Abeliophyllym distichum (White Forsythia)
This is not really a forsythia at all. The botanical name is Abeliophyllum distichum. It blooms earlier than the yellow forsythia and is very sweetly scented. Like forsythia, it can be forced to bloom inside after the buds swell in early March.
The shrub doesn't have much to recommend it after the blossoms fade, but it does look pretty in bloom against a background of evergreens!
It will grow to more than 4 feet tall, and get just as wide.