''Achyranthes margaretarum'' is a species of
plant
Plants are the eukaryotes that form the Kingdom (biology), kingdom Plantae; they are predominantly Photosynthesis, photosynthetic. This means that they obtain their energy from sunlight, using chloroplasts derived from endosymbiosis with c ...
belonging to the family
Amaranthaceae
Amaranthaceae ( ) is a family of flowering plants commonly known as the amaranth family, in reference to its type genus '' Amaranthus''. It includes the former goosefoot family Chenopodiaceae and contains about 165 genera and 2,040 species, maki ...
. It is
endemic
Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...
to
Phillip Island
Phillip Island (Boonwurrung language, Boonwurrung: ''Corriong'', ''Worne'' or ''Millowl'') is an Australian island about south-southeast of Melbourne, Victoria (Australia), Victoria. The island is named after Arthur Phillip, Governor Arthur P ...
, close to
Norfolk Island
Norfolk Island ( , ; ) is an States and territories of Australia, external territory of Australia located in the Pacific Ocean between New Zealand and New Caledonia, directly east of Australia's Evans Head, New South Wales, Evans Head and a ...
in the south west
Pacific Ocean
The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...
, where it was discovered during the 1980s after rabbits had been eradicated from the island. This provides dramatic evidence of the value of the eradication program. It is considered critically endangered due to its very small population size – fewer than 20 mature individuals were known, in a single location on Phillip Island, in 2003.
[ In 2009 Mills identified 22 plants on Phillip Island, including planted specimens, only nine higher than 50 cm.
This plant is similar to '' Achyranthes arborescens'', an endemic from neighbouring Norfolk Island, but is a smaller, more compact ]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 up to 2m tall with a 2m spread. ''A. margaretarum'' also differs in having small, rather fleshy, bronze-green 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, ...
with yellow veins; small, erect inflorescence
In botany, an inflorescence is a group or cluster of flowers arranged on a plant's Plant stem, stem that is composed of a main branch or a system of branches. An inflorescence is categorized on the basis of the arrangement of flowers on a mai ...
s carrying just a few maroon-coloured 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; and small top
Top most commonly refers to:
* Top, a basic term of orientation, distinguished from bottom, front, back, and sides
* Spinning top, a ubiquitous traditional toy
* Top (clothing), clothing designed to be worn over the torso
* Mountain top, a moun ...
-shaped (rather than cylindrical) fruit
In botany, a fruit is the seed-bearing structure in flowering plants (angiosperms) that is formed from the ovary after flowering.
Fruits are the means by which angiosperms disseminate their seeds. Edible fruits in particular have long propaga ...
.[Mills, Kevin. ''The Vegetation of Phillip Island, Norfolk Island Group''. Report for Envirofund 2007-08. 2009]
References
*
margaretarum
Plants described in 2001
{{Amaranthaceae-stub