Line 316:  The Toothwort White haunted our woods in May

Frankly, I am not certain what this means.  My dictionary defines “toothwart” as “a kind of cress” and the noun “white” as “any pure white breed of farm animal or a certain genus of lepidoptera.”  Little help is provided by the variant written in the margin:

In woods Virginia Whites occurred in May

Folklore characters, perhaps?  Fairies?  Or cabbage butterflies?