Poisonous plants

I thought it might be a good idea to have a list:

Ragwort
Hemlock
Purple Milk Vetch
Yellow Star Thistle
St. Johns Wort
Privet
Buckthorn
Laburnum
Rhododendron
Laurel
Yew
Acorns from oak trees

[bellasabaggage]

Is Purple Toadflax poisonous to horses? Seem to remember reading somewhere that someone had some in their field after it had been flooded and they were advised to get rid

[svmel]

And Foxglove.

And apparently sycamores have something to do with atypical myopathy (or something like...)

[MrsMozart]

Can't find anything on Google about it and horses.

Did find a couple of things that say they throw out a lot of seeds. I'd therefore be tempted to dig it up.