Native Plants

Bessey’s Locoweed

Oxytropis besseyi var. fallax

USDA symbol: OXBEF

perennial forb

Lower 48 states: native

Meet Bessey’s locoweed (Oxytropis besseyi var. fallax), a perennial wildflower that’s as uncommon in gardens as it is in the wild. This native North American plant might not be on every gardener’s wish list, but for those interested in rare native species and specialized wildflower gardens, it offers a unique ...

Bessey’s Locoweed may be listed as rare in your area.
Global Conservation Status

Status: S5T3 | Secure: At low or no risk of extinction in the area due to an extensive range, abundant populations, and with little to no concern of declines or threats.

Bessey’s Locoweed: A Rare Native Wildflower for Specialized Gardens

Meet Bessey’s locoweed (Oxytropis besseyi var. fallax), a perennial wildflower that’s as uncommon in gardens as it is in the wild. This native North American plant might not be on every gardener’s wish list, but for those interested in rare native species and specialized wildflower gardens, it offers a unique opportunity to support regional biodiversity.

What Makes Bessey’s Locoweed Special?

Bessey’s locoweed is a true native of the American West, specifically found in Montana and Wyoming. As a member of the legume family, this perennial forb plays an important ecological role in its native grassland and prairie habitats. Unlike woody shrubs or trees, this plant lacks significant woody tissue and maintains its perennating buds at or below ground level, helping it survive harsh winters.

The plant’s botanical classification places it in a specialized group within the Oxytropis genus, with the synonym Oxytropis nana var. fallax sometimes used in older botanical references.

Geographic Distribution and Rarity

This wildflower has a limited native range, growing naturally only in Montana and Wyoming. Its restricted distribution contributes to its Global Conservation Status of S5T3, indicating it requires careful consideration for conservation.

  • Species observed
  • No observations

Should You Plant Bessey’s Locoweed?

The decision to grow Bessey’s locoweed comes with important considerations:

  • Rarity concerns: With its limited distribution and conservation status, this plant should only be grown using responsibly sourced materials
  • Regional appropriateness: Best suited for gardens within or near its native range of Montana and Wyoming
  • Specialized growing requirements: Like many native prairie plants, it likely has specific soil and climate needs
  • Limited availability: You won’t find this at your typical garden center

Garden Applications

If you’re fortunate enough to live within its native range and can source it responsibly, Bessey’s locoweed works best in:

  • Native plant gardens focused on local flora
  • Prairie restoration projects
  • Specialized wildflower collections
  • Educational or conservation-focused landscapes

Growing Considerations

While specific growing information for this variety is limited, most Oxytropis species prefer:

  • Well-draining soils typical of prairie environments
  • Full sun exposure
  • Minimal water once established
  • Cool climate conditions matching their native range

A Word of Caution

The common name locoweed comes from the fact that many plants in this genus can be toxic to livestock when consumed in large quantities. While this isn’t typically a concern for home gardeners, it’s worth noting if you have grazing animals.

The Bottom Line

Bessey’s locoweed represents the fascinating diversity of North American native plants, but it’s not for every garden or every gardener. If you’re passionate about rare native species, live within its natural range, and can source it ethically, it could be a meaningful addition to a specialized native plant collection. For most gardeners, however, there are many more readily available native alternatives that can provide similar ecological benefits with less complexity.

Remember, the best native plant for your garden is one that naturally occurs in your local area and can be grown sustainably without impacting wild populations.

Oxytropis besseyi var. fallax is also known as...

Often we refer to plants by their common names. When shopping for plants the scientific name is the best way to positively identify the plant species you desire. But some plants have more than one name! While it doesn't happen often, nurseries might display one name while you're searching for another. Oxytropis besseyi var. fallax is also known as:

Oxytropis nana var. fallax | USDA symbol: OXNAF

Why do some plants have more than one name? Over time plant species may be renamed for a few reasons:

  1. Botanists in different regions named the same plant without knowing it had already been classified.
  2. A species was reclassified after scientific advances in, for example, DNA analysis.
  3. Slight variations within a species are sometimes mistakenly identified as entirely new species.

Classification

Group: Dicot
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida - Dicotyledons
Subclass: Rosidae
Order: Fabales
Family: Fabaceae Lindl. - Pea family
Genus: Oxytropis DC. - locoweed

Species: Oxytropis besseyi (Rydb.) Blank. - Bessey's locoweed

Variety: Oxytropis besseyi (Rydb.) Blank. var. fallax Barneby - Bessey's locoweed

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