Xanthorrhoea preissii
Encyclopedia
Xanthorrhoea preissii
, with the common name Balga, is a widespread species of perennial monocot in Southwest Australia
. This plant, and other members of the genus Xanthorrhoea
, are also known as grasstrees. The form of the plant resembles a tree, with very long and bunched, grass-like, leaves that emerge from a central base.
The trunk may grow over 3 metres tall, the often blackened appearance is evidence of its ability to withstand fire. The remains of the flammable leaves and the annual regrowth produce banding, allowing the age of the plant to be determined, and giving a record of previous fires in its habitat. The inflorescence appears on an upright spike, 1.5m to 2.5m long, between June and December. The sessile flowers, creamy or white, appear more profusely when stimulated by bushfire.
It is found throughout coastal plains, near watercourses, and inland forest regions, in a range extending from Geraldton to Albany and in the Avon Wheatbelt
. It occurs on a wide variety of soil types and is sometimes associated with laterite and granite.
The species had a high economic importance to the Noongar
people, who named it Balga, using the gum it contains, the spike for fish spears, and the Bardi grub as a source of food. Anecdotal information on the species refers to an association with fire in the culture of those people. It was first described by Stephan Endlicher in the 1846 volume of Plantae Preissianae. The appearance of the plant was seen as resembling a native inhabitant, holding a spear, by the early settlers of the region; in Western Australia it is commonly referred to as a blackboy.
The species is named as one of the dominant taxa in Corymbia calophylla – Xanthorrhoea preissii woodlands and shrublands of the Swan Coastal Plain, a critically endangered ecological community, once widespread and now restricted to a narrow range. Its occurrence is a characteristic of two other Marri (Corymbia calophylla
) communities, but the Marri/Xanthorrhoea community is distinguished by the drier soils of the communities range along the eastern edge of the Swan Coastal Plain
.
, with the common name Balga, is a widespread species of perennial monocot in Southwest Australia
Southwest Australia
Southwest Australia is a biodiversity hotspot that includes the Mediterranean forests, woodlands, and scrub ecoregions of Western Australia. The region has a wet-winter, dry-summer Mediterranean climate, one of five such regions in the world...
. This plant, and other members of the genus Xanthorrhoea
Xanthorrhoea
Xanthorrhoea is a genus of flowering plants native to Australia and a member of family Xanthorrhoeaceae, being the only member of subfamily Xanthorrhoeoideae. The Xanthorrhoeaceae are monocots, part of order Asparagales. There are 28 species and five subspecies of Xanthorrhoea.-Description:All are...
, are also known as grasstrees. The form of the plant resembles a tree, with very long and bunched, grass-like, leaves that emerge from a central base.
The trunk may grow over 3 metres tall, the often blackened appearance is evidence of its ability to withstand fire. The remains of the flammable leaves and the annual regrowth produce banding, allowing the age of the plant to be determined, and giving a record of previous fires in its habitat. The inflorescence appears on an upright spike, 1.5m to 2.5m long, between June and December. The sessile flowers, creamy or white, appear more profusely when stimulated by bushfire.
It is found throughout coastal plains, near watercourses, and inland forest regions, in a range extending from Geraldton to Albany and in the Avon Wheatbelt
Avon Wheatbelt
Avon Wheatbelt is an Interim Biogeographic Regionalisation for Australia region in Western Australia and part of the larger Southwest Australia savanna ecoregion.-Further reading:...
. It occurs on a wide variety of soil types and is sometimes associated with laterite and granite.
The species had a high economic importance to the Noongar
Noongar
The Noongar are an indigenous Australian people who live in the south-west corner of Western Australia from Geraldton on the west coast to Esperance on the south coast...
people, who named it Balga, using the gum it contains, the spike for fish spears, and the Bardi grub as a source of food. Anecdotal information on the species refers to an association with fire in the culture of those people. It was first described by Stephan Endlicher in the 1846 volume of Plantae Preissianae. The appearance of the plant was seen as resembling a native inhabitant, holding a spear, by the early settlers of the region; in Western Australia it is commonly referred to as a blackboy.
The species is named as one of the dominant taxa in Corymbia calophylla – Xanthorrhoea preissii woodlands and shrublands of the Swan Coastal Plain, a critically endangered ecological community, once widespread and now restricted to a narrow range. Its occurrence is a characteristic of two other Marri (Corymbia calophylla
Corymbia calophylla
Corymbia calophylla is a bloodwood native to Western Australia. Common names include Marri and Port Gregory Gum, and a long standing usage has been Red Gum due to the red gum effusions often found on trunks.It is distinctive among bloodwoods for its very large buds and fruit Corymbia calophylla...
) communities, but the Marri/Xanthorrhoea community is distinguished by the drier soils of the communities range along the eastern edge of the Swan Coastal Plain
Swan Coastal Plain
The Swan Coastal Plain in Western Australia is the geographic feature which contains the Swan River as it travels west to the Indian Ocean. The coastal plain continues well beyond the boundaries of the Swan River and its tributaries, as a geological and biological zone, one of Western Australia's...
.