The worst varieties for allergy-prone people are orchid, fuca, yuccus, ivy, palm and fern.
From the orlandosentinel.com
These are known to be the bases of trees up to about 10 meters in height, that looked something like a palm tree or a tree fern.
From the sciencedaily.com
Three palm trees, fern, hibiscus, cannas, bird of paradise, succulents and a wisteria climbing an arbor patio entry at the side of the house added color and brightened a previously dull landscape.