The broad-leaved or wych elm (Ulmus montana), indigenous to Scotland.
"The Lady of the Lake" by Sir Walter Scott
Ulmus polygama, L C. Richard in Mem.
"Scientific American Supplement, No. 417" by Various
I noticed in addition Ulmus and Quercus.
"Journals of Travels in Assam, Burma, Bhootan, Afghanistan and TheNeighbouring Countries" by William Griffith
Ulmus (Elm) americana pendula.
"Trees and Shrubs for English Gardens" by Ernest Thomas Cook
Reported on Ulmus, Prosopis, Quercus, etc.
"Texas Honey Plants" by C. E. Sanborn