North America Non-native Plant

Snoutbean

Botanical name: Rhynchosia totta

USDA symbol: RHTO9

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

Snoutbean (Rhynchosia totta): A Mysterious Member of the Legume Family If you’ve stumbled upon the name snoutbean or Rhynchosia totta in your plant research, you might be wondering what exactly this plant is and whether it deserves a spot in your garden. Well, you’re not alone in your curiosity – ...

Snoutbean (Rhynchosia totta): A Mysterious Member of the Legume Family

If you’ve stumbled upon the name snoutbean or Rhynchosia totta in your plant research, you might be wondering what exactly this plant is and whether it deserves a spot in your garden. Well, you’re not alone in your curiosity – this particular species seems to be one of gardening’s best-kept secrets, and not necessarily by choice.

What We Know About Snoutbean

Snoutbean belongs to the Rhynchosia genus, which is part of the legume family (Fabaceae). Like its relatives, it’s a dicot – meaning it has two seed leaves when it first sprouts. Beyond these basic botanical facts, however, specific information about Rhynchosia totta is surprisingly scarce in common horticultural literature.

The Mystery of Limited Information

Here’s where things get interesting (or frustrating, depending on your perspective). Despite diligent searching through plant databases, gardening resources, and botanical literature, detailed information about Rhynchosia totta’s native range, growing conditions, and garden performance remains elusive. This could mean several things:

  • It may be a rarely cultivated species
  • It could have limited geographic distribution
  • It might be known by other names in different regions
  • Documentation may be limited to specialized botanical studies

Should You Plant Snoutbean?

Without clear information about this plant’s native status, invasive potential, or growing requirements, it’s difficult to make a definitive recommendation. If you’re considering planting Rhynchosia totta, here are some important steps to take first:

  • Verify the plant’s identity with local botanical experts or extension services
  • Research its status in your specific region
  • Confirm it’s not listed as invasive or noxious in your area
  • Ensure any plant material is from reputable, legal sources

Alternative Approaches for Your Garden

Given the uncertainty surrounding Rhynchosia totta, you might want to consider well-documented native alternatives that offer similar benefits. Many regions have native legumes that provide:

  • Nitrogen fixation for soil improvement
  • Attractive flowers for pollinators
  • Food sources for wildlife
  • Interesting foliage textures

Contact your local native plant society or extension office for recommendations of native legumes suited to your area.

If You Do Decide to Grow It

Should you manage to source Rhynchosia totta and confirm it’s appropriate for your region, general care guidelines for Rhynchosia species suggest they typically prefer:

  • Well-draining soils
  • Full sun to partial shade
  • Moderate water requirements once established
  • Minimal fertilization (they fix their own nitrogen)

However, these are general guidelines and may not apply specifically to R. totta.

The Bottom Line

Snoutbean (Rhynchosia totta) remains something of an enigma in the gardening world. While the mystery might appeal to plant collectors and botanical enthusiasts, most gardeners would be better served by choosing well-documented native species with known benefits and growing requirements.

If you’re drawn to the challenge of growing unusual plants, just make sure you do your homework first. When in doubt, there’s always beauty and satisfaction in growing the native plants that are well-suited to your local ecosystem – and you’ll have plenty of reliable information to guide your success.

Snoutbean

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 totta (Thunb.) DC. - snoutbean

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