Slender Goldenbanner: A Lesser-Known Western Wildflower
If you’ve been searching for unique native plants to add diversity to your garden, you might have stumbled across slender goldenbanner (Thermopsis gracilis var. ovata). This perennial wildflower belongs to the legume family and represents a specific variety of the broader slender goldenbanner species. While not as commonly discussed as its more famous cousins, this plant has its own interesting story to tell.
What Exactly Is Slender Goldenbanner?
Slender goldenbanner is a herbaceous perennial forb, which simply means it’s a non-woody flowering plant that comes back year after year. Unlike shrubs or trees, it lacks significant woody tissue and instead relies on underground structures to survive winter and regrow each spring.
You might also encounter this plant listed under several scientific synonyms in older botanical references, including Thermopsis montana var. ovata or Thermopsis ovata, which can make researching this particular variety a bit like botanical detective work!
Where Does It Come From?
This variety has an interesting geographic story. While it’s considered native to several western United States including Idaho, Montana, Nevada, Oregon, and Washington, it has also established itself in parts of Canada, specifically Prince Edward Island and Newfoundland, where it’s classified as a non-native species that reproduces on its own.
- Species observed
- No observations
The Challenge with This Particular Variety
Here’s where things get honest: specific information about Thermopsis gracilis var. ovata is surprisingly limited in readily available horticultural and botanical literature. This particular variety seems to fly under the radar compared to other Thermopsis species that are more commonly cultivated and studied.
What we do know is limited:
- It’s a perennial that should return each year
- As a legume family member, it likely has nitrogen-fixing capabilities
- Its natural range suggests it’s adapted to cooler, northern climates
- The goldenbanner name suggests yellow flowers typical of the genus
Should You Plant It?
Given the limited specific information available and the unclear cultivation requirements for this particular variety, it might be challenging for home gardeners to grow successfully. The lack of readily available seeds or plants through commercial sources also presents a practical hurdle.
If you’re drawn to the Thermopsis genus for your garden, you might have better success with more commonly available species like:
- Carolina bush pea (Thermopsis villosa)
- Golden banner (Thermopsis montana)
- Other regional Thermopsis species with established cultivation guidelines
A Word of Caution
Since this variety has established itself outside its native range, and we don’t have clear information about its growth habits or potential invasiveness, it’s worth exercising caution. Before considering cultivation, check with your local extension office or native plant society about appropriate alternatives that are definitely native to your specific region.
The Bottom Line
While slender goldenbanner var. ovata is undoubtedly an interesting plant from a botanical perspective, the limited available information makes it a challenging choice for most gardeners. Sometimes the most responsible approach is to admire a plant’s uniqueness while choosing better-documented alternatives that will give you a higher chance of gardening success.
If you’re passionate about growing lesser-known native plants, consider connecting with botanical gardens, native plant societies, or university extension programs in regions where this variety naturally occurs. They might have more detailed cultivation information or be able to point you toward similar, better-documented species that would thrive in your garden.