Flowers.  They offer a sure sign that spring has arrived.  And during my walk yesterday morning, I came across several exquisite varieties intent on sharing delightful bursts of color.

Northern catalpa (Catalpa speciosa)

Showy evening primrose (Oenothera speciosa)

Roughleaf dogwood (Cornus drummondii)

Wild onion (Allium canadense)

Common dandelion (Taraxacum officinale)