Tangled lignum | |
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Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Order: | Caryophyllales |
Family: | Polygonaceae |
Genus: | Duma |
Species: | D. florulenta |
Binomial name | |
Duma florulenta | |
Occurrence data from AVH | |
Synonyms [1] | |
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Duma florulenta (synonym Muehlenbeckia florulenta), commonly known as tangled lignum or often simply lignum, is a plant native to inland Australia. It is associated with wetland habitats, especially those in arid and semiarid regions subject to cycles of intermittent flooding and drying out. The Wiradjuri name for the plant is gweeargal, [2] and the Walmajarri name is Kirinykiriny, or Kurinykuriny. [3]
Lignum is a perennial, dioecious [4] shrub, growing to 2.5 m in height, with its multitude of thin, intertwined and tangled branches and branchlets forming dense thickets to the exclusion of other species. Its thin, narrow leaves are 15–70 mm long and 2–10 mm wide. [5] The grey-green stems often end in a sharp point. The flowers are small and cream to yellowish, solitary or clustered along the branchlets and occurring through most of the year. The fruit is top-shaped, dry, and about 5 mm long. [6]
Lignum often appears leafless as the leaves are produced on younger growth but soon die off, especially in dry conditions. New leaves and shoots are rapidly produced in response to rainfall or flooding. [2] The plant has a very deep root system, penetrating the soil to at least 3 m in depth. It is highly tolerant of salinity and drought and may be used as an indicator of dryland soil salinity. [6] Because of its densely tangled growth habit, it provides protected breeding habitat for native wildlife such as waterbirds, though it can also provide refuge for pest species such as feral pigs, foxes and rabbits. [2]
The species was first described by Carl Meisner in 1856 as Muehlenbeckia florulenta. [7] Molecular phylogenetic studies showed that M. florulenta, along with some other species placed in the same genus, form a distinct clade, separate from Muehlenbeckia, so a new genus, Duma , was erected, and this species transferred as Duma florulenta. [8] [9]
Lignum occurs in all of Australia's mainland states, as well as the Northern Territory. The plant's preferred habitats include floodplains, swamps, gilgais and other intermittently flooded areas. In southern Australia it is often associated with stands of river red gum and black box. [6]
During the long period when the Australian government took children from their aboriginal parents (see Stolen generations), the Walmajarri people hid themselves and their children within the dense tangle of these plants so that the police could not find them. [3]
The Polygonaceae are a family of flowering plants known informally as the knotweed family or smartweed—buckwheat family in the United States. The name is based on the genus Polygonum, and was first used by Antoine Laurent de Jussieu in 1789 in his book, Genera Plantarum. The name may refer to the many swollen nodes the stems of some species have, being derived from Greek [poly meaning 'many' and gony meaning 'knee' or 'joint']. Alternatively, it may have a different origin, meaning 'many seeds'.
A Ramsar site is a wetland site designated to be of international importance under the Ramsar Convention, also known as "The Convention on Wetlands", an intergovernmental environmental treaty established on 2nd February 1971 in Ramsar, Iran by UNESCO, which came into force from 21st December,1975. It provides for national action and international cooperation regarding the conservation of wetlands, and wise sustainable use of their resources. Ramsar identifies wetlands of international importance, especially those providing waterfowl habitat.
Fallopia is a genus of about 12 species of flowering plants in the buckwheat family, often included in a wider treatment of the related genus Polygonum in the past, and previously including Reynoutria. The genus is native to temperate and subtropical regions of the Northern Hemisphere, but species have been introduced elsewhere. The genus includes species forming vines and shrubs.
Muehlenbeckia or maidenhair is a genus of flowering plants in the family Polygonaceae. It is native to the borders of the Pacific, including South and North America, Papua New Guinea and Australasia. It has been introduced elsewhere, including Europe. Species vary in their growth habits, many being vines or shrubs. In some environments, rampant species can become weedy and difficult to eradicate.
Muehlenbeckia complexa is a plant commonly known as pohuehue, although this name also applies to some other climbers such as Muehlenbeckia australis.
Muehlenbeckia astonii or shrubby tororaro is an endemic New Zealand shrub in the family Polygonaceae. It has distinctive small heart-shaped deciduous leaves amidst a tangle of wiry interlocking branches. Although common in cultivation around the world, it is extremely rare and threatened in the wild.
Muehlenbeckia horrida subsp. abdita. commonly known as remote thorny lignum, is a critically endangered shrub endemic to Western Australia.
