The stairway-to-heaven, I was told, is actually a Philippine native plant called Freycinetia multiflora. It is a member of the pandan family. Freycinetias are collectively called climbing pandans because of their growth behavior, anchoring themselves on a tree or branch to reach higher ground and sunlight. Pandans are also known as screw pines as most have spiral leaf arrangement. This is also probably why they called F. multiflora 'stairway-to-heaven' because they resemble small spiral staircases.
F. multiflora is becoming a fixture in most home gardens. It is already popular as a collection ornamental plant. It still has to be promoted more be mainstreamed as a landscape material.