North America Native Plant

Carlquist’s Tarweed

Botanical name: Carlquistia

USDA symbol: CARLQ

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Carlquist’s Tarweed: A Rare California Native Worth Knowing If you’re a California native plant enthusiast always on the lookout for something truly unique, you might have stumbled across the intriguing Carlquist’s tarweed (Carlquistia). This little-known perennial forb represents one of those fascinating botanical mysteries that make native gardening such an ...

Carlquist’s Tarweed: A Rare California Native Worth Knowing

If you’re a California native plant enthusiast always on the lookout for something truly unique, you might have stumbled across the intriguing Carlquist’s tarweed (Carlquistia). This little-known perennial forb represents one of those fascinating botanical mysteries that make native gardening such an adventure.

What Makes Carlquist’s Tarweed Special

Carlquist’s tarweed is a herbaceous perennial that belongs to the diverse world of California’s native flora. As a forb, it lacks the woody tissue you’d find in shrubs and trees, instead growing as a soft-stemmed plant that dies back to its base each year, only to emerge again when conditions are right.

This plant is named after Sherwin Carlquist, a renowned botanist who made significant contributions to our understanding of plant evolution and island biogeography. Having a plant named after you? Now that’s a legacy worth celebrating!

Where You’ll Find It

Carlquist’s tarweed is exclusively native to California, making it a true Golden State endemic. However, don’t expect to spot it on every hiking trail – this appears to be one of those special plants with very specific habitat requirements and a limited range.

Should You Grow Carlquist’s Tarweed?

Here’s where things get interesting – and a bit complicated. While the idea of growing such a unique California native is appealing, there are several important considerations:

  • Limited availability: You’re unlikely to find this plant at your local nursery
  • Unknown growing requirements: Specific care instructions aren’t well documented
  • Potential rarity concerns: The limited information suggests this may be a rare species
  • Specialized habitat needs: Like many tarweeds, it likely has very specific environmental requirements

A Word of Caution

Given the limited information available about Carlquist’s tarweed and its apparent rarity, we strongly recommend proceeding with extreme caution. If you’re interested in this plant, it’s crucial to:

  • Only obtain plants from reputable, ethical sources
  • Verify that any material has been responsibly propagated, not wild-collected
  • Consider whether your garden can truly meet its needs
  • Consult with local native plant societies or botanists

Better Alternatives for Your Native Garden

While Carlquist’s tarweed might remain elusive, California offers plenty of other wonderful tarweed species and related plants that are more readily available and better understood:

  • Grindelia species (gumweeds) for sunny, dry spots
  • Layia species (tidytips) for colorful spring displays
  • Madia species (other tarweeds) for late-season blooms
  • Eriophyllum lanatum (Oregon sunshine) for golden flowers

The Bigger Picture

Sometimes the most valuable plants are the ones that remind us how much we still don’t know about our native flora. Carlquist’s tarweed serves as a gentle reminder that there are still botanical treasures out there waiting to be better understood, studied, and potentially conserved.

If you’re passionate about rare California natives, consider supporting botanical research, conservation efforts, and seed banking programs that work to protect and understand species like Carlquist’s tarweed. Your garden might not be able to showcase this particular plant, but you can still play a role in ensuring it has a future in the wild.

The Takeaway

While Carlquist’s tarweed might not be destined for your garden beds anytime soon, it represents the incredible diversity and mystery that makes California’s native plant world so captivating. Sometimes the best way to appreciate a rare plant is to support its conservation and learn about the amazing ecosystem relationships that keep our native landscapes thriving.

Stick with well-documented, readily available natives for your garden, and save the botanical detective work for your nature walks. Your garden – and California’s wild places – will thank you for it.

Carlquist’s Tarweed

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Asterales

Family

Asteraceae Bercht. & J. Presl - Aster family

Genus

Carlquistia B.G. Baldw. - Carlquist's tarweed

Species

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