Plants of
South Australia
Gratwickia monochaeta
Compositae
One-bristle Everlasting
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Regional Species Conservation Assessments per IBRA subregion.
Least concern
Near threatened
Rare
Vulnerable
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Data deficient
Adelaide
Arkaroola
Ceduna
Coober Pedy
Hawker
Innamincka
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Oodnadatta
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Wudinna
Keith
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Botanical art

Kath Alcock paintings: 2.

Etymology

Gratwickia named after W.H Gratwick. Monochaeta from the Greek 'mono' meaning single and 'chaite' meaning bristle. referring to the single pappus bristle on the achenes.

Distribution and status

Endemic to South Australia and found in the central part and on Eyre Peninsula growing on various sites but usually in sand. Native. Rare in South Australia.
Herbarium regions: Lake Eyre, Nullarbor, Gairdner-Torrens, Eastern, Eyre Peninsula
NRM regions: Alinytjara Wilurara, Eyre Peninsula, South Australian Arid Lands
AVH map: SA distribution map (external link)

Plant description

Sparsely to much-branched annual herbs to 18 cm tall and to 10 cm diameter, with several ascending stems; stems and branches sometimes purple-tinged, with moderately dense woolly hairs and sessile glandular hairs, becoming less dense with age. Leaves narrowly oblanceolate, almost linear, with recurved margins, to 30 mm long and 2 mm broad; covered in woolly hairs, more dense on the underside. Flower-heads several in tight clusters terminating the stems and branches with bright golden-yellow flowers. Flowering between August and October. Fruits are brown daisy head. Seeds are light brown ovoid seed to 0.8 mm long and 0.4 mm wide, with a single pappus bristle. Seed embryo type is spatulate fully developed.

Seed collection and propagation

Collect seeds between October and December. Collect whole heads that are drying off and turning golden brown or collect just the seeds by plucking it off with your fingers. Mature seeds are easily removed. Place the heads in a tray for a week to dry. Then pluck the seeds from the head with your finders. Viable seeds will be fat and brown. 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 one collection, the seed viability was high, at 100%. Seeds are non-dormant, viable seed should germinate readily.

Seeds stored:
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LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
21,000 (1.01 g)
21,000 (1.01 g)
1002-Nov-2009DJD1605
Eyre Peninsula
1-Jun-2010100%+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.