North America Native Plant

Mono Hot Springs Evening Primrose

Botanical name: Camissonia sierrae alticola

USDA symbol: CASIA

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Mono Hot Springs Evening Primrose: A Rare California Native Worth Protecting If you’re passionate about growing truly unique native plants, the Mono Hot Springs evening primrose might just capture your imagination. This little-known California native, scientifically called Camissonia sierrae alticola, represents one of those special botanical treasures that make native ...

Rare plant alert!

Region: Conservation status by state

Status: S3T2: 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) ⚘ 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 ⚘

Mono Hot Springs Evening Primrose: A Rare California Native Worth Protecting

If you’re passionate about growing truly unique native plants, the Mono Hot Springs evening primrose might just capture your imagination. This little-known California native, scientifically called Camissonia sierrae alticola, represents one of those special botanical treasures that make native gardening so rewarding – and so important for conservation.

What Makes This Plant Special

The Mono Hot Springs evening primrose is an annual forb, which simply means it’s a soft-stemmed plant that completes its entire life cycle in one growing season. Unlike woody shrubs or trees, this delicate native lacks significant woody tissue and instead relies on its herbaceous growth to make its mark in the landscape each year.

What truly sets this plant apart is its rarity. With a Global Conservation Status of S3T2, this evening primrose is considered uncommon and potentially at risk. This rarity status makes it a plant of special conservation concern.

Where You’ll Find It Growing Wild

This evening primrose calls California home, specifically areas around the Sierra Nevada region. As its common name suggests, it has connections to the Mono Hot Springs area, giving us a clue about the type of environment it prefers in nature.

Should You Grow Mono Hot Springs Evening Primrose?

Here’s where things get interesting – and important. While this native plant would be a fascinating addition to any California native garden, its rarity means we need to approach it with extra care and responsibility.

The Conservation Angle

Because of its uncommon status, you should only consider growing this plant if you can source it responsibly. This means:

  • Purchasing from reputable native plant nurseries that propagate from ethically collected seed
  • Never collecting plants or seeds from wild populations
  • Considering it as part of a conservation effort rather than just a garden novelty

Garden Suitability

As an annual plant, the Mono Hot Springs evening primrose offers a different kind of garden experience than perennial natives. Each year brings the excitement of new growth from seed, making it perfect for gardeners who enjoy the seasonal rhythm of annual plants.

Being a California native, it’s naturally adapted to the state’s Mediterranean climate patterns and would fit beautifully into native plant gardens, restoration projects, or specialized collections of rare California flora.

Growing Challenges and Considerations

Unfortunately, specific growing information for this rare plant is quite limited, which presents both a challenge and an opportunity for dedicated native plant enthusiasts. The lack of readily available cultivation information suggests that growing this plant successfully might require some experimentation and patience.

As with most California natives, it likely prefers well-draining soil and follows the state’s natural wet winter, dry summer pattern. Being an annual, timing of seeding would be crucial for success.

The Bottom Line

The Mono Hot Springs evening primrose represents something special in the world of native plants – a rare California endemic that connects us directly to specific places and ecosystems. While it may not be the easiest plant to grow or find, it offers dedicated native plant gardeners a chance to participate in conservation while growing something truly unique.

If you’re drawn to this rare beauty, approach it with respect for its conservation status. Work with native plant societies, participate in seed collection efforts through proper channels, and consider it as part of a larger commitment to preserving California’s botanical heritage.

Sometimes the most rewarding plants in our gardens are not the showiest or easiest to grow, but the ones that connect us most deeply to the wild places we’re working to protect.

Mono Hot Springs Evening Primrose

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

Camissonia Link - suncup

Species

Camissonia sierrae P.H. Raven - Sierra suncup

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