A seasoned mountaineer would probably recognize this plant even without flowers. Not doing so will be unfortunate. The leaves could inflict serious skin irritation or pain which could last quite sometime. It is a shame as the inflorescence is quite impressive.
A year ago I got to see the gardens of Pundacion Pacita in Batanes. I saw specimens of this plant proudly displayed with flowers in a prominent area in their garden (background plant of the topiaries - upper right hand corner). I am not sure if the owners know that the plant has this nasty reputation or just that they were so enamoured with the pretty flowers. Or would the Abads know a secret how to keep them in the garden without getting the itch?