QUOTE: Two meanings for non-flowering. One is plants that never
flower,
ferns, mosses, and the like, the other meaning would be plants that
don't have flowers at the time you observed them. Do you know which
meaning is intended?

My teacher says those who do not have flowers at the observed time.
However, in this category, she has allowed us to include a few lichens/
mosses/mushrooms. Ferns are initially what was meant by non-flowering.

So...my answer is, both? Yes, both.