What herb toxin found in Canadian Montains that kills in one hour after
Injesting and causes the following symtoms asphyxia, vommiting,
convulsion, shakyness, hyperpyrexia, systematic hypotension, and acidosis.

Toxins from poison-hemlock (Conium maculatum) or from a water-hemlock
(Cicuta sp.) perhaps?

http://www.cbif.gc.ca/pls/pp/ppack.info?p_psn=41&p_type=all&p_sci=sci&p_x=px
http://www.cbif.gc.ca/pls/pp/ppack.info?p_psn=43&p_type=all&p_sci=sci&p_x=px

:-) As2O3

In a similar vein, there is a plant indigenous to southwest Western
Australia called Box Poison. It has a succulent leaf very attractive
to sheep. They can tolerate a shoot of the bush coming out of the
ground, but at 12 inches high is so toxic, that one small bush can
kill 2oo sheep. It was probably called the Box Bush originally, but
experience by farmers caused its renamimg. An extract of its foliage
is used to make the poison "1080" used to lace meat baits to combat
introduced cats and foxes. And an amazing fact. The plant is harmless
to indigenous herbivorous wildlife such as kangaroos and other species
of wallabies.