Sisymbrium linifolium, commonly known as flaxleaf plainsmustard or skeleton mustard, is a perennial herb native to a variety of habitats in western North America. These habitats include salt-desert shrublands, sagebrush steppes, pinyon-juniper woodlands, and montane regions with Ponderosa pine and trembling aspen. It is found from British Columbia east of the Cascade Range to Saskatchewan in Canada, and south to Arizona and New Mexico in the United States. The plant typically grows up to 20 inches tall with erect, slender stems emerging from a deep rhizome system.

Flaxleaf plainsmustard is recognized for its fine-textured, linear leaves that resemble flax, hence the common name. It produces small, inconspicuous yellow flowers that bloom in the warmer months. While not known for showy blooms, it can be used in native plant gardens or restoration projects where its ability to adapt to various soil types and conditions is beneficial. It requires minimal water once established, making it suitable for xeriscaping. However, gardeners should be cautious as Sisymbrium linifolium can become invasive outside its native range, so it is essential to check local regulations before planting.CC BY-SA 4.0