Salix retusa | |
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Salix retusa at the Giardino Botanico Alpino Chanousia | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Rosids |
Order: | Malpighiales |
Family: | Salicaceae |
Genus: | Salix |
Species: | S. retusa |
Binomial name | |
Salix retusa | |
Salix retusa is a species of flowering plant in the family Salicaceae.
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. While these definitions may seem adequate, when looked at more closely they represent problematic species concepts. For example, the boundaries between closely related species become unclear with hybridisation, in a species complex of hundreds of similar microspecies, and in a ring species. Also, among organisms that reproduce only asexually, the concept of a reproductive species breaks down, and each clone is potentially a microspecies.
The flowering plants, also known as angiosperms, Angiospermae or Magnoliophyta, are the most diverse group of land plants, with 64 orders, 416 families, approximately 13,000 known genera and 300,000 known species. Like gymnosperms, angiosperms are seed-producing plants. However, they are distinguished from gymnosperms by characteristics including flowers, endosperm within the seeds, and the production of fruits that contain the seeds. Etymologically, angiosperm means a plant that produces seeds within an enclosure; in other words, a fruiting plant. The term comes from the Greek words angeion and sperma ("seed").
Family is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy; it is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as being the "walnut family".
Salix retusa can reach a height of 10–30 centimetres (3.9–11.8 in). This plant usually develops creeping stems, rarely erect. The dull green leaves are obovate, lanceolate or elliptic, with entire margins, 2 × 1 cm, with very short petioles. Like all willows this species is dioecious. Catkins are broadly cylindrical, with yellow anthers. Flowers bloom from June to July.
It is present in the mountains of central and southern Europe including the Pyrenees and the mountains of Bulgaria.
The Pyrenees is a range of mountains in southwest Europe that forms a natural border between Spain and France. Reaching a height of 3,404 metres (11,168 ft) altitude at the peak of Aneto, the range separates the Iberian Peninsula from the rest of continental Europe, and extends for about 491 km (305 mi) from the Bay of Biscay to the Mediterranean Sea.
Bulgaria, officially the Republic of Bulgaria, is a country in Southeast Europe. It is bordered by Romania to the north, Serbia and North Macedonia to the west, Greece and Turkey to the south, and the Black Sea to the east. The capital and largest city is Sofia; other major cities are Plovdiv, Varna and Burgas. With a territory of 110,994 square kilometres (42,855 sq mi), Bulgaria is Europe's 16th-largest country.
This species can be found in rock crevices and screes at elevation of 2,000–2,700 metres (6,600–8,900 ft) above sea level.
Willows, also called sallows and osiers, form the genus Salix, around 400 species of deciduous trees and shrubs, found primarily on moist soils in cold and temperate regions of the Northern Hemisphere. Most species are known as willow, but some narrow-leaved shrub species are called osier, and some broader-leaved species are referred to as sallow. Some willows are low-growing or creeping shrubs; for example, the dwarf willow rarely exceeds 6 cm (2.4 in) in height, though it spreads widely across the ground.
Salix caprea is a common species of willow native to Europe and western and central Asia.
Salix fragilis, with the common names crack willow and brittle willow, is a species of willow native to Europe and Western Asia. It is native to riparian habitats, usually found growing beside rivers and streams, and in marshes and water meadow channels.
Salix herbacea, the dwarf willow, least willow or snowbed willow, is a species of tiny creeping willow adapted to survive in harsh arctic and subarctic environments. Distributed widely in alpine and arctic environments around the North Atlantic Ocean, it is one of the smallest of woody plants.
Salix polaris, the polar willow, is a species of willow with a circumpolar distribution in the high arctic tundra, extending north to the limits of land, and south of the Arctic in the mountains of Norway, the northern Ural Mountains, the northern Altay Mountains, Kamchatka, and British Columbia, Canada.
Ficus retusa is a species of evergreen woody plant in the fig genus, native to the Malay Archipelago and Malesia floristic region. The species name has been widely mis-applied to Ficus microcarpa.
Salix reticulata, the net-leaved willow, or snow willow, is a dwarf willow, native to the colder parts of Europe, North America, and Northern Asia. It is found in the western United States, including the Sierra Nevada and Rocky Mountains. In Europe it extends south through the Carpathian Mountains and Alps to the Pyrenees and the mountains of Macedonia. It is common in Canada, Greenland and Finland, and present but rare in Scotland.
Salix lasiolepis is a species of willow native to western North America.
Salix triandra, with the common names almond willow or almond-leaved willow, is a species of willow native to Europe and Western and Central Asia. It is found from south-eastern England east to Lake Baikal, and south to Spain and the Mediterranean east to the Caucasus, and the Alborz Mountains. It usually grows in riparian habitats, on river and stream banks, and in wetlands.
Salix lanata, the woolly willow, is a subarctic species of willow native to Iceland, the Faeroes, northern Scandinavia, Finland, through to eastern Siberia. In Scotland it can be found in only a few localities of Perthshire, Angus and Aberdeen, generally on rocky mountain sides at altitudes between 600–900 m (1,969–2,953 ft).
Salix barrattiana is a species of flowering plant in the willow family known by the common name Barratt's willow. It is native to North America, where it is distributed across Alaska and western Canada, with also a few populations in Montana and Wyoming. These disjunct populations are probably relics from a time when the climate was colder. The southernmost population is technically in Wyoming, but it is located at the Montana state line and it is limited to one clone of all-staminate plants within an area of 100 m2 in a high-elevation habitat.
Salix geyeriana is a species of willow known by the common names Geyer's willow, Geyer willow and silver willow. The type specimen was collected by the botanist Karl Andreas Geyer, for whom it was named. Its conspicuous, yellow flowers begin to bloom as early as March, to as late as the end of June.
Salix gooddingii is a species of willow known by the common name Goodding's willow, or Goodding's black willow. It was named for its collector, Leslie Newton Goodding.
Salix richardsonii is a species of flowering plant in the Salicaceae, or willow family. It is known by the common names Richardson's willow and woolly willow. It is native to Russia and northern North America, where it occurs in Alaska and northern Canada.
Salix arizonica is a species of willow known by the common name Arizona willow. It is native to the southwestern United States, where it occurs in Arizona, Colorado, New Mexico, and Utah.
The Double Kidney is a moth of the Noctuidae family. It is found in most of Europe. In the east, the range extends through Turkey, Siberia, Mongolia and China to Korea and Japan. The habitat consists of damp marshy places.
Salix bicolor is a species of flowering plant in the family Salicaceae (willows).
Salix glaucosericea, common name silky willow or Alpine grey willow, is a species of flowering plant in the Salicaceae family.
Haworthia retusa is a species of flowering plants of the genus Haworthia in the family Asphodelaceae, endemic to a very small area around Riversdale, in the Western Cape Province in South Africa. Growing to 10 cm (3.9 in) tall and broad, it is a perennial succulent with thick triangular leaves and small white tubular flowers held in 50 cm (20 in) tall racemes.
Salix denticulata is a species of shrub or small tree in the family Salicaceae. It is a mountain species endemic to the Himalayan region.
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