Beautiful as they are, the showiest part of the flowers of our most popular landscape dogwoods are not true petals. Botanically speaking they are bracts. They protect the leaf and flower buds overwinter and possibly more...!
Read my essay about misunderstanding the dogwood at Metropolitan Field Guide.
Even more dogwood:
Tracking population loss in Cornus florida since discovery of Discula destructiva, causal agent of dogwood anthracnose, in eastern North America
Dogwood blossoms, PhillipsFarm, at Union Square Greenmarket
Dogwood photograph art, Seattle, Kathleen Atkins on Etsy
P.S. View an "understated and elegant" dogwood photographed by Tokyo Green Space.