Funky, the last line is absent from all the older versions. The "older" versions are all 20th c., and unless some documentation can be put forth, likely yours is as well.

Here is one actually about a rose (flower). The original?. Perhaps out of a flower book or catalogue:

Rose, rose, rose, rose,
Shall I ever see thee red?
Aye, marry, that thou wilt,
If thou but stay.

With music, p. 159, Janet E. Tobitt, 1946, "The Ditty Bag," NY.
(Posted before? Several threads; I didn't check them all.