Rumex spinosus, commonly known as devil's thorn, spiny dock, or lesser jack, is an annual herbaceous plant of the Polygonaceae. It originates in the warmer parts of the old world, but now has spread with humans to other places. It is common in disturbed areas, especially in sandy soils. It has shown some weedy behaviour in restricted areas within southern Australia.
Lake Batyo Catyo is a human-made freshwater lake located 26 km west of the town of St Arnaud in North Central Victoria, Australia. It is now dry, as the inflow channel from the Richardson River was permanently closed in 2012.
Juncus acutus, the spiny rush, sharp rush or sharp-pointed rush, is a flowering plant in the monocot family Juncaceae. It is native to the Americas, Northern and Southern Africa, Western and Southern Europe and West Asia, and is found in a variety of wet habitats, such as bogs, fens, meadows, and salt marshes, and along the edges of ponds and lakes.
Casuarina glauca, commonly known as swamp she-oak, swamp buloke, swamp she-oak, marsh sheoak, grey she-oak, grey she-oak or guman by the Gadigal people, is a species of flowering plant that is endemic to eastern Australia. It is a dioecious tree that often forms root suckers and has fissured and scaly bark, spreading or drooping branchlets, the leaves reduced to scales in whorls of 12 to 20, the fruit 9–18 mm (0.35–0.71 in) long containing winged seeds (samaras) 3.5–5.0 mm (0.14–0.20 in) long.
Muehlenbeckia adpressa, commonly known as climbing lignum, is a prostrate or climbing plant, native to Australia. It has thin red-brown stems up to 1 metre in length. The leaves are 1.5–6 centimetres (0.59–2.36 in) long and 1.5–3.5 centimetres (0.59–1.38 in) wide. It occurs in coastal areas of Western Australia, South Australia, Tasmania, Victoria and New South Wales.
Muehlenbeckia axillaris is a low evergreen shrub, forming wiry mats up to about 1 metre in diameter, native to New Zealand, and the Australian states of Tasmania, New South Wales and Victoria. It has thin, red-brown stems, with glossy squarish to roundish leaves that are less than 1 cm (0.39 in) in diameter and 2–4 mm (0.079–0.157 in) thick. Flowers are inconspicuous, yellowish-white, 4–8 mm (0.16–0.31 in) in diameter, and borne in groups of up to three in the axils. The fruit is black, shiny, and up to 3.5 mm (0.14 in) long, produced in late summer to fall.
Muehlenbeckia australis, the large-leaved muehlenbeckia or pohuehue, is a prostrate or climbing plant native to New Zealand.
Acacia maconochieana, also known as Mullan wattle, is a shrub or tree of the genus Acacia and the subgenus Plurinerves that is endemic to an arid area of central Australia.
Reynoutria is a genus of flowering plants in the family Polygonaceae. The genus is native to eastern China, Eastern Asia and the Russian Far East, although species have been introduced to Europe and North America. Members of the genus, including R. japonica and its hybrid with R. sachalinensis, are highly invasive plants.
Polygonoideae is a subfamily of plants in the family Polygonaceae. It includes a number of plants that can be highly invasive, such as Japanese knotweed, Reynoutria japonica, and its hybrid with R. sachalinensis, R. × bohemica. Boundaries between the genera placed in the subfamily and their relationships have long been problematic, but a series of molecular phylogenetic studies have clarified some of them, resulting in the division of the subfamily into seven tribes.
Duma is a genus of shrubby flowering plants in the family Polygonaceae, subfamily Polygonoideae. The genus was separated from Muehlenbeckia in 2011. The native range of the genus is Australia.
Tanja Magdalena Schuster is a taxonomist from Austria, and the first Pauline Ladiges Plant Systematics Fellow, holding a joint position with the School of Biosciences, University of Melbourne, Victoria, Australia, and the National Herbarium of Victoria, Royal Botanic Gardens Melbourne. Schuster also worked as curator of the Norton-Brown Herbarium at the University of Maryland, College Park.
Phyla canescens is a species of perennial herbaceous plant in the family Verbenaceae, native to South America. It has been introduced to Australia as an ornamental plant and low-maintenance lawn, but has become naturalised and is considered a serious environmental weed. It is known by several common names including carpet weed, Condamine couch, Condamine curse, fog fruit, frog fruit, hairy fogfruit, lippia, mat grass and no-mow grass.