Leichhardtia Mackeeorum
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''Leichhardtia mackeeorum'',
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 ...
''Marsdenia mackeeorum'', is a species of
vine A vine is any plant with a growth habit of trailing or scandent (that is, climbing) stems, lianas, or runners. The word ''vine'' can also refer to such stems or runners themselves, for instance, when used in wicker work.Jackson; Benjamin; Da ...
in the family
Apocynaceae Apocynaceae (, from '' Apocynum'', Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison. Notable mem ...
. 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
New Caledonia New Caledonia ( ; ) is a group of islands in the southwest Pacific Ocean, southwest of Vanuatu and east of Australia. Located from Metropolitan France, it forms a Overseas France#Sui generis collectivity, ''sui generis'' collectivity of t ...
.


Description

''Leichhardtia mackeeorum'' is a slender twining vine growing to 3 m. It has white latex. The smooth leaves are differently coloured on their upper and lower surfaces ( discolorous), on petioles (stems) which are long. They are linear to elliptic and long by wide, rounded at the base and pointed at the tip, and have revolute margins. Vegetatively, this species differs little from '' Marsdenia microstoma'', but is distinguished from it by its bostrychoid inflorescence on a
rachis In biology, a rachis (from the [], "backbone, spine") is a main axis or "shaft". In zoology and microbiology In vertebrates, ''rachis'' can refer to the series of articulated vertebrae, which encase the spinal cord. In this case the ''rachi ...
which continues to grow and flower, whereas ''M. microstoma'' has a different inflorescence type and all the flowers on it open at the same time.


Taxonomy

The species was first described in 2017 as ''Marsdenia mackeeorum''. The
specific epithet In Taxonomy (biology), taxonomy, binomial nomenclature ("two-term naming system"), also called binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin gramm ...
, ''mackeeorum'' (), honours Hugh Shaw MacKee and his wife, Margaret. Hugh MacKee collected the type specimen in
Grande-Terre Grande Terre or Grande-Terre (, French for "large land") is a generic term used in French to designate the main island of any given archipelago. As a specific toponym, it may refer to the following: * Grande-Terre, Guadeloupe, the eastern half of ...
, South Province, Yaté, Gouemba,
New Caledonia New Caledonia ( ; ) is a group of islands in the southwest Pacific Ocean, southwest of Vanuatu and east of Australia. Located from Metropolitan France, it forms a Overseas France#Sui generis collectivity, ''sui generis'' collectivity of t ...
at an altitude of , on March 22, 1981
holotype P00607333
isotype P00607334). In 2020, the same authors transferred the species to the genus '' Leichhardtia''.


Conservation status

Some of the localities in which it is found are under threat of mining, and bushfires are a threat to the populations in the maquis vegetation, With an
extent of occurrence Extent may refer to: Computing * Extent (file systems), a contiguous region of computer storage medium reserved for a file * Extent File System, a discontinued file system implementation named after the contiguous region * Extent, a chunk of st ...
(EOO) of , and an
area of occupancy Area is the measure of a region's size on a surface. The area of a plane region or ''plane area'' refers to the area of a shape or planar lamina, while ''surface area'' refers to the area of an open surface or the boundary of a three-dimen ...
(AOO) of , it satisfies the criteria for it to be declared vulnerable under the IUCN criteria of 2012.


References


External links


''Marsdenia mackeeorum'' Meve, Gâteblé & Liede, endemia.nc Flore et Faune de Nouvelle-Calédonie.''Marsdenia mackeeorum'' GBIF Images of specimens, map
{{Taxonbar, from1=Q123426486, from2=Q61742052 Asclepiadoideae Endemic flora of New Caledonia Plants described in 2017 Taxa named by Gildas Gâteblé Taxa named by Ulrich Meve Taxa named by Sigrid Liede-Schumann