Lepidorrhachis
Encyclopedia
Lepidorrhachis is a monotypic
genus
of flowering plant
in the palm
family restricted to Lord Howe Island
. The genus name for the single, monoecious species
, Lepidorrhachis mooreana, comes from two Greek
word meaning "scale" and "rachis", and the epithet honors Charles Moore
, first director of the Sydney Botanical Gardens
. The common name is Little Mountain Palm.
is pinnate
, arching and ascending, with 60 cm lanceolate leaflets from medium to dark green, which may hang slightly pendent in maturity. The leaves, petioles, and rachises are lightly or densely covered in scales. The inflorescence
is short, thick, and much branched, and emerges at a node below the rudimentary crownshaft
; it bears both pistillate and staminate flower
s with three sepals and three petals. The fruit
, known to attract rats, is spherical or nearly so, colored red at maturity, with one seed
.
, they grow at high elevations, from 800 m and up, in the cloud forest
s of the Gower and Lidgbird mountains. Constantly cloaked in a cool, windy, extremely moist climate, they grow in any soil type but will not withstand frost.
Monotypic
In biology, a monotypic taxon is a taxonomic group with only one biological type. The term's usage differs slightly between botany and zoology. The term monotypic has a separate use in conservation biology, monotypic habitat, regarding species habitat conversion eliminating biodiversity and...
genus
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
of flowering plant
Flowering plant
The flowering plants , also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants. Angiosperms are seed-producing plants like the gymnosperms and can be distinguished from the gymnosperms by a series of synapomorphies...
in the palm
Arecaceae
Arecaceae or Palmae , are a family of flowering plants, the only family in the monocot order Arecales. There are roughly 202 currently known genera with around 2600 species, most of which are restricted to tropical, subtropical, and warm temperate climates...
family restricted to Lord Howe Island
Lord Howe Island
Lord Howe Island is an irregularly crescent-shaped volcanic remnant in the Tasman Sea between Australia and New Zealand, directly east of mainland Port Macquarie, and about from Norfolk Island. The island is about 11 km long and between 2.8 km and 0.6 km wide with an area of...
. The genus name for the single, monoecious species
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...
, Lepidorrhachis mooreana, comes from two Greek
Greek language
Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...
word meaning "scale" and "rachis", and the epithet honors Charles Moore
Charles Moore (botanist)
Charles Moore was an Australian botanist. He arrived in Sydney on 14 January 1848 and took up the position of Director of the Royal Botanic Gardens, Sydney, a position he held until 5 May 1896. In this time he undertook several trips in eastern New South Wales as a plant and seed collector.He...
, first director of the Sydney Botanical Gardens
Royal Botanic Gardens, Sydney
The Royal Botanic Gardens in Sydney, Australia, are the most central of the three major botanical gardens open to the public in Sydney....
. The common name is Little Mountain Palm.
Description
These small palms are solitary-trunked, reaching heights of 3.5 m at a 15 cm diameter; prominently ringed by leaf scars, the trunks are green at the base and usually grey nearing the crown. The 1.5 m leafLeaf
A leaf is an organ of a vascular plant, as defined in botanical terms, and in particular in plant morphology. Foliage is a mass noun that refers to leaves as a feature of plants....
is pinnate
Pinnate
Pinnate is a term used to describe feather-like or multi-divided features arising from both sides of a common axis in plant or animal structures, and comes from the Latin word pinna meaning "feather", "wing", or "fin". A similar term is pectinate, which refers to a comb-like arrangement of parts...
, arching and ascending, with 60 cm lanceolate leaflets from medium to dark green, which may hang slightly pendent in maturity. The leaves, petioles, and rachises are lightly or densely covered in scales. The inflorescence
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...
is short, thick, and much branched, and emerges at a node below the rudimentary crownshaft
Crownshaft
An elongated circumferential leaf base formation present on some species of palm is called a crownshaft.The leaf bases of some pinnate leaved palms form a sheath at the top of the trunk surrounding the bud where all the subsequent leaves are formed.The crownshaft...
; it bears both pistillate and staminate flower
Flower
A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants . The biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs...
s with three sepals and three petals. The fruit
Fruit
In broad terms, a fruit is a structure of a plant that contains its seeds.The term has different meanings dependent on context. In non-technical usage, such as food preparation, fruit normally means the fleshy seed-associated structures of certain plants that are sweet and edible in the raw state,...
, known to attract rats, is spherical or nearly so, colored red at maturity, with one seed
Seed
A seed is a small embryonic plant enclosed in a covering called the seed coat, usually with some stored food. It is the product of the ripened ovule of gymnosperm and angiosperm plants which occurs after fertilization and some growth within the mother plant...
.
Distribution and habitat
On Lord Howe IslandLord Howe Island
Lord Howe Island is an irregularly crescent-shaped volcanic remnant in the Tasman Sea between Australia and New Zealand, directly east of mainland Port Macquarie, and about from Norfolk Island. The island is about 11 km long and between 2.8 km and 0.6 km wide with an area of...
, they grow at high elevations, from 800 m and up, in the cloud forest
Cloud forest
A cloud forest, also called a fog forest, is a generally tropical or subtropical evergreen montane moist forest characterized by a persistent, frequent or seasonal low-level cloud cover, usually at the canopy level. Cloud forests often exhibit an abundance of mosses covering the ground and...
s of the Gower and Lidgbird mountains. Constantly cloaked in a cool, windy, extremely moist climate, they grow in any soil type but will not withstand frost.