Plants of
South Australia
Leptorhynchos tenuifolius
Compositae
Wiry Buttons
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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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Botanical art

Kath Alcock paintings: 8.

Etymology

Leptorhynchos from the Greek 'leptos' meaning slender and 'rhynchos' meaning a snout; alluding to the beaked achenes of some species. Tenuifolius from the Latin 'tenuis' meaning thin, slender and 'folium' meaning a leaf.

Distribution and status

Found in the lower South-east in South Australia, growing in open swampy areas in sandy soils. Also found in Victoria. Native. Rare in South Australia. Common in Victoria.
Herbarium region: South Eastern
NRM region: South East
AVH map: SA distribution map (external link)

Plant description

Perennial herb to 40 cm high with wiry, much-branched stems, erect to ascending covered in hairs. Leaves linear, to 4 cm long (basal leaves to 15 cm) and 1 mm wide (basal leaves to 3 mm wide), acute, upper surface glabrous, lower surface densely cottony, margins recurved. Flower-heads obconical, to 5 mm diameter; outer involucral bracts linear, transparent with brown tip, margins with dense, spreading cottony cilia; inner bracts like outer ones but with long, herbaceous glandular claws; florets bright yellow. Flowering between November and March. Fruits are white fluffy daisy-head. Seeds are black oblong-elipical seed to 2 mm long and 0.5 mm wide, smooth surface with few long feathered-like papus at one end. Seed embryo type is spatulate fully developed.

Seed collection and propagation

Collect seeds between December and April. Collect heads that are 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. 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. From two collections, the seed viability was average to high, ranging between 75% to 90%.

Seeds stored:
  Hide
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA11,000 (1.1 g)5023-Feb-2008RJB77418
South Eastern
19-Sep-200890%+5°C, -18°C
BGA 
MSB
7,000 (0.76 g)
7,000 (0.76 g)
50+7-Jan-2008TST284
South Eastern
19-Sep-200875%+5°C, -18°C
BGA3,900 (0.27 g)10-Dec-2009DJD1774
South Eastern
27-Feb-201495%-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.