Portuguese Broom, White Spanish Broom: Cytisus multiflorus -
Scotch Broom, Scots Broom: Cytisus scoparius (Synonym: Cytisus scoparius var. andreanus) - Bush to 7 feet tall. Leaves are in threes (looking like thin clover leaves). Stems and leaves are a dark green. Flowers bright yellow, often with reddish splotches and irregular in shape, looking like crab claws.
Hairy-fruited Broom, Portuguese Broom, Striated Broom: Cytisus striatus -