lead tree

1 :  lead crystallized in arborescent forms from a solution of some lead salt (as by suspending a strip of zinc in lead acetate)

2 :  a plant of the genus Leucaena; especially :  a low scrubby tree (Leucaena glauca) probably native to tropical America but now pantropical in distribution and often cultivated as a ground cover, for windrows or hedging, and as forage for cattle and sheep though reputedly toxic to horses and swine