Definitions for judas tree
Random House Webster's College Dictionary
a purple-flowered Eurasian tree, Cercis siliquastrum, of the legume family, supposed to be the kind of tree upon which Judas hanged himself.
any of various other trees of the same genus, as the redbud.
Origin of Judas tree:
Judas tree, love tree, Circis siliquastrum(noun)
small tree of the eastern Mediterranean having abundant purplish-red flowers growing on old wood directly from stems and appearing before the leaves: widely cultivated in mild regions; wood valuable for veneers
A small deciduous tree, Cercis siliquastrum, noted for its prolific display of deep-pink flowers in spring