Considering how much oil it can produce, I would imagine the skin of a wragberry to be more like the pulpy parts of the inside of an orange. Lots of little cells containing oil.
Wyn reed I don't really imagine as aromatic but Eyebright I do. I imagine Eyebright as a cross between lemon and lavender.
When lake mushrooms were introduced, they were poisonous and lowered your health if eaten. Presumable there is some poisonous part that you can cut out leaving the rest safe for consumption. However, I believe that if you eat a raw, unprepared lake mushroom it will still lower your health.
As for Butcher's Broom tea, it probably is hard or at least time consuming to strain out all of the fibers so some can get left over in the tea. I kinda imagine it tastes like cooked straw.