I am a parasitic plant, often found on trees, with striking, fragrant flowers. I have a unique relationship with my host, taking nutrients and water, but also sometimes contributing to its biodiversity. What am I?

1. I grow on the branches or trunks of other plants.
2. My flowers are showy and often vibrantly colored, attracting pollinators.
3. I lack roots that reach into the ground.
4. I may have various interactions with birds and other wildlife.