According to Kathy :
Glyphasate and triclopyr. I am going to

Are you sure that's not Glysophate? That's Roundup.

Get the concentrated version, maybe mix it 2 or 3 times
stronger than the instructions, and add a teaspoon of
dishsoap per quart.

Put on some dishwashing rubber gloves.

Get some cheap cotton gloves, stuff with a little cotton
batten, and then put the gloves over the rubber gloves.

Dip your hand in the concentrate. "swipe" the plants
with your hands, so the whole plant (I'd cut the stems
a foot or two up, ignore the stuff above the cuts) gets
thoroughly dampened with the stuff.

[This is how a professional botanist eradicates the stuff.]

Glysophate is _quite_ innocuous to animals/humans, so this
is not dangerous. Just don't go overboard getting it on
you. Wash up, and dispose of the cotton. The rubber gloves
will be okay with a rinse.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.