Native Plants

Suksdorf’s Milkvetch

Astragalus pulsiferae var. suksdorfii

USDA symbol: ASPUS

perennial forb

Lower 48 states: native

If you’re drawn to rare and unique native plants, Suksdorf’s milkvetch (Astragalus pulsiferae var. suksdorfii) might catch your attention. But before you start planning where to plant it, there are some important things you should know about this uncommon perennial. Suksdorf’s milkvetch is a perennial plant native to the western ...

Suksdorf’s Milkvetch may be listed as rare in your area.
Global Conservation Status

Status: S4T2 | Apparently Secure: Uncommon but not rare, and usually widespread. Possible cause for longterm concern. Typically more than 100 occurrences in the state or more than 10,000 individuals.

Suksdorf’s Milkvetch: A Rare Native Worth Protecting

If you’re drawn to rare and unique native plants, Suksdorf’s milkvetch (Astragalus pulsiferae var. suksdorfii) might catch your attention. But before you start planning where to plant it, there are some important things you should know about this uncommon perennial.

What Makes This Plant Special

Suksdorf’s milkvetch is a perennial plant native to the western United States, specifically found in California and Nevada. As a member of the legume family, it likely shares the nitrogen-fixing abilities that make many milkvetches valuable for soil improvement and ecosystem health.

This plant calls the lower 48 states home, representing part of our native botanical heritage in the American West.

  • Species observed
  • No observations

A Word of Caution: Rarity Matters

Here’s where things get important: Suksdorf’s milkvetch has a conservation status of S4T2, which indicates this variety may be of conservation concern. When a plant falls into this category, we need to be extra thoughtful about how we approach growing it.

If you’re interested in growing this plant, please only source it responsibly:

  • Purchase from reputable native plant nurseries that propagate their own stock
  • Never collect seeds or plants from wild populations
  • Consider supporting conservation efforts for rare plants instead
  • Ask nurseries about the origin of their plant material

Growing Considerations

Unfortunately, detailed growing information for this specific variety is quite limited. Like other milkvetches, it’s likely adapted to the arid conditions of its native range in California and Nevada. Most plants in this family prefer:

  • Well-draining soils
  • Full sun exposure
  • Minimal summer water once established
  • Rocky or sandy soil conditions

Alternative Native Options

Given the rarity of Suksdorf’s milkvetch, you might consider other native milkvetch species that are more readily available and better documented. Many Astragalus species offer similar ecological benefits, including nitrogen fixation and support for native pollinators, without the conservation concerns.

Check with your local native plant society or extension office for milkvetch species that are both native to your area and more common in cultivation.

The Bottom Line

While Suksdorf’s milkvetch is undoubtedly an interesting native plant, its rarity means we should approach it with respect and caution. If you’re passionate about rare plant conservation, consider supporting botanical gardens, seed banks, or conservation organizations that work to protect species like this one.

For most gardeners, focusing on more common native alternatives will give you similar ecological benefits while supporting broader native plant gardening goals. Sometimes the best way to love a rare plant is to admire it from afar and let the experts handle its conservation.

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: Astragalus L. - milkvetch

Species: Astragalus pulsiferae A. Gray - Ames' milkvetch

Variety: Astragalus pulsiferae A. Gray var. suksdorfii (Howell) Barneby - Suksdorf's milkvetch

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