The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biological species. It uses a set of precise criteria to evaluate the extinction risk of thousands of species and subspecies. These criteria are relevant to all species and all regions of the world. With its strong scientific base, the IUCN Red List is recognized as the most authoritative guide to the status of biological diversity. A series of Regional Red Lists are produced by countries or organizations, which assess the risk of extinction to species within a political management unit.
An IUCN Red List Critically Endangered (CR) species is one that has been categorized by the International Union for Conservation of Nature as facing an extremely high risk of extinction in the wild. As of 2021, of the 120,372 species currently tracked by the IUCN, there are 8,404 species that are considered to be Critically Endangered.
A species that is extinct in the wild (EW) is one that has been categorized by the International Union for Conservation of Nature as known only by living members kept in captivity or as a naturalized population outside its historic range due to massive habitat loss.
Helicia is a genus of 110 species of trees and shrubs, constituting part of the plant family Proteaceae. They grow naturally in rainforests throughout tropical South and Southeast Asia, including India, Sri Lanka, Indochina, Peninsular Malaysia to New Guinea and as far south as New South Wales.
Helicia australasica, also named Austral oak or creek silky oak, is a species of rainforest trees from the flowering plant family Proteaceae.
Protea comptonii, also known as saddleback sugarbush, is a smallish tree of the genus Protea in the family Proteaceae. It is found in South Africa and Eswatini.
Eidothea hardeniana, commonly named nightcap oak, is a species of tree, up to 40 m (130 ft) tall, of the plant family Proteaceae, which botanist Robert Kooyman recognised as a new species only recently in 2002. The species has an official listing as critically endangered on the Australian Commonwealth EPBC Act and as Endangered on the NSW Threatened Species Act. The name hardeniana honours the botanist Gwen Harden. Phylogenetics studies now suggest it represents a basal branch of the Proteoid clade of the Proteaceae.
Leucadendron album is a species of flowering plant in the family Proteaceae that grows in South Africa.
Plocama is a genus of flowering plants in the family Rubiaceae. It was described by William Aiton in 1789. It is distributed from the Canary Islands to northwestern India.
Plocama puberula is a species of flowering plant in the family Rubiaceae. It is endemic to the Socotra archipelago of Yemen. Its natural habitat is rocky areas.
Plocama tinctoria is a species of flowering plant in the family Rubiaceae. It is endemic to northern Somalia and the Socotra archipelago of Yemen. Its natural habitat is subtropical or tropical dry forests. It is listed by the IUCN as a threatened species under the basionym Gaillonia tinctoria.
Helicia blakei, also named Blake's silky oak, is a species of rainforest tree, of northeastern Queensland, Australia, from the flowering plant family Proteaceae.
Helicia nortoniana, also named Norton's silky oak, is a species of rainforest trees, of northeastern Queensland, Australia, from the flowering plant family Proteaceae.
Hollandaea porphyrocarpa is a species of small Australian rainforest tree in the plant family Proteaceae. It is endemic to restricted areas of the rainforests of the Wet Tropics region of northeastern Queensland.
Melaleuca thymoides is a plant in the myrtle family, Myrtaceae, and is endemic to the south-west of Western Australia. It is usually a low shrub. The ends of the branches usually end in a sharp spine and the leaves also have a sharp point. Bright yellow flowers appear on the ends of the branches in spring or early summer.
Protea asymmetrica, also known as the Inyanga sugarbush, is a flowering plant, named for its asymmetric flowerheads, of the family Proteaceae and endemic to Zimbabwe and the Nyanga region, where it grows in grasslands, as well as Mount Nyangani.
Protea acuminata, also known in English as the black-rim sugarbush, or in the Afrikaans language as sederbergsuikerbos, is a flowering shrub belonging to the genus Protea. The plant is endemic to South Africa. There are isolated populations at Nieuwoudtville, and in the Cederberg, Stettynskloof and Riviersonderend Mountains. It can grow as an upright tree. It can become up to two metres in height. It blooms from June to September, with the peak of July to August. Periodic wildfires may destroy the adult plants, but the seeds can survive such an event. The seeds are dispersed by means of the wind. The plant is monoecious with both sexes in each flower. It is unknown what causes the pollination to occur. The plant grows in sandy plains and coastal lowlands from sea-level to altitudes of 400 metres. It is a widespread species which is not in danger, and the conservation status has been assessed as 'least concern'.
Protea nubigena, commonly known as cloud sugarbush, is a very rare species of a flowering shrub belonging to the Protea genus. It is endemic to KwaZulu-Natal, South Africa and is found in the uKhahlamba Basalt Grassland within the Royal Natal National Park, near Mont-Aux-Sources, at an altitude of about 2,250 metres (7,380 ft) in well-drained, humus-rich soil on shaded slopes.
Protea scabriuscula, also known as the hoary sugarbush or gray sugarbush, is a flowering shrub, endemic to the southwestern Cape Region of South Africa.
