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1423 Views 4 Replies Last post: Jun 19, 2014 6:29 AM by DMcKenzie RSS
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Jun 3, 2014 1:51 PM

Alder uncertainty, central London

Need some help with this alder. Familiar with Common and Italian but this tree is puzzling me. Hybrid, Spaeth's?


Any help appreciated.

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    Jun 18, 2014 8:25 AM (in response to DMcKenzie)
    Re: Alder uncertainty, central London

    I think this might be the Grey Alder (Alnus incana).

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        Jun 18, 2014 8:43 PM (in response to DMcKenzie)
        Re: Alder uncertainty, central London

        The honest answer is I don't know. I'm no expert, I just look in books. My book says of the Grey Alder, "Shoot red-brown above, olive beneath, orange lenticels, covered in grey, short, pubescence; pale shiny grey when older. Bud purple red, curved, 8mm on 2mm stalk. Leaves distant 4-5cm apart, ovate, sometimes nearly round, to 10 x 10cm on petiole 2.5 -3 (8)cm, 9-12 pairs of veins (or veins each side as they may be alternate), small lobules about the middle, sharply toothed, base of leaf entire; dull green above, greyish beneath, pubescent all over or later on veins alone. Deep green until falling in late November." In addition, the bark is described as, "deep grey," with older trees, "dull dark grey."


        I look at your pictures and I see orange lenticels, tufts in leaf axils, sharp toothing, purple bud, 9-12 pairs of veins, lobules, and dull dark grey bark, all of which say Grey Alder. the only thing missing is the all over pubescence but it's hard to tell what, "later on veins alone," means in the context of your pictures. Other than that I don't see anything screaming No at me so I suggested it. But I repeat, I am no expert, particularly not with Alnus. It was a suggestion and I am happy for you to reject it if you have better or more up to date information.



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