North America Native Plant

Warner Mountains Bedstraw

Botanical name: Galium serpenticum warnerense

USDA symbol: GASEW

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Warner Mountains Bedstraw: A Rare Native Gem Worth Protecting If you’re looking for a truly unique addition to your native plant garden, Warner Mountains bedstraw (Galium serpenticum warnerense) might catch your eye. But before you start planning where to plant it, there are some important things you need to know ...

Rare plant alert!

Region: Conservation status by state

Status: S4S5T2: 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) ⚘ Apparently Secure: Uncommon but not rare, and usually widespread. Possibly cause for longterm concern. Typically more than 100 occurrences in the state or more than 10,000 individuals ⚘ 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. ⚘

Warner Mountains Bedstraw: A Rare Native Gem Worth Protecting

If you’re looking for a truly unique addition to your native plant garden, Warner Mountains bedstraw (Galium serpenticum warnerense) might catch your eye. But before you start planning where to plant it, there are some important things you need to know about this special little perennial.

What Makes This Plant Special?

Warner Mountains bedstraw is a native forb herb that belongs to the fascinating world of bedstraws – those delicate, often overlooked plants that add subtle beauty to natural landscapes. As a perennial, it comes back year after year, though it lacks the woody stems of shrubs and trees. Instead, it’s what botanists call a forb – essentially a soft-stemmed flowering plant that dies back to ground level each winter.

Where Does It Call Home?

This bedstraw is a true West Coast native, naturally occurring in California, Oregon, and Washington. It’s perfectly adapted to the unique conditions of the Pacific Northwest and northern California regions, making it a legitimate choice for gardeners in these areas who want to support local ecosystems.

The Rarity Factor: Why You Should Proceed with Caution

Here’s where things get serious. Warner Mountains bedstraw has a Global Conservation Status of S4S5T2, which indicates it’s considered rare or uncommon in its natural habitat. This isn’t a plant you’ll find at your local nursery, and for good reason – it needs protection in the wild.

If you’re absolutely set on growing this plant, you must ensure any material is responsibly sourced. This means:

  • Never collect from wild populations
  • Only purchase from reputable native plant nurseries that propagate their own stock
  • Consider growing it only if you’re participating in conservation efforts
  • Be prepared that it may not be available at all

Growing Challenges and Unknowns

Here’s the honest truth: there’s limited information available about successfully cultivating Warner Mountains bedstraw in home gardens. This lack of horticultural knowledge, combined with its rarity, makes it a challenging choice for most gardeners.

What we do know is that it’s adapted to the specific conditions of its native range, which likely includes well-draining soils and the climate patterns of the western states where it naturally occurs.

Better Alternatives for Your Garden

Instead of potentially impacting wild populations of this rare bedstraw, consider these more readily available native alternatives:

  • Sweet-scented bedstraw (Galium triflorum) – widely available and great for woodland gardens
  • Northern bedstraw (Galium boreale) – beautiful white flowers and more garden-friendly
  • Other native groundcovers specific to your region

The Bottom Line

Warner Mountains bedstraw represents the kind of plant that makes native gardening both exciting and responsible. While its rarity makes it impractical for most home gardens, learning about plants like this reminds us of the incredible diversity in our native flora and the importance of protecting it.

If you’re passionate about rare plants and conservation, connect with local native plant societies or botanical gardens that might be working with this species. Otherwise, choose more common native bedstraws that will give you similar ecological benefits without impacting rare populations.

Remember, the best native gardening practices involve growing plants that are both appropriate for your specific location and readily available through sustainable sources. Sometimes the most responsible thing we can do is admire rare plants in their natural habitats and choose more common alternatives for our gardens.

Warner Mountains Bedstraw

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Rubiales

Family

Rubiaceae Juss. - Madder family

Genus

Galium L. - bedstraw

Species

Galium serpenticum Dempster - Intermountain bedstraw

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