Final answer:
The poem is a pastoral poem, characterized by its romantic themes and idealized view of nature and love.
Step-by-step explanation:
The excerpt provided is an example of a pastoral poem, which is characterized by its romantic depiction of rural life, focus on nature, and often idealized perspective on the natural world. This genre of poetry frequently includes themes of love and emotion, which are evident in the excerpt's reference to 'ladies fair' and the feelings the speaker has for the 'fairest lady' in green.