[MAIPC] About English ivy, Common ivy, other Hedera species, genomics...

[frazmo]

Hey y'all, so I've been thinking about my nemesis, what I've always called
English ivy and considered to be Hedera helix in scientific binomial
nomenclature. I have noticed that iNaturalist is now calling it Common
ivy... I'm not sure how widespread that usage is. English ivy was what
started me down the road to invasive whacking madness beginning several
decades ago. It was kind of like a gateway drug that led me along to
broader invasives/ecological restoration work in Arlington County, VA.

Anyway... Years ago I was told by an American Ivy Society person (yes,
there is such an organization and they still exist!) that the invasive ivy
in my Glencarlyn Park was not their beloved Hedera helix but rather H.
hibernica. I thought at the time that this was a classic case of "Blame it
on the Irish", but I digress. It does appear that H. hibernica is a valid
species. However, as I recall, a key character to differentiate involves
trichome structure, and that is getting awfully technical.

So, getting to the point, I am curious about whether any of you folks, or
anyone you know, has looked at Hedera species and drawn any conclusions. I
am prepared to be open-minded that the major invasivity issue lies with H.
hibernica -- if there is strong supporting evidence. I am especially
interested in whether anyone has done genomic work on Hedera or is
interested in looking at that. I would find genomic evidence convincing. I
also hope that evidence will counter any attempts to muddy the waters.

Finally, I notice that the recent "Plant Invaders of Mid-Atlantic Natural
Areas" field guide still uses the English ivy, H. helix nomenclature, but
also states that "Two other species of Hedera are recognized as invasive in
the U.S.: Atlantic ivy (H. hibernica), which is difficult to distinguish
from English ivy, and Canary Island ivy (H. canariensis)."

Thanks in advance for any information. And I will clarify that yes, I agree
that ultimately it doesn't matter which Hedera a vine is; if it is invasive
it needs to go.

Best and cheers,

Steve Young
Arlington volunteer
Frazmo at gmail.com
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