Werauhia sintenisii, a bromeliad native of Puerto Rico, growing near Mt. Britton.

Marcgravia sintenisii Urb. in El Yunque forest, a native vine,

A vine, very common in certain parts of El Yunque forest.  The first photo shows the inflorescence in its normal position, the second photo is from the bottom up.  Given the orientation of the inflorescences, few people notice this vine's flowers.