“Let me guess, someone stole your sweetroll…” (Skyrim, friends, we’re referencing Skyrim like big TES nerds)
Flowerkin is actually neither an insult nor another species, though in the recent excerpt Sam is using it to tease Bowman (Actual tease –
“Bowman is still a dainty flowerkin like always. He didn’t even get a bruise on his wings.”). It is simply a word wood sprites use to describe particularly dainty wood sprites (which is saying something because they’re all kind of willowy and thin thanks to their metabolisms). In my sprite lore, flowerkin wood sprites are responsible for the popular artistic depiction of fairies wearing flower petals and such.
For example, here is a wood sprite character that I have developed who would be considered very flowerkin:

This little lady has yet to show up in any of my stories, but she will (someday… when I get around to it).
Art by the-searching-one.