North America Native Plant

Noel’s Owl’s-clover

Botanical name: Orthocarpus tolmiei holmgreniorum

USDA symbol: ORTOH

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Noel’s Owl’s-Clover: A Rare Native Wildflower Worth Knowing If you’re passionate about native plants and love discovering botanical treasures, you might be intrigued by Noel’s owl’s-clover (Orthocarpus tolmiei holmgreniorum). This uncommon annual wildflower represents one of nature’s more specialized creations, found only in select locations across the American West. What ...

Rare plant alert!

Region: Conservation status by state

Status: S4T3?: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ Subspecies or variety is vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals. ⚘ 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 ⚘

Noel’s Owl’s-Clover: A Rare Native Wildflower Worth Knowing

If you’re passionate about native plants and love discovering botanical treasures, you might be intrigued by Noel’s owl’s-clover (Orthocarpus tolmiei holmgreniorum). This uncommon annual wildflower represents one of nature’s more specialized creations, found only in select locations across the American West.

What Makes This Plant Special

Noel’s owl’s-clover belongs to a fascinating group of plants called forbs – essentially herbaceous flowering plants that aren’t grasses, sedges, or rushes. As an annual, this little wildflower completes its entire life cycle in a single growing season, making every encounter with it somewhat precious.

What sets this particular subspecies apart is its extremely limited range and uncertain conservation status. With a Global Conservation Status of S4T3? (meaning the status is undefined but potentially of concern), this plant sits in that gray area where botanists are still figuring out exactly how rare it really is.

Where You’ll Find It Growing Wild

Noel’s owl’s-clover has carved out its niche in just two states: Idaho and Utah. This narrow distribution makes it a true regional specialty – think of it as the botanical equivalent of a local delicacy that you can’t find anywhere else.

Should You Grow Noel’s Owl’s-Clover?

Here’s where things get interesting for home gardeners. While this native wildflower certainly has appeal for those creating authentic regional landscapes, its rarity raises some important considerations:

  • Conservation Responsibility: If you’re determined to grow this plant, make absolutely sure you source seeds or plants from reputable native plant suppliers who collect responsibly
  • Limited Availability: Don’t expect to find this at your local garden center – it’s more of a specialty item for serious native plant enthusiasts
  • Regional Authenticity: If you live in Idaho or Utah, this could be a wonderful addition to a truly local native plant garden
  • Annual Nature: Remember, you’ll need to replant or allow self-seeding each year

Growing Conditions and Care

Unfortunately, specific growing information for this subspecies is limited in gardening literature. However, based on its native habitat in Idaho and Utah, we can make some educated assumptions:

  • Likely prefers well-draining soils typical of western landscapes
  • Probably adapted to relatively dry conditions once established
  • As a native forb, it should integrate well with other regional wildflowers and grasses
  • Being annual, it will likely self-seed under favorable conditions

The Bottom Line for Gardeners

Noel’s owl’s-clover represents one of those plants that’s more important from a conservation and botanical interest standpoint than as a typical garden plant. If you’re in Idaho or Utah and passionate about preserving local flora, this could be a meaningful addition to a specialized native plant collection.

However, for most gardeners, there are more readily available owl’s-clover relatives that can provide similar ecological benefits without the conservation concerns. Consider exploring other Orthocarpus species or related native wildflowers that are more common and better suited to cultivation.

If you do decide to grow Noel’s owl’s-clover, approach it as a conservation project rather than just another pretty flower for the garden. Source responsibly, document your success (or failures), and consider sharing seeds with other conservation-minded gardeners to help preserve this unique piece of our native plant heritage.

Noel’s Owl’s-clover

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

Scrophulariales

Family

Scrophulariaceae Juss. - Figwort family

Genus

Orthocarpus Nutt. - owl's-clover

Species

Orthocarpus tolmiei Hook. & Arn. - Tolmie's owl's-clover

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