Depends on how you define poisonous muckdiva. The only toxicity info I have is on the essential oil which describes it as probably toxic and neurotoxic. It contains artemisia ketone which is a powerful irritant found also in things like wormwood and mugwort. So while it may make a nice potpourri or incense I would err on the side of caution and not use if for cooking.

Lavandin on the other hand although higher in camphor (irritant but good for respiratory problems) than normal lavender would probably be ok as would Lavandula stoechas (usually french - butterfly heads etc.)

However I don't think they would taste as nice.

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Earthbabe
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