Native Plants

Shockley’s Evening Primrose

Camissonia heterochroma

USDA symbol: CAHE12

annual forb

Lower 48 states: native

If you’re drawn to unique native plants with mysterious charm, Shockley’s evening primrose (Camissonia heterochroma) might just capture your gardening heart. This little-known annual forb belongs to the fascinating evening primrose family and calls the deserts of California and Nevada home. Camissonia heterochroma is a true American native, found naturally ...

Shockley’s Evening Primrose may be listed as rare in your area.
Global Conservation Status

Status: S3? | Vulnerable: Found only in a restricted range (even if abundant at some locations). Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals.

Shockley’s Evening Primrose: A Rare Desert Native Worth Knowing

If you’re drawn to unique native plants with mysterious charm, Shockley’s evening primrose (Camissonia heterochroma) might just capture your gardening heart. This little-known annual forb belongs to the fascinating evening primrose family and calls the deserts of California and Nevada home.

What Makes Shockley’s Evening Primrose Special

Camissonia heterochroma is a true American native, found naturally in the lower 48 states, specifically in California and Nevada. As an annual forb, this herbaceous plant completes its entire life cycle in one growing season, making it a fleeting but potentially rewarding addition to native plant gardens.

Like other members of the evening primrose family, this species likely produces delicate flowers that add subtle beauty to desert landscapes. The name evening primrose hints at blooms that may open in the evening hours, creating a magical twilight garden moment.

  • Species observed
  • No observations

A Word of Caution: Rarity Considerations

Before you start planning where to plant Shockley’s evening primrose, there’s something important to know. This species has a Global Conservation Status of S3?, which indicates an undefined conservation status. This uncertain ranking suggests the plant may be uncommon or that more research is needed to understand its population status.

If you choose to grow this plant, please ensure you source seeds or plants from reputable native plant suppliers who use ethical collection practices. Never collect from wild populations.

Garden Potential and Growing Considerations

As a native desert plant, Shockley’s evening primrose would likely thrive in:

  • Xeriscaped gardens designed for water conservation
  • Native plant gardens showcasing regional flora
  • Desert-themed landscapes
  • Natural areas being restored with local species

Being an annual, this plant would need to reseed itself or be replanted each year. This characteristic makes it perfect for gardeners who enjoy the surprise of where plants might pop up next season.

The Challenge of Growing Shockley’s Evening Primrose

Here’s where things get a bit tricky: specific growing information for Camissonia heterochroma is quite limited. As a desert native from California and Nevada, it likely prefers:

  • Well-draining, sandy or rocky soils
  • Full sun exposure
  • Minimal water once established
  • Hot, dry conditions similar to its native habitat

The exact USDA hardiness zones, specific soil requirements, and detailed care instructions aren’t well-documented for this particular species, making it more of an experimental choice for adventurous native plant gardeners.

Should You Grow Shockley’s Evening Primrose?

This plant is perfect for you if:

  • You’re passionate about preserving rare native species
  • You enjoy experimenting with lesser-known plants
  • You have experience growing desert natives
  • You can source the plant responsibly

You might want to skip it if:

  • You prefer plants with well-established growing guides
  • You’re new to native plant gardening
  • You can’t find ethically sourced material

Alternative Evening Primrose Options

If Shockley’s evening primrose proves difficult to source or grow, consider these related native evening primrose species that might be more readily available and better documented for your region. Many other Camissonia and Oenothera species offer similar desert charm with more established cultivation information.

Growing Shockley’s evening primrose is like befriending a rare, mysterious neighbor – it takes patience, respect, and the right approach, but the connection can be truly special. Just remember to tread lightly and source responsibly when dealing with this uncommon native beauty.

Camissonia heterochroma is also known as...

Often we refer to plants by their common names. When shopping for plants the scientific name is the best way to positively identify the plant species you desire. But some plants have more than one name! While it doesn't happen often, nurseries might display one name while you're searching for another. Camissonia heterochroma is also known as:

Camissonia heterochroma Raven ssp. monoensis | USDA symbol: CAHEM
Camissonia heterochroma Raven var. monoensis | USDA symbol: CAHEM2
Oenothera heterochroma | USDA symbol: OEHE4
Oenothera heterochroma Watson ssp. monoensis | USDA symbol: OEHEM
Oenothera heterochroma Watson var. monoensis | USDA symbol: OEHEM3

Why do some plants have more than one name? Over time plant species may be renamed for a few reasons:

  1. Botanists in different regions named the same plant without knowing it had already been classified.
  2. A species was reclassified after scientific advances in, for example, DNA analysis.
  3. Slight variations within a species are sometimes mistakenly identified as entirely new species.

Classification

Group: Dicot
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida - Dicotyledons
Subclass: Rosidae
Order: Myrtales
Family: Onagraceae Juss. - Evening Primrose family
Genus: Camissonia Link - suncup

Species: Camissonia heterochroma (S. Watson) P.H. Raven - Shockley's evening primrose

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