Acacia longifolia (aka Acacia latifolia) - Sydney Golden Wattle
Sydney Golden Wattle is a fast-growing large shrub to 12-20 feet tall with an equal spread. Bright green leaves are 3-6 inches long. Yellow flowers bloom in late winter to spring. It's tolerant of drought and heat as well as frost and also tolerates coastal conditions. Great for use as a screen or wind break. Can also be trained into a small tree.