I have a big collection of ivy (Hedera) but fail to identify this specimen as species. It has matt leaves all of the similar shapes and with unusual stellate trichomes of 7-8 (10) rays - nearly scale-like but of fully fr
ee rays. The trichomes of this specimen do differ from those of other Hedera species. This specimen came from a Saint Petersburg's Botanical garden but of unknown origin. I took the photo of the specimen in my garden. The help will be acknowledged.
Dear Pierre,
Thank you for your answer and your interest.
I upload tho pictures of trichomes, one of Hedera sp. (in question), another of H. hibernica. You can see the difference, and in addition, I can say that trichomes of H. sp. are persistent, and ones of H. hibernica not.
PS Your manual is superb! Thanks!
have you tried using the key published by Ackerfield et al.?
see attached
Yes, I tried to use all key available incl. this one. To say precisely, I grow all Hedera spp. known in my co
llection and can compare all characters of them. I just hope anybody has met this strange ivy at least to know where it is from.
Anyway many thanks to you for your efforts to help me. All I can now is to count chromosome number.
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