Laburnum
Pronunciation : La*bur"num
Part of Speech : n.
Etymology : [L.] (Bot.)
Definition : Defn: A small leguminous tree (Cytisus Laburnum), native of the Alps. The plant is reputed to be poisonous, esp. the bark and seeds. It has handsome racemes of yellow blossoms.
Note: Scotch laburnum (Cytisus alpinus) is similar, but has smooth leaves; purple laburnum is C. purpureus.
Source : Webster's Unabridged Dictionary, 1913