This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
蒾 is a rare character composed of the grass radical 艹 and 迷. Its historical development is uncertain, and it may be a variant or specialized form.
The top grass 艹 and bottom 迷 (astray) suggest a plant that is hard to identify or leads one astray, but its actual meaning is uncertain.
For ベイ, imagine a bay leaf plant that is easily confused with other herbs: bay -> ベイ, and the grass 艹 on top hints at a plant.
Wright viburnum (viburnum wrightii)