North America Native Plant

Lesser Rushy Milkvetch

Botanical name: Astragalus convallarius var. margaretiae

USDA symbol: ASCOM4

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Lesser Rushy Milkvetch: A Rare Nevada Native Worth Protecting Meet the lesser rushy milkvetch (Astragalus convallarius var. margaretiae), a perennial plant that’s as elusive as its name suggests. This native Nevada species belongs to the fascinating world of milkvetches, but don’t expect to find much information about this particular variety ...

Rare plant alert!

Region: Conservation status by state

Status: S5T2: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 6 to 20 occurrences or few remaining individuals (1,000 to 3,000) ⚘ Secure: At very low or no risk of extinction in the jurisdiction due to a very extensive range, abundant populations or occurrences, with little to no concern from declines or threats. ⚘

Lesser Rushy Milkvetch: A Rare Nevada Native Worth Protecting

Meet the lesser rushy milkvetch (Astragalus convallarius var. margaretiae), a perennial plant that’s as elusive as its name suggests. This native Nevada species belongs to the fascinating world of milkvetches, but don’t expect to find much information about this particular variety in your typical gardening guides – and there’s a very good reason for that.

A Nevada Exclusive with a Conservation Story

The lesser rushy milkvetch calls Nevada home and is native to the lower 48 states, specifically found growing in the Silver State’s unique landscapes. This isn’t your run-of-the-mill garden center find, though. With a Global Conservation Status of S5T2, this variety occupies a special place in the conservation world that gardeners should be aware of before considering it for their landscapes.

Rarity Alert: Handle with Care

Here’s where things get important for responsible gardeners: the lesser rushy milkvetch’s S5T2 conservation status indicates this is a rare variety that deserves our respect and protection. If you’re considering adding this plant to your garden, it’s crucial to source it responsibly. This means:

  • Only purchasing from reputable native plant nurseries that ethically propagate their stock
  • Never collecting plants from wild populations
  • Ensuring any plant material comes with proper documentation
  • Supporting conservation efforts for rare native species

The Mystery of Growing Lesser Rushy Milkvetch

Unfortunately, specific growing information for this particular variety remains as elusive as the plant itself. The limited documentation available doesn’t provide clear guidance on preferred growing conditions, hardiness zones, or specific care requirements that would typically help gardeners succeed with a new plant.

This lack of detailed cultivation information actually reinforces why this variety is so special – it’s likely adapted to very specific conditions in its Nevada habitat and may not be well-suited to typical garden settings.

Should You Plant Lesser Rushy Milkvetch?

Given the rarity status and limited growing information available, most home gardeners might want to consider supporting this species through conservation donations rather than attempting to grow it. However, if you’re an experienced native plant gardener with access to responsibly sourced material and appropriate Nevada-like conditions, you could play a valuable role in conservation efforts.

For gardeners interested in supporting native Nevada plants with more readily available information and growing guidance, consider exploring other Astragalus species or native Nevada perennials that are better documented and more widely available through ethical sources.

Supporting Conservation

Sometimes the best way to grow a rare plant is to support its conservation in the wild. Consider contributing to native plant societies, botanical gardens, or conservation organizations working to protect Nevada’s unique flora. Your support helps ensure that future generations might have better opportunities to appreciate and responsibly cultivate rare species like the lesser rushy milkvetch.

Remember, when it comes to rare native plants, sometimes admiring from afar and supporting in-situ conservation efforts is the most garden-friendly approach of all.

Lesser Rushy Milkvetch

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

Astragalus L. - milkvetch

Species

Astragalus convallarius Greene - lesser rushy milkvetch

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