North America Native Plant

Tropical Passionflower

Botanical name: Passiflora anadenia

USDA symbol: PAAN5

Life cycle: perennial

Habit: vine

Native status: Native to Puerto Rico  

Tropical Passionflower: A Mysterious Puerto Rican Native Meet the tropical passionflower (Passiflora anadenia), a lesser-known member of the beloved passionflower family that calls Puerto Rico home. While most gardeners are familiar with common passion vines, this particular species remains something of an enigma in the horticultural world—and that’s exactly what ...

Tropical Passionflower: A Mysterious Puerto Rican Native

Meet the tropical passionflower (Passiflora anadenia), a lesser-known member of the beloved passionflower family that calls Puerto Rico home. While most gardeners are familiar with common passion vines, this particular species remains something of an enigma in the horticultural world—and that’s exactly what makes it so intriguing.

What Makes This Passionflower Special?

Passiflora anadenia stands out as a native Puerto Rican species, making it a true treasure for those interested in regional flora. Unlike its more robust climbing cousins, this species grows as a perennial forb or herb, meaning it lacks the significant woody tissue you’d find in typical passion vines. Think of it as the more delicate, herbaceous relative in the passionflower family tree.

Where You’ll Find It Growing Wild

This tropical passionflower is endemic to Puerto Rico, where it has evolved to thrive in the island’s unique climate and conditions. Its limited geographical distribution makes it a special plant for those lucky enough to encounter it in its native habitat.

The Mystery Factor: Why Information is Scarce

Here’s where things get interesting (and a bit challenging for gardeners). Passiflora anadenia appears to be one of those plants that hasn’t made it into mainstream horticulture yet. This could mean several things:

  • It might be naturally rare in the wild
  • It could have specific growing requirements that make cultivation tricky
  • It may simply not have caught the attention of commercial growers yet

Should You Try Growing It?

The honest answer? Proceed with extreme caution and lots of research. Since we don’t know this plant’s conservation status, invasive potential, or specific growing needs, it’s not something to casually add to your shopping list. If you’re in Puerto Rico or a similar tropical climate and happen to come across seeds or plants, make sure they’re from a reputable, conservation-minded source.

General Passionflower Growing Tips (Use with Caution)

While we can’t provide specific care instructions for P. anadenia, most passion flowers share some common preferences:

  • Well-draining soil that doesn’t stay soggy
  • Plenty of sunlight (usually full sun to partial shade)
  • Regular watering during the growing season
  • Protection from harsh winds

However, remember that this species grows as an herb rather than a climbing vine, so its needs might be quite different from typical garden passion flowers.

Better Native Alternatives

If you’re drawn to the idea of growing native passionflowers but live outside Puerto Rico, consider researching passion vine species native to your region. Many areas have their own wonderful Passiflora species that are better understood and more readily available through responsible nurseries.

The Bottom Line

Passiflora anadenia represents the fascinating world of lesser-known native plants that still hold secrets waiting to be discovered. While it’s not ready for your average home garden, it serves as a reminder that there’s still so much we don’t know about our plant world—and that’s pretty exciting for any plant lover.

If you’re serious about growing this species, connect with botanical gardens, native plant societies, or conservation organizations in Puerto Rico who might have more information about this mysterious tropical passionflower.

Tropical Passionflower

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Violales

Family

Passifloraceae Juss. ex Roussel - Passion-flower family

Genus

Passiflora L. - passionflower

Species

Passiflora anadenia Urb. - tropical passionflower

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA