Since it is National Arbor Month this month will be filled with 4 of my favorite trees.
Just starting to bloom now around Portland is the Fringe Tree, Chionanthus virginica.
This showstopper is a deciduous tree (USDA Zone 4-9) which has a rounded, shrubby habit. It will grow slowly to 20′ or so which makes it a good choice for smaller gardens. Each spring it produces these fringe-like, sweetly fragrant flowers followed by small bluish fruit that is attractive to birds.