Английская Википедия:Didymocheton pettigrewianus

Содержание

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Didymocheton pettigrewianus, commonly known as spur mahogany, spurwood, or Cairns satinwood, is a large tree in the family Meliaceae. It is native to the rainforests of Malesia, Papuasia and Queensland. In Queensland it occurs only in a small part of the northeast coast.

Description

The spur mahogany may reach in excess of Шаблон:Cvt tall, with a trunk to Шаблон:Cvt wide.Шаблон:R It is known for its tall, branched and wandering buttress roots, which can reach up to Шаблон:Cvt in height and extend up to Шаблон:Cvt from the trunk.Шаблон:R The rough flaky bark is brown with numerous lenticels.Шаблон:R

The large whorled leaves are imparipinnate with between 7 and 15 leaflets. They can reach up to Шаблон:Cvt long with a petiole up to Шаблон:Cvt.Шаблон:R The petiole is sharply but very shortly winged and is swollen at its junction with the branch.Шаблон:R The leaflets vary in size, the proximal ones are relatively small and the distal ones larger. The terminal leaflet is the largest, measuring up to Шаблон:Cvt.Шаблон:R

The inflorescences are racemes or spikes to about Шаблон:Cvt long, produced on the twigs (or rarely in the leaf axils).Шаблон:R Appearing in December and January, they carry numerous small fragrant flowers which are sessile and creamy white in colour.Шаблон:R The flowers have four linear to spathulate petals to Шаблон:Cvt long and a distinctive staminal tube (i.e. a tube made up of fused stamens) which is slightly flared at the tip.Шаблон:R

The fruit are a more or less Шаблон:Botanygloss (i.e. pear-shaped) capsule up to Шаблон:Cvt wide by Шаблон:Cvt long. They are dark brown on the outside with a warty appearance. At maturity they split to reveal the orange coloured interior with up to four seeds.Шаблон:R

Taxonomy

The species was first described as Dysoxylum pettigrewianum by the colonial botanist of Queensland Frederick Manson Bailey. His description was based on specimens collected from "Scrubs at the base of Bellenden-Ker Range and the Barron River,"Шаблон:R and was published in Botany Bulletin. Department of Agriculture, Queensland 5: 9 in July 1892.Шаблон:R In 2021 a review of the genus Dysoxylum was published, finding that the group was polyphyletic (i.e. the most recent ancestor of the members was not the same for all members. As a result large scale changes were made to the genus, and this species was given the new combination Didymocheton pettigrewianus.Шаблон:R

Etymology

The species epithet was chosen by Bailey to honour the Brisbane businessman and politician William Pettigrew.Шаблон:R Bailey wrote: "After the Hon. William Pettigrew, who has always taken a deep interest in Queensland timbers."Шаблон:R

Distribution and habitat

In Australia Didymocheton pettigrewianus grows in well developed rainforest from just north of Hope Vale to the Paluma Range, just north of Townsville. It is also found in the Maluku Islands, New Guinea, and the Solomon Islands.Шаблон:R

It is found at altitudes from near sea level up to Шаблон:Cvt, reaching its best development in the lowlands on basalt soils.Шаблон:R

Ecology

The fruit are eaten by cassowaries (Casuarius spp.) who swallow the entire fruit, and by metallic starlings (Aplonis metallica), who extract and swallow just the seeds.Шаблон:R The leaves are eaten by Lumholtz's tree-kangaroo (Dendrolagus lumholtzi).Шаблон:R

The northern leaf-tailed gecko (Saltuarius cornutus) often hunts for prey in the scaly bark where it is well camouflaged.Шаблон:R

Conservation

This species is listed by Queensland's Department of Environment, Science and Innovation as least concern.Шаблон:R Шаблон:As of, it has not been assessed by the IUCN.

Uses

The timber of Didymocheton pettigrewianus is classified as a hardwood, with a specific gravity of Шаблон:Cvt.Шаблон:R It is red/brown in colour and is used as a general purpose and cabinet timber. It was once popular for boat building.Шаблон:R

Growing too large for the average garden, it is suitable for planting in parks and public gardens, making a useful shade tree. Young plants need shelter, and the species does best in a well-drained acidic soil.

Gallery

• Compound leaf

  Compound leaf

• Buttress roots and rough bark

  Buttress roots and rough bark

• Base of the petiole

  Base of the petiole

• Foliage

  Foliage

External links

• Шаблон:Wikispecies-inline
• Шаблон:Commons category-inline
• View a map of historical sightings of this species at the Australasian Virtual Herbarium
• View observations of this species on iNaturalist
• View images of this species on Flickriver