007RJB76150
Murray
19-Sep-200890%-18°C
BGA2,350 (0.41 g)50+24-Feb-2012MJT378
Murray
1-Nov-201279%-18°C
BGA5,600 (1.85 g)100+3-Apr-2012DJD2361
Murray
1-Nov-201292%+5°C, -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:
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