Scotch broom
(Cytisus scoparius)

This is an invasive species.

Scotch broom has been introduced into several continents outside its native range and it is classified as a noxious invasive species in California and in the Pacific Northwest, in Australia,in New Zealand and in India The prolific growth of this species after timber harvest inhibits reforestation by competing with seedling trees. It is estimated that it is responsible for US$47 million in lost timber production each year in Oregon.[