http://www.collinsdictionary.com/dictionary/e...
grey alder (ɡreɪ ˈɔːldə)
Definitions
noun
a variety of alder (alnus incana) with grey bark, common in temperate areas of the northern hemisphere

http://rbg-web2.rbge.org.uk/cgi-bin/nph-readb...
Alnus incana
Authority (Brummitt & Powell): (L.) Moench
Place of original publication: Methodus 424 (1794)
[…]
Native/Alien: A
English name: Grey Alder

http://wordnetweb.princeton.edu/perl/webwn?s=...
S: (n) grey alder, gray alder, Alnus incana (native to Europe but introduced in America)

http://plants.usda.gov/core/profile?symbol=ALIN2
Alnus incana (L.) Moench
gray alder

http://www.forestryimages.org/browse/subimage...
gray alder
Alnus incana (L.) Moench

http://www.rook.org/earl/bwca/nature/shrubs/a...
Alnus incana
Speckled Alder

http://www.newfs.org/grow/featured-native-spe...
Alnus incana
Common Name: Speckled Alder

https://gobotany.newenglandwild.org/species/a...
Alnus incana (L.) Moench
speckled alder

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http://www.stmelf.bayern.de/mam/cms02/asp/dat...
ALNUS INCANA L.
Grauerle

http://www.eggert-baumschulen.de/products/de/...
Alnus incana - Grauerle oder Weißerle

http://www.baumschule-horstmann.de/shop/exec/...
Grauerle / Weißerle
Alnus incana

http://www.luontoportti.com/suomi/de/puut/wei...
Weißerle
Alnus incana

http://flora.nhm-wien.ac.at/Seiten-Arten/Alnu...
Betulaceae / Alnus incana
Botanik im Bild / Flora von Österreich
[…]
Grau-Erle / Weiß-Erle

http://www.baumschule-newgarden.de/product_in...
Alnus incana / Grau-Erle / Weiß-Erle

http://www.stihl.de/baumlexikon-detailseite.a...
Grau-Erle, Weiß-Erle (Alnus incana)

http://www.duden.de/rechtschreibung/Grauerle
Grauerle, die
[…]
Bedeutung
Erle mit heller, grauer Rinde; Weißerle

http://www.wissen.de/rechtschreibung/grauerle
Grau|er|le 〈f. 11〉 (vor allem in Auwäldern verbreitete) Erle mit hellgrauer Rinde

Native & growing wild in Germany, Austria, Switzerland, Europe eastward from France, Turkey, the Caucasus, across Siberia to Manchuria, Korea, Japan, Kamchatka, Alaska, Canada, & US (the North American plants are often distinguished as Alnus rugosa). Naturalized in UK, Ireland, & elsewhere.
Distribution / Verbreitung: in the Northern Hemisphere
in Europe
in Deutschland
Pictures / Bilder

Other English names (not proposed):
creek alder
European gray alder
hoary alder
mountain alder
swmap alder
tag alder
thin-leaved alder
white alder

Andere deutsche Namen (nicht vorgeschlagen):
die Auerle
Preußische Erle
die Roterle

Taxonomic citation:
Alnus incana (Linnaeus) Moench, Methodus Plantas Horti Botanici et Agri Marburgensis
424. 1794.
Basionym:
Betula alnus var. incana Linnaeus, Species Plantarum 2: 983. 1753.

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