North America Non-native Plant

Lathyrus Hygrophilus

Botanical name: Lathyrus hygrophilus

USDA symbol: LAHY3

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

Synonyms: Lathyrus kilimandsharicus Taub. (LAKI3)   

Lathyrus hygrophilus: The Mystery Pea of the Plant World If you’ve stumbled upon the name Lathyrus hygrophilus in your plant research, you might be wondering what exactly this species is and whether it belongs in your garden. Well, you’re not alone in your curiosity – this particular member of the ...

Lathyrus hygrophilus: The Mystery Pea of the Plant World

If you’ve stumbled upon the name Lathyrus hygrophilus in your plant research, you might be wondering what exactly this species is and whether it belongs in your garden. Well, you’re not alone in your curiosity – this particular member of the pea family (Fabaceae) is something of an enigma in the botanical world.

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

Lathyrus hygrophilus is a legitimate plant species, also known by its botanical synonym Lathyrus kilimandsharicus. However, here’s where things get interesting (and a bit frustrating for us plant enthusiasts): detailed information about this species is remarkably scarce. It’s like trying to solve a puzzle with most of the pieces missing!

Geographic Distribution and Native Range

Based on the synonym kilimandsharicus, which references Kilimanjaro, this species likely has connections to East Africa. However, the exact native range and current distribution remain unclear due to limited documentation.

Should You Plant Lathyrus hygrophilus?

Here’s where we need to pump the brakes a bit. While we can’t definitively say this plant is invasive or problematic, the lack of available information raises several red flags for home gardeners:

  • Unknown growing requirements and care needs
  • Uncertain hardiness zones and climate adaptability
  • No documented garden performance or behavior
  • Unclear availability from reputable nurseries
  • Possible rarity concerns

Better Alternatives for Your Garden

Instead of taking a gamble on this mysterious species, consider these well-documented native alternatives that offer similar legume benefits:

  • Wild bergamot and other native wildflowers for pollinator support
  • Native clover species for nitrogen fixation
  • Regional native legumes that are proven garden performers
  • Well-studied Lathyrus species native to your area

The Bottom Line

While Lathyrus hygrophilus might sound intriguing, sometimes the most responsible gardening choice is to stick with plants we understand well. The lack of cultivation information, growing guidelines, and ecological impact data makes this species a risky choice for most gardeners.

If you’re passionate about supporting biodiversity and trying unique plants, focus your energy on lesser-known but well-documented native species in your region. Your local native plant society or extension office can point you toward fascinating natives that will thrive in your specific conditions while supporting local ecosystems.

Remember, good gardening is often about making informed choices – and sometimes that means waiting until we have more information about mysterious species like this one!

Lathyrus Hygrophilus

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

Lathyrus L. - pea

Species

Lathyrus hygrophilus Taub.

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