The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is an inventory of the global conservation status and extinction risk of biological species. A series of Regional Red Lists, which assess the risk of extinction to species within a political management unit, are also produced by countries and organizations.
Polemonium, commonly called Jacob's ladders or Jacob's-ladders, is a genus of between 25 and 40 species of flowering plants in the family Polemoniaceae, native to cool temperate to arctic regions of the Northern Hemisphere. One species, Polemonium micranthum, also occurs in the southern Andes in South America. Many of the species grow at high altitudes, in mountainous areas. Most of the uncertainty in the number of species relates to those in Eurasia, many of which have been synonymized with Polemonium caeruleum.
The rainbow darter is a small species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is native to North America where it is found in small, fast-moving streams and small to medium-sized rivers. It grows to 2 to 3 inches in length. The species is very sensitive to pollution and silt, staying in clean, pollution-free water. The rainbow darter is easily identified by three dark spots on the back, and blue and orange in the dorsal and anal fins.
Polemonium caeruleum, known as Jacob's-ladder or Greek valerian, is a hardy perennial flowering plant. The plant produces cup-shaped, blue or white flowers. It is native to temperate regions of Europe. It is the type species of the phlox family, Polemoniaceae.
Allium caeruleum is an ornamental bulbous plant of the onion genus, native to Central Asia. In these regions, it is found on dry slopes, plains, and steppes.
Zygocarpum caeruleum is a species of flowering plant in the family Fabaceae. It is found only in Yemen. Its natural habitats are subtropical or tropical dry forests and subtropical or tropical dry shrubland.
Hypericum scopulorum is a species of flowering plant in the family Hypericaceae. It is endemic to Socotra, an island archipelago that is part of Yemen. It is a common plant in shrubland habitat, and it is a dominant species in some areas along with Cephalocroton and another local endemic, Libinhania rosulata.
Exacum affine, known commercially as the Persian violet, is a species of plant in the family Gentianaceae. It is endemic to Socotra, part of Yemen, though its popularity and cultivation around the world have made it an occasional greenhouse weed. Its natural habitat is rocky areas. This is a small herbaceous biennial plant with dark green, ovate leaves. The small purple flowers have a yellow centre with fragrance.
Exacum is a genus of plant in family Gentianaceae. It contains 75 species native to tropical regions of sub-Saharan Africa, southern Arabian Peninsula, south and southeast Asia, New Guinea, and Australia.
Exacum socotranum is a species of flowering plant in the family Gentianaceae. It is an annual endemic to the island of Socotra in Yemen. It grows near seepages on vertical cliffs of the island's southwestern limestone escarpment. According to the International Union for Conservation of Nature, the species is currently critically endangered due to water diversion and housing development in its habitat.
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.
Hydnellum caeruleum, commonly known as the blue-gray hydnellum, blue-green hydnellum, blue spine, blue tooth, or bluish tooth, is an inedible fungus found in North America, Europe, and temperate areas of Asia.
Terana caerulea, commonly known as the cobalt crust fungus or velvet blue spread, is a saprobic crust fungus in the family Phanerochaetaceae. Usually found in warm, damp hardwood forests on the undersides of fallen logs and branches of deciduous trees, this unique fungus has been described as "blue velvet on a stick". This species was chosen as fungus of the year for 2009 by the German Mycological Society.
Sedum caeruleum, commonly known as the azure stonecrop, sky stone-crop, baby-blue stone-crop or red-leaf, is a species of Sedum from the family Crassulaceae. It is native to Algeria, Morocco, Tunisia, Sardinia, Corsica, and Sicily. The plant is a short, bushy annual with pale blue flowers. The leaves are succulent, narrowly oblong, and usually tinted red.
Trachelium caeruleum, common name blue throatwort, is a species of flowering plant in the family Campanulaceae native to the Mediterranean, where its native range includes Algeria, Morocco, Portugal, Spain, and Sicily. It has also become naturalized in a few areas, including New Zealand, the Azores, and parts of mainland Europe.
Trachelium is a genus of flowering plants in the family Campanulaceae.
Conospermum caeruleum, commonly known as blue brother, is a species of flowering plant in the family Proteaceae and is endemic to the south west of Western Australia. It is a prostrate shrub with small, dense heads of blue, rarely pink flowers and usually grows in heavy soils subject to flooding.
Exacum tetragonum, the bicolor Persian violet, is a species of plant in the family Gentianaceae. Its natural habitat is subtropical or tropical moist grassy forests, and it blooms in late monsoon. The plant likely is pollinated mainly by butterflies and other insects.
Memecylon caeruleum is a shrub or tree species in the Melastomataceae family. It is found from New Guinea, west through Southeast Asia to Tibet, Zhōngguó/China. It has become an invasive weed in the Seychelles. It has some local use for wood and food.
