* Simile: A simile uses words like "like" or "as" to compare two things. The phrase "foam brightens like the dogwood now" directly compares the foam to dogwood blossoms using "like."
Let's look at the other options:
* Metaphor: A metaphor directly equates two things without using "like" or "as."
* Alliteration: Alliteration is the repetition of consonant sounds at the beginning of words.
* Consonance: Consonance is the repetition of consonant sounds within words.
While there might be some consonance in the phrase, the primary literary device is a simile.