Any of various shrubs and small trees of the genus Crataegus having small, apple-like fruits and thorny branches
Bursaria spinosa, a small Australian shrub.
Ceanothus leucodermis, chaparral whitethorn, a shrub in the family Rhamnaceae.
Crataegus monogyna, a hawthorn species native to Europe, northwest Africa and western Asia.
Vachellia constricta, formerly Acacia constricta, whitethorn acacia, a shrub in the family Fabaceae.