Populus is a genus of 25–30 species of deciduous flowering plants in the family Salicaceae, native to most of the Northern Hemisphere. English names variously applied to different species include poplar, aspen, and cottonwood.
Populus section Aigeiros is a section of three species in the genus Populus, the poplars. Like some other species in the genus Populus, they are commonly known as cottonwoods. The species are native to North America, Europe, and western Asia. In the past, as many as six species were recognized, but recent trends have been to accept just three species, treating the others as subspecies of P. deltoides.
Populus nigra, the black poplar, is a species of cottonwood poplar, the type species of section Aigeiros of the genus Populus, native to Europe, southwest and central Asia, and northwest Africa.
Populus alba, commonly called silver poplar, silverleaf poplar, or white poplar, is a species of poplar, most closely related to the aspens. It is native to Morocco and the Iberian Peninsula through central Europe to central Asia. It grows in moist sites, often by watersides, in regions with hot summers and cold to mild winters.
White poplar is a common name used to refer to several trees in the genus Populus:
Terminalia elliptica is a species of Terminalia native to southern and southeast Asia in India, Nepal, Bangladesh, Myanmar, Thailand, Laos, Cambodia, and Vietnam., It is a prominent part of both dry and moist deciduous forests in southern India up to 1000 m.
Populus tremuloides is a deciduous tree native to cooler areas of North America, one of several species referred to by the common name aspen. It is commonly called quaking aspen, trembling aspen, American aspen, mountain or golden aspen, trembling poplar, white poplar, and popple, as well as others. The trees have tall trunks, up to 25 meters tall, with smooth pale bark, scarred with black. The glossy green leaves, dull beneath, become golden to yellow, rarely red, in autumn. The species often propagates through its roots to form large clonal groves originating from a shared root system. These roots are not rhizomes, as new growth develops from adventitious buds on the parent root system.
Populus deltoides, the eastern cottonwood or necklace poplar, is a cottonwood poplar native to North America, growing throughout the eastern, central, and southwestern United States, the southernmost part of eastern Canada, and northeastern Mexico.
Populus tremula, commonly called aspen, common aspen, Eurasian aspen, European aspen, or quaking aspen, is a species of poplar native to cool temperate regions of Europe and Asia, from Iceland and the British Isles east to Kamchatka, north to inside the Arctic Circle in Scandinavia and northern Russia, and south to central Spain, Turkey, the Tian Shan, North Korea, and northern Japan. It also occurs at one site in northwest Africa in Algeria. In the south of its range, it occurs at high altitudes in mountains.
Populus balsamifera, commonly called balsam poplar, bam, bamtree, eastern balsam-poplar, hackmatack, tacamahac poplar, tacamahaca, is a tree species in the balsam poplar species group in the poplar genus, Populus. The genus name Populus is from the Latin for poplar, and the specific epithet balsamifera from Latin for "balsam-bearing".
Populus grandidentata, commonly called large-tooth aspen, big-tooth aspen, American aspen, Canadian poplar, or white poplar, is a deciduous tree native to eastern North America.
Aspen is a common name for certain tree species; some, but not all, are classified by botanists in the section Populus, of the Populus genus.
Populus lasiocarpa, commonly called the Chinese necklace poplar, is a species of poplar native to humid forests of China. It is closely related to Populus wilsonii, Wilson's poplar.
Entoleuca mammata is a species of fungus in the genus Entoleuca. It is responsible for the plant disease hypoxylon canker in hardwood trees such as quaking aspen and other aspens and poplars, Salix myrsinifolia and other willow species, rowan, Sitka alder, birch, apple, oak, and hop-hornbeam.
Populus × jackii is the hybrid between balsam poplar, Populus balsamifera, and the eastern cottonwood, Populus deltoides, occurring occasionally where the two parental species' ranges overlap. It is sometimes called a cottonwood. This hybrid is also sometimes planted as a shade tree, and occasionally escapes from cultivation. This hybrid is also known by the synonyms Populus × andrewsii Sargent, P. × bernardii Boivin, Populus candicans W. Aiton, P. × dutillyi Lepage, P. × generosa Henry, P. × gileadensis Rouleau, and P. manitobensis Dode.
Populus × canescens, the grey poplar, is a hybrid between Populus alba and Populus tremula. It is intermediate between its parents, with a thin grey downy coating on the leaves, which are also much less deeply lobed than the leaves of P. alba. It is a very vigorous tree with marked hybrid vigour, reaching 40 m tall and with a trunk diameter over 1.5 m – much larger than either of its parents. Most trees in cultivation are male, but female trees occur naturally and some of these are also propagated.
