Unfortunately, in order to do DNA testing as a way to ID a plant, there would need to be a database of the genetic makeup of all of them, and there simply isn't.
Secondly, even if you were to have a database of the species, there is no guarantee that their ID would tell you what your plant is. For example, if your results showed that there were genes from only three species in your plant's background - A, B, and C - there is no way to know if your plant is (A x B) x C, A x (B x C), or (A x C) x B, which are three different hybrids, or even a more complex hybrid combining them several times over.
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