Native Plants

Pineoak Jewelflower

Streptanthus squamiformis

USDA symbol: STSQ

annual forb

Lower 48 states: native

Meet the pineoak jewelflower (Streptanthus squamiformis), a charming little annual that’s definitely not your typical garden center find. This modest native wildflower might not win any beauty contests, but it holds a special place in the hearts of native plant enthusiasts and conservationists alike. This delicate annual forb belongs to ...

Pineoak Jewelflower may be listed as rare in your area.
Global Conservation Status

Status: S2S3 | 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.

Arkansas

Status: S2 | Imperiled: Extremely rare. Typically 6 to 20 occurrences or 1,000 to 3,000 remaining individuals.

Pineoak Jewelflower: A Rare Native Gem for Specialty Gardens

Meet the pineoak jewelflower (Streptanthus squamiformis), a charming little annual that’s definitely not your typical garden center find. This modest native wildflower might not win any beauty contests, but it holds a special place in the hearts of native plant enthusiasts and conservationists alike.

What Makes Pineoak Jewelflower Special?

This delicate annual forb belongs to the mustard family and showcases the subtle beauty that native plants are known for. As an herbaceous plant without woody stems, it completes its entire life cycle in just one growing season, making every bloom precious and fleeting.

The pineoak jewelflower is native to the lower 48 states, specifically calling Arkansas and Oklahoma home. You’ll find it naturally occurring in the beautiful Ouachita Mountains region, where it has adapted to the unique conditions of this special ecosystem.

  • Species observed
  • No observations

A Word of Caution: Rarity Matters

Here’s where things get important – this little beauty is rare. With a Global Conservation Status of S2S3 and an S2 rarity status in Arkansas, the pineoak jewelflower needs our protection. If you’re considering adding this species to your garden, please make sure you’re sourcing seeds or plants from reputable native plant nurseries that practice ethical collection methods. Never collect from wild populations!

Garden Design and Landscape Role

The pineoak jewelflower isn’t going to be your garden’s showstopper, but that’s not necessarily a bad thing. This understated annual works beautifully in:

  • Native plant collections focused on regional flora
  • Rock gardens with well-draining conditions
  • Naturalized wildflower areas
  • Conservation gardens highlighting rare species

Its modest stature and delicate flowers make it perfect for close-up viewing in smaller spaces where its subtle charms can be appreciated.

Growing Conditions and Care

Like many native plants, pineoak jewelflower appreciates conditions similar to its natural habitat. It thrives in USDA hardiness zones 6-8 and prefers:

  • Well-draining soils (rocky or sandy soils work well)
  • Partial shade to full sun exposure
  • Minimal soil amendments – it’s adapted to lean soils

As an annual, this plant will complete its life cycle in one growing season, so you’ll need to allow it to self-seed or collect seeds for next year’s garden.

Planting and Maintenance Tips

The best approach for growing pineoak jewelflower is direct seeding in fall, mimicking natural conditions. Here are some key tips:

  • Sow seeds in late fall for spring germination
  • Provide minimal care once established – overwatering can be harmful
  • Allow plants to go to seed to maintain populations
  • Avoid fertilizing, as rich soils may not suit this species

Supporting Local Wildlife

While specific wildlife benefits aren’t well-documented for this rare species, like other members of the mustard family, pineoak jewelflower likely provides nectar for small native bees and other pollinators during its blooming period.

Should You Grow Pineoak Jewelflower?

This plant is definitely for the serious native plant gardener rather than the casual flower enthusiast. If you’re passionate about conservation, regional flora, or simply love the idea of growing something truly unique and rare, pineoak jewelflower could be a wonderful addition to your collection.

Just remember – with great rarity comes great responsibility. Only source this plant ethically, and consider it a privilege to help preserve this special piece of Arkansas and Oklahoma’s natural heritage in your own backyard.

Whether you choose to grow it or not, knowing about rare natives like pineoak jewelflower helps us appreciate the incredible diversity of plants that call our regions home – and reminds us why protecting their wild habitats matters so much.

Classification

Group: Dicot
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida - Dicotyledons
Subclass: Dilleniidae
Order: Capparales
Family: Brassicaceae Burnett - Mustard family
Genus: Streptanthus Nutt. - twistflower

Species: Streptanthus squamiformis Goodman - pineoak jewelflower

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