North America Non-native Plant

Geocarpa Groundnut

Botanical name: Macrotyloma geocarpum

USDA symbol: MAGE2

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

Synonyms: Kerstingiella geocarpa Harms (KEGE)   

Geocarpa Groundnut: A Mysterious Plant with Limited Garden Potential If you’ve stumbled upon the name geocarpa groundnut in your plant research, you’re likely wondering what exactly this mysterious species is and whether it belongs in your garden. The truth is, Macrotyloma geocarpum is one of those botanical enigmas that exists ...

Geocarpa Groundnut: A Mysterious Plant with Limited Garden Potential

If you’ve stumbled upon the name geocarpa groundnut in your plant research, you’re likely wondering what exactly this mysterious species is and whether it belongs in your garden. The truth is, Macrotyloma geocarpum is one of those botanical enigmas that exists more in scientific literature than in practical gardening applications.

What is Geocarpa Groundnut?

Geocarpa groundnut, scientifically known as Macrotyloma geocarpum, is a member of the legume family. You might also encounter it listed under its synonym Kerstingiella geocarpa Harms in older botanical references. Despite its intriguing name, this plant remains largely shrouded in mystery when it comes to practical gardening information.

The Challenge of Growing the Unknown

Here’s where things get tricky for us gardeners: there’s remarkably little documented information about this particular species. We don’t have reliable data about its:

  • Native range or geographic distribution
  • Growth habits and mature size
  • Preferred growing conditions
  • USDA hardiness zones
  • Care requirements
  • Aesthetic qualities
  • Wildlife or pollinator benefits

Should You Plant Geocarpa Groundnut?

Given the lack of available information, growing Macrotyloma geocarpum presents significant challenges. Without knowing its native status, invasive potential, or basic care requirements, it’s difficult to recommend this plant for home gardens. Additionally, sourcing seeds or plants would likely prove extremely difficult, if not impossible.

Better Alternatives for Your Garden

If you’re interested in groundnut species for your garden, consider these better-documented alternatives:

  • American groundnut (Apios americana) – a native North American vine with edible tubers
  • Peanut groundnut (Arachis hypogaea) – the familiar peanut plant
  • Other Macrotyloma species with better horticultural documentation

The Bottom Line

While Macrotyloma geocarpum certainly sounds intriguing, the lack of available growing information makes it an impractical choice for most gardeners. Sometimes the most responsible approach is to admire a plant’s botanical curiosity from afar while choosing better-understood species for our actual gardens. Your time and garden space are precious resources – invest them in plants with proven track records and clear growing guidelines.

If you’re a botanical researcher or have access to specialized plant collections, geocarpa groundnut might be worth investigating further. For the rest of us, there are plenty of wonderful, well-documented plants waiting to grace our gardens.

Geocarpa Groundnut

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

Macrotyloma (Wight & Arn.) Verdc. - macrotyloma

Species

Macrotyloma geocarpum (Harms) Marechal & Baudet - geocarpa groundnut

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