Calamus australis

Description

Stems may reach lengths of up to 35 m and a diameter of 2 cm. The leaves (or fronds) are produced on the youngest part of the stem, and the older sections are bare as the leaves age and fall off (the same process as the more familiar upright palm with a stout stem). The older, leafless part of the stem of Calamus australis is smooth and glossy green.

The leaves have a long leaf sheath clasping the stem, which is densely covered with needle-like spines measuring up to 10 cm long, but usually less. Tendrils, measuring several metres in length and armed with many stout, recurved barbs are produced from the leaf sheath. The leaf itself is pinnate, up to 1.5 m in length, and has around 20 to 25 pairs of leaflets. Leaves are armed with stout recurved barbs on the lower surfaces of the rachis. Unlike its very similar sister species C. radicalis, it does not have spines on the leaflets themselves. The overall outline of the leaf is elliptic and the longest leaflets are at the midpoint of the frond, measuring about 30 cm long by 3 cm wide.

The inflorescences are pendulous panicles measuring up to 2 m in length, carrying either staminate (functionally male) or pistillate (functionally female) flowers.

Fruits are a white or cream drupe, around 8 to diameter, with a scaly exterior. They contain a single spherical seed which is surrounded by a thin layer of soft edible flesh.

Taxonomy

Calamus australis was first described 1838 by the German botanist Carl Friedrich Philipp von Martius in volume 3 of his highly regarded work Historia naturalis palmarum.

Distribution and habitat

This is the most widespread of the eight Australian species of Calamus. It is endemic to tropical areas of Queensland, from the tip of Cape York Peninsula south to near Rockhampton on the Tropic of Capricorn, and from sea level to about 1600 m. It grows in gallery forest and well developed rainforest.

Ecology

Fruits of this species are eaten by fruit doves (genus Ptilinopus) and southern cassowaries (Casuarius casuarius).

Conservation

This species is listed by Queensland's Department of the Environment, Tourism, Science and Innovation as least concern. , it has not been assessed by the IUCN.

Uses

Indigenous Australians had many uses for this plant and its sister species. The young shoots were eaten, along with the fruits. The long flexible stem was used to make shelters, axe handles, fish traps, snares, and waist straps for climbing trees, and the thorny tendrils were used to catch fish.

Gallery

File:Calamus-australis-2-SF21348-03.jpg|Rachis with spines File:Calamus-australis-3-SF21348-04.jpg|Fruit File:Calamus-australis-4-SF21348-01.jpg|Foliage and stem File:Calamus-australis-SF22246-03.jpg|Tendril File:Calamus-australis-SF22180-03.jpg|Underside of leaf, showing barbs on rachis

References

References

1. (2022). "Species profile—''Calamus australis''". [[Queensland Government]].
2. "''Calamus australis''". Centre for Plant Biodiversity Research, [[Australian Government]].
3. "''Calamus australis'' Mart.". [[Royal Botanic Gardens, Kew]].
4. (2022). "''Calamus australis''". [[Australian Biological Resources Study]], Department of Agriculture, Water and the Environment: Canberra.
5. (2020). "''Calamus australis''". Centre for Australian National Biodiversity Research (CANBR), [[Australian Government]].
6. (June 2004). "Fruits of the Australian Tropical Rainforest". Nokomis Editions.
7. (1995). "A Guide to Traditional Aboriginal Rainforest Plant Use". Bamanga Bubu Ngadimumku Inc..