North America Native Plant

Secund Jewelflower

Botanical name: Streptanthus glandulosus secundus var. sonomensis

USDA symbol: STGLS4

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Secund Jewelflower: A Rare California Native Worth Knowing Meet the secund jewelflower (Streptanthus glandulosus secundus var. sonomensis), a charming but elusive California native that’s as rare as it is intriguing. This little-known annual wildflower belongs to the mustard family and represents a unique piece of California’s botanical heritage that deserves ...

Rare plant alert!

Region: Conservation status by state

Status: S4T2T3Q: Status is uncertain but is somewhere between the following rankings: Uncertain taxonomy: ⚘ 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) ⚘ 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 ⚘

Secund Jewelflower: A Rare California Native Worth Knowing

Meet the secund jewelflower (Streptanthus glandulosus secundus var. sonomensis), a charming but elusive California native that’s as rare as it is intriguing. This little-known annual wildflower belongs to the mustard family and represents a unique piece of California’s botanical heritage that deserves our attention and protection.

Where You’ll Find This Botanical Gem

The secund jewelflower is endemic to California, meaning it calls only the Golden State home. This makes it a true California original – a plant that evolved here and exists nowhere else on Earth. Its limited distribution adds to both its conservation value and its appeal for native plant enthusiasts who appreciate botanical rarities.

Understanding Its Conservation Status

Here’s where things get serious: this variety has a global conservation status of S4T2T3Q, which translates to uncommon to rare. This isn’t a plant you’ll stumble across at your local nursery, and there’s a good reason for that. Its rarity means we need to be thoughtful about how we interact with it in the wild and in cultivation.

Important note: If you’re considering adding this plant to your garden, please ensure any seeds or plants come from responsibly sourced, legally obtained material. Never collect from wild populations.

What Makes It Special

As an annual forb, the secund jewelflower completes its entire life cycle in a single growing season. It’s a herbaceous plant without significant woody tissue, typical of many wildflowers that paint California’s landscapes with seasonal color. The jewelflower part of its name hints at the delicate beauty that members of this genus possess – small but captivating blooms that reward close observation.

Garden Considerations

Given its rarity status, the secund jewelflower isn’t really a practical choice for most home gardens. However, if you’re passionate about conserving rare California natives and can source material responsibly, here’s what you should know:

  • It’s an annual, so you’ll need to replant or allow it to self-seed each year
  • As a California native, it’s adapted to the state’s Mediterranean climate
  • Being a forb, it works well in wildflower gardens or naturalized areas
  • Its small stature makes it suitable for rock gardens or specialized native plant collections

Supporting Conservation

Rather than trying to grow this rare variety, consider these alternatives that support conservation while satisfying your native plant enthusiasm:

  • Plant more common Streptanthus species if available
  • Support botanical gardens and conservation organizations working to protect rare plants
  • Participate in citizen science projects that monitor rare plant populations
  • Choose other California native annuals that provide similar ecological benefits without conservation concerns

The Bigger Picture

The secund jewelflower represents something larger than just one small plant – it’s part of California’s incredible botanical diversity and evolutionary story. While most of us won’t grow it in our gardens, knowing about plants like this helps us appreciate the complexity and fragility of our native ecosystems.

Sometimes the most responsible way to love a plant is to admire it from afar and work to protect the places where it naturally thrives. In the case of Streptanthus glandulosus secundus var. sonomensis, that might just be the most garden-worthy quality of all.

Secund Jewelflower

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Capparales

Family

Brassicaceae Burnett - Mustard family

Genus

Streptanthus Nutt. - twistflower

Species

Streptanthus glandulosus Hook. - bristly jewelflower

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