North America Native Plant

Vasek’s Clarkia

Botanical name: Clarkia tembloriensis calientensis

USDA symbol: CLTEC

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Clarkia calientensis Vasek (CLCA4)   

Vasek’s Clarkia: A Rare California Endemic You Probably Shouldn’t Grow Meet Vasek’s clarkia (Clarkia tembloriensis calientensis), one of California’s most elusive wildflowers. While you might be tempted to add this unique annual to your native plant garden, this little beauty comes with some serious conservation considerations that every responsible gardener ...

Rare plant alert!

Region: Conservation status by state

Status: S3T1: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘ 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 ⚘

Vasek’s Clarkia: A Rare California Endemic You Probably Shouldn’t Grow

Meet Vasek’s clarkia (Clarkia tembloriensis calientensis), one of California’s most elusive wildflowers. While you might be tempted to add this unique annual to your native plant garden, this little beauty comes with some serious conservation considerations that every responsible gardener should know about.

What Makes Vasek’s Clarkia Special

Vasek’s clarkia is a subspecies of the Temblor Range clarkia, scientifically known as Clarkia tembloriensis calientensis (though you might also see it listed under its synonym, Clarkia calientensis Vasek). This herbaceous annual belongs to the evening primrose family and represents one of nature’s more exclusive club members.

Where Does It Call Home?

This rare subspecies is a true California native, found only within the Golden State’s borders. Its distribution is extremely limited, making it one of those plants that exists in just a handful of very specific locations.

The Rarity Reality Check

Here’s where things get serious: Vasek’s clarkia carries a Global Conservation Status of S3T1, which indicates significant conservation concern. This isn’t your typical backyard wildflower – it’s a plant teetering on the edge of rarity that deserves our protection rather than our cultivation attempts.

Important: If you’re considering growing this plant, please think twice. Its extreme rarity means that any seeds or plants should only come from verified, ethically sourced conservation programs, not wild collection.

Growing Considerations (If You Must)

Given the lack of readily available information about this subspecies’ specific growing requirements, successful cultivation would be extremely challenging even for experienced native plant gardeners. As an annual forb, it completes its entire life cycle in one growing season, but beyond that basic fact, detailed growing guidance is scarce.

Better Alternatives for Your Garden

Instead of risking impact on wild populations of this rare subspecies, consider these more common and garden-appropriate Clarkia species:

  • Farewell-to-spring (Clarkia amoena) – gorgeous cup-shaped flowers
  • Elegant clarkia (Clarkia unguiculata) – delicate, ruffled blooms
  • Winecup clarkia (Clarkia purpurea) – deep purple chalice-shaped flowers

These alternatives will give you the charming Clarkia aesthetic while supporting conservation efforts for rarer species like Vasek’s clarkia.

The Bottom Line

Vasek’s clarkia is undoubtedly fascinating, but it’s one of those plants best admired from afar. As native plant enthusiasts, our role is to support conservation of rare species like this one by choosing more common alternatives for our gardens. Let’s leave Vasek’s clarkia to thrive in its natural habitat while we celebrate the beauty of more readily available native wildflowers in our own outdoor spaces.

Remember: the best way to honor rare native plants is often to appreciate them without disturbing them. Your garden can still be a native plant paradise with species that don’t carry the conservation concerns of this remarkable little Californian endemic.

Vasek’s Clarkia

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

Myrtales

Family

Onagraceae Juss. - Evening Primrose family

Genus

Clarkia Pursh - clarkia

Species

Clarkia tembloriensis Vasek - Temblor Range clarkia

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