Duma Florulenta
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''Duma florulenta'' (
synonym A synonym is a word, morpheme, or phrase that means precisely 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 Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...
. 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 In horticulture, the term perennial ('' per-'' + '' -ennial'', "through the year") is used to differentiate a plant from shorter-lived annuals and biennials. It has thus been defined as a plant that lives more than 2 years. The term is also ...
,
dioecious Dioecy ( ; ; adj. dioecious, ) is a characteristic of certain species that have distinct unisexual individuals, each producing either male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproduction is ...
shrub A shrub or 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 by their multiple ...
, 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 a principal appendage of the stem of a vascular plant, usually borne laterally above ground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, stem, ...
are 15–70 mm long and 2–10 mm wide. The grey-green stems often end in a sharp point. The
flower Flowers, also known as blooms and blossoms, are the reproductive structures of flowering plants ( angiosperms). Typically, they are structured in four circular levels, called whorls, around the end of a stalk. These whorls include: calyx, m ...
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, Male Flowers Muehlenbeckia florulenta DSC 1381.jpg, habitat,
Macquarie Marshes The Macquarie Marshes comprise the wetlands associated with the floodplains of the Macquarie River and its tributaries, in northern New South Wales, Australia. The Macquarie River and the marshes eventually drain into the Darling River. The m ...
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 northern Riverina region of western New South Wales, Australia. In the 2021 Census, West Wyalong's population was 3,037. Located west of Sydney as well as being above sea level, it i ...
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 (chemistry), 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 dimensio ...
and
drought A drought is a period of 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, ...
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 seabi ...
s, though it can also provide refuge for pest species such as
feral pig A feral pig is a domestic pig The pig (''Sus domesticus''), also called swine (: swine) or hog, is an omnivorous, domesticated, even-toed, hoofed mammal. It is named the domestic pig when distinguishing it from other members of the g ...
s,
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 ("brush"). Twelve species ...
es and
rabbit Rabbits are small mammals in the family Leporidae (which also includes the hares), which is in the order Lagomorpha (which also includes pikas). They are familiar throughout the world as a small herbivore, a prey animal, a domesticated ...
s.


Taxonomy

The species was first described by
Carl Meisner Carl Daniel Friedrich Meissner (1 November 1800 – 2 May 1874) was a Swiss botanist. Biography Born in Bern, Switzerland on 1 November 1800, he was christened Meisner but later changed the spelling of his name to Meissner. For most of his 40 ...
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 A duma () is a Russian assembly with advisory or legislative functions. The term ''boyar duma'' is used to refer to advisory councils in Russia from the 10th to 17th centuries. Starting in the 18th century, city dumas were formed across Russia ...
'', 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. Floodplains stretch from the banks of a river channel to the base of the enclosing valley, and experience flooding during periods of high Discharge (hydrolog ...
s,
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 ...
s,
gilgai A gilgai is a small, ephemeral lake formed from a surface depression in expanding clay soils. Gilgai is also used to refer to the overall micro-relief in such areas, consisting of mounds and depressions. The name comes from an Australian Aborigin ...
s and other intermittently flooded areas. In southern Australia it is often associated with stands of
river red gum ''Eucalyptus camaldulensis'', commonly known as river red gum, is a flowering plant in the family Myrtaceae, and is endemic to Australia. It is a tree with smooth white or cream-coloured bark, lance-shaped or curved adult leaves, flower buds in ...
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 ...
.


Aboriginal uses

During the long period when the Australian government took children from their aboriginal parents (see
Stolen generations The Stolen Generations (also known as Stolen Children) were the children of Aboriginal Australians, Australian Aboriginal and Torres Strait Islanders, Torres Strait Islander descent who were removed from their families by the Australian Gover ...
), 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 ...
people hid themselves and their children within the dense tangle of these plants so that the police could not find them.


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 (state) Eudicots of Western Australia Plants described in 1856 Taxa named by Carl Meissner