An asphodel:

Refers to a person as a flower and how one person lusts for another.

Song:

Song covers the ultimate love that everyone has. We are all born with it and in certain ways love guides certain people. However it is something that can overwhelm people, so it states how rest is always necessary.

Wild orphan:

The focus is on a boy with his mother who lives in an imaginary world. His father is not around but it is not certain whether he is dead or has just left the family behind. The boy's ultimate emotion is loneliness.

In back of the real:

It talks of a yellow flower, ugly and pointy, and is referred to as the world, mainly as industry. The last part is confusing though. It states how it is "with the form of the great yellow Rose in your brain!" What is the 'Rose?'