Question: Yes / no, is the following a verifiable fact?
"The stem characteristics of Populus decide their four sections of classification as black poplars, balsam poplars, etc.." Let's think first. Step-by-step reasoning:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Populus has traditionally been divided into six sections on the basis of leaf and flower characters.
So, the final answer is no.