- blackthorn, sloe, Prunus spinosa - a thorny Eurasian bush with plumlike fruits
--1 is a kind of shrub, bush
--1 is a member of Prunus, genus Prunus - blackthorn, pear haw, pear hawthorn, Crataegus calpodendron, Crataegus tomentosa - erect and almost thornless American hawthorn with somewhat pear-shaped berries
--2 is a kind of hawthorn, haw
--2 is a member of Crataegus, genus Crataegus