my favourite highly toxic Colchicum autumnale, commonly known as autumn crocus, meadow saffron or naked ladies, is a toxic autumn-blooming flowering plant that resembles the true crocuses, but is a member of the Colchicaceae plant family, unlike the true crocuses which belong to the Iridaceae family.Wikipedia
From CL1's link The symptoms of colchicine poisoning resemble those of arsenic, and no antidote is known. TD Not quite sure how it fits into the section of the OP's link which seems to deal with waterproofing ??
My immediate thought was of the Desert Roses that abounded around tented camps post war not sure about WW2.