It's time for flowers on Acer pseudoplatanus, and these flowers seem more or less right for that, but I haven't seen that species with leaves almost 3-lobed like these. I also never noticed on sycamore maples that the racemes have the female flowers at the top and the male flowers below, as these seem to have, and I never noticed such rounded samaras. And the petioles seem unusually long, more the length of Norway maples, but the flowers and blooming time are wrong for that, and the leaves seem really wrong for that. What I never noticed before doesn't mean much, but I'm wondering if it's some maple I don't know.
Hi Wendy, I think it all falls within the leaf shape for sycamore, but the samara's suggest perhaps Heldriech's maple, A. heldreichii. Very difficult to distinguish from pseudoplatanus variations. As the leaves age you might see a more pronounced lobe shape. Good to see you back out there! :) -E
