North America Non-native Plant

Rhynchosia Malacophylla

Botanical name: Rhynchosia malacophylla

USDA symbol: RHMA13

Native status: Not native but doesn't reproduce and persist in the wild

Synonyms: Rhynchosia sennaarensis Hochst. ex Schweinf. (RHSE8)   

Rhynchosia malacophylla: A Mystery Plant Worth Investigating Sometimes in the plant world, you stumble across species that seem to have slipped under the radar of most gardening guides and horticultural resources. Rhynchosia malacophylla is one such plant – a member of the legume family that remains somewhat enigmatic in terms ...

Rhynchosia malacophylla: A Mystery Plant Worth Investigating

Sometimes in the plant world, you stumble across species that seem to have slipped under the radar of most gardening guides and horticultural resources. Rhynchosia malacophylla is one such plant – a member of the legume family that remains somewhat enigmatic in terms of its garden potential and growing requirements.

What We Know (And Don’t Know) About This Plant

Rhynchosia malacophylla belongs to the Rhynchosia genus, which includes various climbing and trailing legumes. This particular species has been documented in botanical literature with the synonym Rhynchosia sennaarensis, but beyond these scientific classifications, detailed information about its characteristics remains surprisingly scarce.

Unfortunately, common names for this species aren’t well-documented, which often indicates limited cultivation or regional use. This lack of widespread common names suggests it may not be commonly grown in typical garden settings.

Geographic Distribution and Native Status

The geographic distribution and native range of Rhynchosia malacophylla aren’t clearly documented in readily available horticultural sources. Based on its synonym and the broader Rhynchosia genus distribution, it may originate from tropical or subtropical regions, but without confirmed native status information, it’s difficult to provide specific guidance about where this plant naturally occurs.

Should You Grow Rhynchosia malacophylla?

Here’s where things get tricky. With limited information about this plant’s:

  • Growth habits and mature size
  • Invasive potential
  • Native status in various regions
  • Specific growing requirements
  • Wildlife and pollinator benefits

It’s challenging to provide a definitive recommendation about whether to include it in your garden. The responsible approach would be to exercise caution until more information becomes available.

What This Means for Gardeners

If you’re considering this plant, here are some thoughtful steps to take:

  • Research local native alternatives within the legume family that provide similar benefits
  • Consult with local extension offices or native plant societies about this species
  • If you do encounter this plant, observe it carefully and document its behavior in your specific growing conditions
  • Consider well-documented native Rhynchosia species instead, if available in your region

The Bottom Line

While Rhynchosia malacophylla exists in botanical literature, the lack of detailed horticultural information makes it difficult to recommend for typical garden use. Sometimes the most responsible gardening choice is to stick with well-documented plants whose behavior, benefits, and potential impacts are clearly understood.

If you’re drawn to leguminous plants for their nitrogen-fixing abilities and often attractive flowers, consider exploring native alternatives in your region that have established track records in cultivation. Your local native plant society or extension office can point you toward species that will thrive in your specific conditions while supporting local ecosystems.

Remember, gardening is about making informed choices that benefit both your landscape and the broader environment – and sometimes that means waiting for better information before taking the plunge with mysterious species like this one.

Rhynchosia Malacophylla

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Fabales

Family

Fabaceae Lindl. - Pea family

Genus

Rhynchosia Lour. - snoutbean

Species

Rhynchosia malacophylla (Spreng.) Bojer

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