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It is POSSIBLE that the weed is new, but PROBABLE that it was just missed.

What evidence do you have to support the idea that it was just missed? And if you don't have any, isn't the idea that it was more likely missed simply your unsupported assumption? In which case, why should someone believe it over the (supported) theory that it is new?

>>What evidence do you have to support the idea that it was just missed?<<

What evidence?

It is assumed that it is an existing species WITHOUT EVIDENCE, until sufficient evidence is unearthed to support the IMPROBABLE condision that it is new. The burden of proof lies on the one making the statement that the IMPROBABLE is true. And stating that ANY plant is a new species is an exercise in the improbable until proven otherwise. That is where the burden of proof lies.

Are you being intentionally obtuse?

>>In which case, why should someone believe it over the (supported) theory that it is new? <<

The word in parenthesis is a subjective opinion with which I happen to disagree.