Alnus incana, the grey alder, tag alder or speckled alder, is a species of multi-stemmed, shrubby tree in the birch family, with a wide range across the cooler parts of the Northern Hemisphere. Tolerant of wetter soils, it can slowly spread with runners and is a …

Jun 4, 2023 · Alnus incana subsp. kolaensis is a tree of northernmost Europe, where it is sympatric with the nominate subspecies but restricted to subalpine and arctic regions.

Alnus incana (L.) Moench subsp. tenuifolia (Nutt.) Breitung, thinleaf alder [120, 167, 179, 192, 355] European gray alder, Alnusincana (L.) Moench subsp. incana, is native to western Europe [120, 127]. It has been introduced in the northeastern United States [231].

Native shrubs and (less commonly) small trees growing to 10 m tall, thicket-forming, with open crowns. The bark is gray, reddish, or brown, thin and smooth, becoming broken into irregular plates, often with conspicuous whitish lenticels (spongy openings for gas exchange).

Alnus incana, commonly called European gray alder, is a large pyramidal tree that grows to 40-60' tall. It is native to Europe and the Caucasus. Genus name is the Latin name for alder. Specific epithet means gray or hoary in reference to leaf color. Canker can be severe. Powdery mildew and leaf curl may appear.

The Grey Alder is botanically called Alnus incana. The Tree is a deciduous tree, it will be 8 - 20 m (26 - 66 ft) high. The leaves are ovoid and the flowers are yellow. The tree likes Sun to half-shade at the location and the soil should be sandy-loamy to loamy.

Subsp. rugosa, synonymous with and formerly known as Alnus rugosa, is a fast-growing, thicket forming, deciduous, spreading small tree or shrub that is native to wet sandy or gravelly soils, often along the peripheries of lakes, ponds, streams, rivers and swamps, from Hudson Bay to Newfoundland south to Minnesota, Michigan and Virginia.

Speckled alder is most often seen in a multi-trunked form with a broad-rounded irregular crown. The bark of these trees is brown to reddish-brown to grayish, with scattered white lenticels. Older bark is grayish to reddish-brown with pale horizontal lenticels. Leaves are alternate, simple, and egg-shaped with acuminate tips.

A conical tree, to 20m, with dark-green leaves to 10cm long, grey-white and hairy beneath. Yellow-brown male catkins in pendent clusters of 3 or 4 are produced in late winter or early spring, before the leaves.

The thin bark of speckled alder is speckled with pores (called lenticels), hence its common name. It often forms very dense thickets around wetlands and streams. The yields of timber-producing trees such as ash, tupelo, and poplar are increased when they grow with speckled alder and can share in the nitrogen fixed by the alders bacterial partner.