Plants of
South Australia
Amphibromus archeri
Pointed Swamp Wallaby-grass
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Regional Species Conservation Assessments per IBRA subregion.
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Amphibromus from the Greek 'amphi' meaning double and 'bromus' a grass genus, referring to the spikelets resembling those of the genus Bromus. Archeri named after William Archer (1820-1874), Fellow of the Linnaean Society, architect and parliamentarian in Tasmania.

Distribution and status

Found on Kangaroo Island, Mount Lofty ranges and the Southeast, growing in damp areas such as lagoons, waterholes and swamps, often on predominantly sandy soils. Also found in Victoria and Tasmania. Native. Common in South Australia. Common in the other States.
Herbarium regions: Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Southern Lofty, Kangaroo Island, South Eastern
NRM regions: Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
AVH map: SA distribution map (external link)

Plant description

An erect perennial grass to 1.2 m tall with leaf blades to 32 cm long and 4 mm wide, glabrous to scabrous below, deeply ribbed with short stiff hairs on the ribs above. Panicle erect to 35 cm long, spikelets to 18 mm long, with 3-7 bisexual florets. Glumes unequal, glabrous. Flowering between October and January. Fruits are lemma more or less smooth to densely papillose. Lemma apex 4-toothed. Awn arising 30-45% of the lemma length from the lemma tip, bent, twisted, scabrous, 14.5-17.5 mm long, pale-green to a dark purple-brown. Seeds are yellow-brown grain to 2mm long. Seed embryo type is lateral.

Seed collection and propagation

Collect seeds between November and February. 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. 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. From four collections, the seed viability was low to high, ranging from 40% to 100%.

Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage

4,100 (8.768 g)
Southern Lofty
BGA3,000 (0.84 g)501-Dec-2007RJB75970
Southern Lofty
19-Sep-2008100%+5°C, -18°C
BGA920 (2.41 g)3022-Dec-2008DJD1410
Southern Lofty
BGA1,700 (5.01 g)50+18-Jan-2011Kuitpo
Southern Lofty
BGA6,900 (22.32 g)150+29-Nov-2016KHB906
Southern Lofty
1-Nov-2017 +5°C, -18°C, -80°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: