North America Native Plant

Threelobe Pygmymelon

Botanical name: Psiguria trilobata

USDA symbol: PSTR3

Life cycle: perennial

Habit: vine

Native status: Native to Puerto Rico  

Threelobe Pygmymelon: A Mysterious Native Puerto Rican Plant If you’ve stumbled across the name threelobe pygmymelon in your plant research, you’ve discovered one of those wonderfully quirky botanical mysteries that keeps plant enthusiasts on their toes. This perennial herb, scientifically known as Psiguria trilobata, is native to Puerto Rico but ...

Threelobe Pygmymelon: A Mysterious Native Puerto Rican Plant

If you’ve stumbled across the name threelobe pygmymelon in your plant research, you’ve discovered one of those wonderfully quirky botanical mysteries that keeps plant enthusiasts on their toes. This perennial herb, scientifically known as Psiguria trilobata, is native to Puerto Rico but remains one of those elusive plants that doesn’t get much spotlight in the gardening world.

What is Threelobe Pygmymelon?

Threelobe pygmymelon belongs to the fascinating world of forbs – those herbaceous plants that lack the woody stems of shrubs and trees but pack plenty of character into their softer growth. As a perennial, this plant returns year after year, though exactly what it looks like when it does return is where things get interesting (and a bit mysterious).

The name gives us a few clues: threelobe suggests leaves that are divided into three sections, while pygmymelon hints at its relationship to the cucumber and melon family. But beyond these naming breadcrumbs, detailed information about this particular species is surprisingly scarce.

Where Does It Call Home?

This native gem calls Puerto Rico home, making it part of the rich botanical heritage of this Caribbean island. Puerto Rico’s diverse ecosystems – from coastal areas to mountainous regions – host an incredible variety of native plants, and threelobe pygmymelon is one of them.

The Challenge for Gardeners

Here’s where things get a bit tricky for the eager gardener. While we know this plant exists and is native to Puerto Rico, detailed growing information is remarkably limited. This isn’t uncommon with lesser-known native species – sometimes plants exist in botanical records without having made the jump to mainstream horticulture.

For gardeners in Puerto Rico or similar tropical climates, this plant represents an intriguing piece of local botanical heritage. However, the lack of readily available growing information means you’d be venturing into relatively uncharted gardening territory.

What We Don’t Know (But Wish We Did)

The mystery surrounding threelobe pygmymelon extends to many practical gardening questions:

  • Specific growing conditions and care requirements
  • Mature size and growth habits
  • Flower characteristics and blooming period
  • Wildlife and pollinator benefits
  • Propagation methods
  • Availability from nurseries or seed sources

For the Adventurous Gardener

If you’re a gardener in Puerto Rico with a passion for native plants and botanical detective work, threelobe pygmymelon might be worth investigating further. Consider reaching out to local botanical gardens, native plant societies, or university extension programs that might have more detailed information about this species.

Sometimes the most rewarding gardening experiences come from growing plants that aren’t found in every garden center – though in this case, you’d definitely be pioneering uncharted territory!

The Bottom Line

Threelobe pygmymelon represents one of those fascinating botanical footnotes – a native plant with an intriguing name and Puerto Rican heritage but limited practical growing information. For most gardeners, this plant remains more of a botanical curiosity than a practical gardening choice, at least until more growing information becomes available.

If you’re passionate about Puerto Rican native plants, consider focusing on better-documented native species while keeping an eye out for any future research or cultivation information about this mysterious threelobe pygmymelon.

Threelobe Pygmymelon

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

Cucurbitaceae Juss. - Cucumber family

Genus

Psiguria Neck. ex Arn. - pygmymelon

Species

Psiguria trilobata (L.) Howard - threelobe pygmymelon

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