''Duma florulenta'' (

synonym A synonym is a word, morpheme, or phrase that means exactly or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are a ...

''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 The Wiradjuri people (; ) are a group of Aboriginal Australian people from central New South Wales, united by common descent through kinship and shared traditions. They survived as skilled hunter-fisher-gatherers, in family groups or clans, a ...

name for the plant is gweeargal, and the

Walmajarri The Walmadjari (Walmajarri) people, also known as Tjiwaling and Wanaseka, are an Aboriginal Australian people of the Kimberley region of Western Australia. Name The two names reflect different Walmadjari preferences. Their western bands accept ...

name is ''Kirinykiriny'', or ''Kurinykuriny''.

Description

Lignum is a

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...

monoecious Monoecy (; adj. monoecious ) is a sexual system in seed plants where separate male and female cones or flowers are present on the same plant. It is a monomorphic sexual system alongside gynomonoecy, andromonoecy and trimonoecy. Monoecy is conne ...

shrub A shrub (often also called a bush) is a small-to-medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees ...

, 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 A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, ste ...

are 15–70 mm long and 2–10 mm wide. The grey-green stems often end in a sharp point. The

flower A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants (plants of the division Angiospermae). The biological function of a flower is to facilitate reproduction, usually by providing a mechanis ...

s 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. File:Lignum foliage.jpg, Foliage File:Lignum blooms.jpg, Flowers Muehlenbeckia florulenta DSC 1381.jpg, habitat, Macquarie Marshes File:Duma florulentaPB161960.jpg, At most south-eastern edge of its distribution, north east of

West Wyalong West Wyalong is the main town of the Bland Shire in the Riverina region of New South Wales, Australia. Located west of Sydney and above sea level, it is situated on the crossroads of the Newell Highway between Melbourne and Brisbane, and the ...

Muehlenbeckia Lignum swamp.jpg, Lignum swamp, Narran Lake nature reserve 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. The plant has a very deep root system, penetrating the soil to at least 3 m in depth. It is highly tolerant of

salinity Salinity () is the saltiness or amount of salt dissolved in a body of water, called saline water (see also soil salinity). It is usually measured in g/L or g/kg (grams of salt per liter/kilogram of water; the latter is dimensionless and equal to ...

and

drought A drought is defined as drier than normal conditions.Douville, H., K. Raghavan, J. Renwick, R.P. Allan, P.A. Arias, M. Barlow, R. Cerezo-Mota, A. Cherchi, T.Y. Gan, J. Gergis, D. Jiang, A. Khan, W. Pokam Mba, D. Rosenfeld, J. Tierney, an ...

and may be used as an indicator of dryland soil salinity. Because of its densely tangled growth habit, it provides protected breeding habitat for native wildlife such as

waterbird A water bird, alternatively waterbird or aquatic bird, is a bird that lives on or around water. In some definitions, the term ''water bird'' is especially applied to birds in freshwater ecosystems, although others make no distinction from seab ...

s, though it can also provide refuge for pest species such as

feral pig The feral pig is a domestic pig which has gone feral, meaning it lives in the wild. They are found mostly in the Americas and Australia. Razorback and wild hog are Americanisms applied to feral pigs or boar-pig hybrids. Definition A feral p ...

fox Foxes are small to medium-sized, omnivorous mammals belonging to several genera of the family Canidae. They have a flattened skull, upright, triangular ears, a pointed, slightly upturned snout, and a long bushy tail (or ''brush''). Twelve sp ...

es and

rabbit Rabbits, also known as bunnies or bunny rabbits, are small mammals in the family Leporidae (which also contains the hares) of the order Lagomorpha (which also contains the pikas). ''Oryctolagus cuniculus'' includes the European rabbit specie ...

Taxonomy

The species was first described by Carl Meisner in 1856 as ''Muehlenbeckia florulenta''.

Molecular phylogenetic Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...

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''.

Distribution and habitat

Lignum occurs in all of Australia's mainland states, as well as the Northern Territory. The plant's preferred habitats include

floodplain A floodplain or flood plain or bottomlands is an area of land adjacent to a river which stretches from the banks of its channel to the base of the enclosing valley walls, and which experiences flooding during periods of high discharge.Goudi ...

swamp A swamp is a forested wetland.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p. Swamps are considered to be transition zones because both land and water play a role in ...

gilgai A gilgai is a small, ephemeral lake formed from a depression in the soil surface in expanding clay soils. Additionally, the term "gilgai" is used to refer to the overall micro-relief in such areas, consisting of mounds and depressions, not just th ...

s and other intermittently flooded areas. In southern Australia it is often associated with stands of

river red gum ''Eucalyptus camaldulensis'', commonly known as the river red gum, is a tree that is endemic to Australia. It has smooth white or cream-coloured bark, lance-shaped or curved adult leaves, flower buds in groups of seven or nine, white flowers a ...

and

black box In science, computing, and engineering, a black box is a system which can be viewed in terms of its inputs and outputs (or transfer characteristics), without any knowledge of its internal workings. Its implementation is "opaque" (black). The te ...

References

{{Taxonbar, from1=Q18081078, from2=Q1101419 Polygonoideae Caryophyllales of Australia Flora of New South Wales Flora of the Northern Territory Flora of Queensland Flora of South Australia Flora of Victoria (Australia) Eudicots of Western Australia Plants described in 1856 Taxa named by Carl Meissner