Alnus viridisA.Gray 1848, illegitimate homonym, not (Chaix) DC. 1805
Alnus fruticosaRupr.
Alnaster fruticosus(Rupr.) Ledeb.
Duschekia fruticosa(Rupr.) Pouzar
Alnus pumilaNois. ex Corrie
Alnus orbiculataLopylaie ex Spach
Alnus tristisWormsk. ex Regel
Alnus alpinaVill.
Betula viridisChaix in D.Villars
Betula ovataSchrank
Betula alpinaBorkh. ex Theorin
Alnus viridis(Chaix) DC.
Alnus ovata(Schrank) G.Lodd.
Alnaster viridis(Chaix) Spach
Semidopsis viridis(Chaix) Zumagl.
Duschekia ovata(Schrank) Opiz
Duschekia viridis(Chaix) Opiz
Alnus brembanaRota
Alnus corylifoliaA.Kern. ex Dalla Torre
Betula crispaAiton
Alnus crispa(Aiton) Pursh
Alnaster crispus(Aiton) Czerep.
Duschekia crispa(Aiton) Pouzar
Alnus undulataWilld.
Betula alnus-crispaSteud.
Alnus mitchellianaM.A.Curtis ex A.Gray
Alnus repensWormsk. ex Hornem.
Alnus mollisFernald
Alnus viridis var. sinuataRegel
Alnus sinuata(Regel) Rydb.
Duschekia sinuata(Regel) Pouzar
Alnaster sinuatus(Regel) Czerep.
Betula tristisWormsk. ex Link
Alnus sitchensis(Regel) Sarg
Alnus kamschatica(Regel) Kudô ex Masam
Duschekia kamtschatica(Callier) Pouzar
Alnaster kamtschaticus(Callier) Czerep.
Alnus suaveolensReq.
Alnus alnobetula is a common tree widespread across much of Europe, Asia, and North America.[2] Many sources refer to it as Alnus viridis, the green alder, but botanically this is considered an illegitimate name synonymous with Alnus alnobetula subsp. fruticosa.[3]
It is a large shrub or small tree3–12 metres (10–39+1⁄2ft) tall with smooth grey bark even in old age. The leaves are shiny green with light green undersurfaces, ovoid, 3–8 centimetres (1+1⁄4–3+1⁄4in) long and 2–6cm broad. The flowers are catkins, appearing late in spring after the leaves emerge (unlike other alders which flower before leafing out); the male catkins are pendulous, 4–8cm long, the female catkins 1cm long and 0.7cm broad when mature in late autumn, in clusters of 3–10 on a branched stem.[4] The seeds are small, 1–2 millimetres (1⁄32–3⁄32in) long, light brown with a narrow encircling wing.
Alnus viridis subsp. sinuata (A. sinuata, Sitka alder or slide alder) – western North America, far northeastern Siberia
Alnus viridis is classed as an environmental weed in New Zealand.[8]
Ecology
Alnus viridis has a shallow root system, and is marked not only by vigorous production of stump suckers, but also by root suckers.
Alnus viridis is a light-demanding, fast-growing shrub that grows well on poorer soils. In many areas, it is a highly characteristic colonist of avalanche chutes in mountains, where potentially competing larger trees are killed by regular avalanche damage. A. viridis survives the avalanches through its ability to re-grow from the roots and broken stumps. Unlike some other alders, it does require moist soil, and is a colonist of screes and shallow stony slopes. It also commonly grows on subarctic river gravels, particularly in northern Siberia, Alaska and Canada, occupying areas similarly disrupted by ice floes during spring river ice breakup; in this habitat it commonly occurs mixed with shrubby willows.
Uses
It is sometimes used for afforestation on infertile soils which it enriches by means of its nitrogen-fixing nodules, while not growing large enough to compete with the intended timber crop. A. sinuata can add 20kg of nitrogen per acre (50kg/hectare) per year to the soil.[9]Alnus viridis leaves have been used in the traditional Austrian medicine externally or internally as tea for treatment of infections and fever.[10]
↑ Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.
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