palmae: chiefly tropical trees and shrubs and vines usually having a tall columnar trunk bearing a crown of very large leaves; coextensive with the order Palmales
monocot family: family of flowering plants having a single cotyledon (embryonic leaf) in the seed
whitethorn: thorny Eurasian shrub of small tree having dense clusters of white to scarlet flowers followed by deep red berries; established as an escape in eastern North America