North America Non-native Plant

Hippocrepis Unisiliquosa

Botanical name: Hippocrepis unisiliquosa

USDA symbol: HIUN3

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

Hippocrepis unisiliquosa: A Mysterious Member of the Legume Family If you’ve stumbled across the name Hippocrepis unisiliquosa in your plant research, you’re likely dealing with one of botany’s more elusive characters. This species belongs to the fascinating Hippocrepis genus, part of the legume family (Fabaceae), but finding detailed information about ...

Hippocrepis unisiliquosa: A Mysterious Member of the Legume Family

If you’ve stumbled across the name Hippocrepis unisiliquosa in your plant research, you’re likely dealing with one of botany’s more elusive characters. This species belongs to the fascinating Hippocrepis genus, part of the legume family (Fabaceae), but finding detailed information about this particular plant is like searching for a needle in a haystack.

What We Know (And Don’t Know)

Here’s where things get interesting – and a bit frustrating for curious gardeners. While the botanical name Hippocrepis unisiliquosa exists in scientific literature, comprehensive details about its characteristics, native range, and growing requirements are surprisingly scarce. This could mean several things: the species might be extremely rare, recently described, or possibly even synonymous with another better-known species.

The genus name Hippocrepis comes from Greek words meaning horseshoe and appearance, referring to the distinctive horseshoe-shaped seed pods that characterize plants in this group. The species epithet unisiliquosa suggests something about having single pods, but without more specific information, we’re left to piece together clues.

The Legume Connection

What we can say with confidence is that as a member of the Fabaceae family, Hippocrepis unisiliquosa likely shares some traits with its better-known cousins:

  • Ability to fix nitrogen in the soil through root nodules
  • Compound leaves typical of the legume family
  • Seed pods (legumes) as fruits
  • Potential value for pollinators if it produces flowers

Should You Try to Grow It?

Here’s the honest truth: without knowing its native range, growing requirements, invasive potential, or even its current availability in the horticultural trade, it’s nearly impossible to recommend whether you should plant Hippocrepis unisiliquosa. The lack of information makes it a risky choice for home gardeners.

If you’re interested in the Hippocrepis genus, you might consider better-documented alternatives like Horseshoe Vetch (Hippocrepis comosa), which offers similar botanical interest with the added benefit of known growing requirements and ecological value.

The Mystery Continues

Sometimes in the plant world, we encounter species that remain tantalizingly out of reach – either because they’re incredibly rare, poorly studied, or exist primarily in scientific collections. Hippocrepis unisiliquosa appears to fall into this category.

If you’re a serious plant collector or researcher who has encountered this species, we’d love to hear from you! The gardening community thrives on shared knowledge, and mysterious plants like this one remind us that there’s still so much to discover in the botanical world.

For now, if you’re looking to add legumes to your garden that offer nitrogen fixation, wildlife benefits, and proven garden performance, consider exploring well-documented native species in your area. Your local extension office or native plant society can point you toward legumes that will thrive in your specific conditions while supporting local ecosystems.

Hippocrepis Unisiliquosa

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

Hippocrepis L. - hippocrepis

Species

Hippocrepis unisiliquosa L.

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