Alnus comprises robust deciduous trees and sizable shrubs characterized by their rounded foliage and, during winter, noticeable catkins.

Alnus incana subsp. incana

Alnus incana subsp. rugosa

Alnus incana subsp. tenuifolia

Alnus inokumae is a rapidly growing deciduous tree that can reach heights of up to 30 meters. Its leaves measure approximately 8 centimeters in length and exhibit an oval form, featuring a green upper surface and a downy cream underside before they drop in autumn. In late winter, the tree produces male catkins, which cluster together and measure around 8 centimeters. The female cones, which are woody, remain attached to the branches throughout the winter months.

Alnus inokumae

Alnus japonica

Alnus japonica var. arguta

A nearly evergreen tree that reaches heights of up to 25 meters, this species maintains its foliage throughout the winter months, shedding leaves in spring to quickly grow new ones. The leaves display a vibrant green hue, characterized by widely spaced serrations and an elongated shape. In spring, male catkins appear in a creamy color, while female woody cones develop by autumn. This tree can be pruned into a hedge and is suitable for pleaching, allowing for a distinct trunk.

Alnus jorullensis

Alnus kamtschatica

Alnus lanata

Alnus maritima

Alnus maritima subsp. maritima

Alnus maritima subsp. metoporina

Alnus maritima var. obtusata

Alnus matsumurae

Alnus maximowiczii

Alnus maximowiczii from Ulleungdo, South Korea

Alnus nepalensis is a rapidly growing deciduous tree that can reach heights of up to 30 meters. Its leaves are a deep green on the upper side and lighter underneath, measuring around 18 centimeters in length, and they do not change color in the fall. In autumn, long cream-colored male catkins appear, hanging in large clusters. The female cones, which are woody, form later and are positioned upright in clusters on the bare branches.

Alnus nepalensis

Alnus nipponica

Alnus nitida

Alnus oblongifolia

Alnus orientalis

Alnus orientalis var. orientalis TURX 94

A small, multi-stemmed tree or shrub, Alnus pendula typically reaches heights of up to 8 meters and spreads about 5 meters wide. Its branches exhibit a weeping habit, creating a distinctive silhouette. The leaves are robust, glossy green, and may occasionally reveal their lighter, fuzzy undersides. In spring, male catkins emerge, followed in autumn by the development of woody female cones.

Alnus pendula

Alnus relatus

Alnus rhombifolia

Alnus rubra is a medium-sized, fast-growing tree that can reach heights of approximately 19 meters. It features a narrow, pyramidal crown with branches that tend to droop. The leaves are large and lobed, displaying a dark green color on the upper side and a greyish hue underneath. Male catkins can grow up to 15 centimeters in length, while the tree's fruits are barrel-shaped and measure around 1.5 centimeters long.

Alnus rubra

Alnus rubra f. pinnatisecta

Alnus serrulata is a deciduous shrub that often grows in a multi-stemmed form, capable of creating dense thickets. Its leaves are thick and green, lacking any notable autumn coloration and remaining on the plant until they turn green before dropping. In winter, the upright catkins develop a deep red hue, adding visual interest. The small female flowers mature into clusters that form durable wooden cones.

Alnus serrulata

Alnus serrulata 'Panbowl'

Alnus sieboldiana is a medium-sized deciduous tree or shrub that typically reaches heights of up to 12 meters. Its foliage consists of green leaves with lighter undersides, featuring serrated margins and prominent veins. The male catkins are robust and yellow, while the female reproductive structures resemble woody cones, measuring 2-3 centimeters in length, and are found individually during the autumn and winter months.

Alnus sieboldiana

Alnus spectabilis

Alnus subcordata is a rapidly growing, medium-sized tree characterized by its conical form. It features glossy, broadly heart-shaped leaves that are mid-green and have serrated margins. The bark is brown-grey and fissured, offering visual interest throughout the year. This species produces elongated male catkins that hang down, as well as shorter, upright female catkins, which are succeeded by woody fruit. It can thrive in poor or waterlogged soils.

Alnus subcordata

Alnus trabeculosa

Alnus ullungdoensis is a sizable, rapidly growing tree that can reach heights of up to 15 meters. It features large, oval leaves with long serrations, displaying a vivid green color. During the transition from winter to spring, it produces numerous yellow catkins, which can grow as long as 10 centimeters.

Alnus ullungdoensis

Alnus x aschersoniana

Alnus x elliptica

Alnus x hybrida

Alnus x koehnei

Alnus x pubescens var. americana

Alnus x purpusii

Alnus x silesiaca

Alnus x spaethii is a robust, rapidly growing tree that typically reaches heights exceeding 12 meters. It has a conical shape and produces large, elongated leaves with serrated edges, which exhibit a purplish tint during their early development. In spring, the tree showcases clusters of yellow catkins. This species is well-suited for expansive areas or urban streetscapes.

Alnus x spaethii

Alnus yunnanensis

Betula comprises both deciduous trees and shrubs, known for their vibrant autumn foliage and distinctive bark that can be white, pink, or brown and peeling. In spring, male and female catkins emerge separately, preceding or coinciding with leaf growth.

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