cockspur thorn(n = noun.plant) cockspur hawthorn, crataegus crus-galli - eastern United States hawthorn with long straight thorns;
is a kind of haw, hawthorn
is a member of crataegus, genus crataegus

christ thorn, cockspur, cockspur hawthorn, common thorn apple, evergreen thorn, fire thorn, glastonbury thorn, hedge thorn, jerusalem thorn, mysore thorn, parsley-leaved thorn, thorn, thorn apple