North America Native Plant

Sullivan City Flax

Botanical name: Linum lundellii

USDA symbol: LILU

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Sullivan City Flax: A Rare Texas Treasure Worth Protecting Meet Sullivan City flax (Linum lundellii), one of Texas’s most elusive botanical gems. This little-known annual wildflower might not be destined for your garden beds, but its story is worth telling – and its conservation status makes it a plant that ...

Rare plant alert!

Region: Conservation status by state

Status: S3: Status is uncertain but is somewhere between the following rankings: 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 ⚘

Sullivan City Flax: A Rare Texas Treasure Worth Protecting

Meet Sullivan City flax (Linum lundellii), one of Texas’s most elusive botanical gems. This little-known annual wildflower might not be destined for your garden beds, but its story is worth telling – and its conservation status makes it a plant that deserves our attention and respect.

What Makes Sullivan City Flax Special?

Sullivan City flax is a native annual forb, meaning it’s an herbaceous plant that completes its entire life cycle in just one growing season. Like other members of the flax family, it lacks woody stems and produces delicate flowers that add subtle beauty to its natural habitat.

This Texas native is found exclusively in the Lone Star State, making it a true endemic species. However, don’t start planning your garden around this charming wildflower just yet – there’s an important conservation story here that every gardener should know.

A Plant in Need of Protection

Here’s where things get serious: Sullivan City flax has a Global Conservation Status of S3, which translates to Vulnerable. This designation means the species is at risk due to its extremely limited range and small population size. Scientists estimate there are only 21 to 100 known occurrences of this plant, with somewhere between 3,000 and 10,000 individual plants in existence.

These numbers might sound reasonable, but in the plant world, they’re actually quite concerning. This rarity makes Sullivan City flax unsuitable for typical garden cultivation, and responsible gardeners should avoid attempting to grow it unless they have access to ethically sourced, nursery-propagated material – which is extremely unlikely to be available.

Why You Shouldn’t Plant Sullivan City Flax (And What to Plant Instead)

While we always encourage native plant gardening, Sullivan City flax falls into a special category. Here’s why you should admire it from afar:

  • Its vulnerable status means wild collection could harm remaining populations
  • Commercial availability is essentially non-existent
  • Its specific habitat requirements are not well understood
  • Conservation efforts should focus on protecting existing populations

Better Flax Options for Texas Gardens

If you’re drawn to the delicate beauty of native flax species, consider these more common and garden-appropriate alternatives for Texas landscapes:

  • Yellow flax (Linum rigidum) – a more widespread Texas native
  • Blue flax (Linum lewisii) – though more common in western regions
  • Grooved flax (Linum sulcatum) – another native option where available

These alternatives can provide similar aesthetic appeal while supporting pollinators and maintaining ecological integrity without putting rare species at risk.

Supporting Conservation

The best way to help Sullivan City flax is to support habitat conservation in South Texas and contribute to organizations working to protect rare native plants. By choosing more common native species for our gardens, we reduce pressure on vulnerable plants while still creating wildlife-friendly landscapes.

Sometimes the most responsible choice for native plant enthusiasts is knowing when not to plant something – and Sullivan City flax is a perfect example of a species that’s better loved from a distance.

The Bigger Picture

Sullivan City flax reminds us that native plant gardening isn’t just about what we can grow in our own yards. It’s about understanding our role in a larger ecosystem and making choices that support biodiversity and conservation. While you won’t find this rare beauty in your local nursery (and shouldn’t look for it in the wild), its existence enriches Texas’s natural heritage.

Every time you choose a common native plant over a rare one, or a native species over a non-native alternative, you’re making a small but meaningful contribution to conservation. And that’s something every gardener can feel good about.

Sullivan City Flax

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

Linales

Family

Linaceae DC. ex Perleb - Flax family

Genus

Linum L. - flax

Species

Linum lundellii C.M. Rogers - Sullivan City flax

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