Dogwood was originally brought to Japan in 1912 as part of the flower exchange between Washington DC and Tokyo. Somei-Yoshino, (Cerasus yedoensis, hybrid species of cherry blossom originated from Japan) was brought to the U.S. instead.
Historical background aside, I'm always interested in the way dogwood blooms: the petal-looking involucre that wraps around the inflorescence opens itself by breaking into four parts from the tip. Doesn't it hurt?
So, I love this somewhat sci-fi way the dogwood flowers look before its involucre opens. They are in full bloom now.