Oh Christmas Tree

Can anyone tell me what the name of this tree is? This is known as the Christmas Tree to the locals. The reason being that it blooms (yellow like this) around Christmas time. It's certainly quite different than the Christmas tree we are accustomed to. (My first thought was, "this tree is no good for hanging ornaments")

The story goes that when an Australian Missionary first came to the area in the early 1900s , he brought over these seeds as a little piece of home in a foreign land. The church among the minority people in this area grew over the years (as did the trees he planted). Now the tree serves as a memorial to God's faithfulness to the people in the area and whenever they build a new church building, they plant these trees around it.