Salix denticulata

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Salix denticulata
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Salicaceae
Genus: Salix
Species:S. denticulata
Binomial name
Salix denticulata
Andersson
Synonyms [1]

Salix elegans Wallich ex Andersson

Salix denticulata is a species of shrub or small tree in the family Salicaceae. It is a mountain species endemic to the Himalayan region.

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.

Family is one of the eight major hierarcical 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".

Salicaceae family of plants

The Salicaceae are a family, the willow family, of flowering plants. The traditional family included the willows, poplar, aspen, and cottonwoods. Recent genetic studies summarized by the Angiosperm Phylogeny Group have greatly expanded the circumscription of the family to contain 56 genera and about 1220 species, including Scyphostegiaceae and much of the former Flacourtiaceae.

Contents

Description

Salix denticulata can reach a height of 6 m (20 ft). The shoots are downy when young. The dull green leaves are paler underneath, obovate, lanceolate or elliptic, with toothed margins, 3.5 by 1.2 to 2.2 centimetres (1.38 by 0.47 to 0.87 in) long, with very short petioles. Like all willows this species is dioecious. Male catkins are 2.5 cm (1 in) long, with yellow anthers, and female catkins 4 centimetres (1.6 in) long, lengthening to 9 centimetres (3.5 in) in fruit. The flowers bloom in April and May. [2]

Petiole (botany)

In botany, the petiole is the stalk that attaches the leaf blade to the stem. Outgrowths appearing on each side of the petiole in some species are called stipules. Leaves lacking a petiole are called sessile or epetiolate.

Dioecy is a characteristic of a species, meaning that it has distinct male and female individual organisms. Dioecious reproduction is biparental reproduction. Dioecy is one method that excludes self-fertilization and promotes allogamy (outcrossing), and thus tends to reduce the expression of recessive deleterious mutations present in a population. Flowering plants have several other methods of excluding self-fertilization, called self-incompatibility.

Distribution

Salix denticulata is native to the mountainous regions of central Asia, being present in Afghanistan, Pakistan, Nepal, India and the Chinese provinces of Sichuan, Tibet and Yunnan. Its typical habitat is gullies and river valleys at around 2,500 m (8,200 ft). [2]

Sichuan Province

Sichuan, is a province in southwest China occupying most of the Sichuan Basin and the easternmost part of the Tibetan Plateau between the Jinsha River on the west, the Daba Mountains in the north, and the Yungui Plateau to the south. Sichuan's capital city is Chengdu. The population of Sichuan stands at 81 million.

Tibet Autonomous Region Autonomous region

The Tibet Autonomous Region (TAR) or Xizang Autonomous Region, called Tibet or Xizang for short, is a province-level autonomous region in southwest China. It was formally established in 1965 to replace the Tibet Area, an administrative division the People's Republic of China inherited from the Republic of China (ROC), about five years after the dismissal of the Kashag by the PRC following the 1959 Tibetan uprising, and about 13 years from the Tibet's incorporation into the PRC in 1951.

Yunnan Province

Yunnan is a province of the People's Republic of China. Located in Southwest China, the province spans approximately 394,000 square kilometres (152,000 sq mi) and has a population of 45.7 million. The capital of the province is Kunming, formerly also known as Yunnan. The province borders the Chinese provinces Guangxi, Guizhou, Sichuan, and the Tibet Autonomous Region, as well as the countries Vietnam, Laos, and Myanmar.

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References

  1. ↑ "Salix denticulata Andersson". The Plant List. 2010. Retrieved 7 November 2015.
  2. 1 2 "Salix denticulata Andersson". Flora of China. Retrieved 7 November 2015.
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