Linum strictum, commonly known as rigid flax, upright flax, and upright yellow flax, is a species of flax with a rigid stem, from whence it derives its taxonomic name, growing to a height of 10–45 cm. The plant is endemic to the Mediterranean region, as well as native to Sudan, Ethiopia, Eritrea, Croatia, Bosnia and Herzegovina, Montenegro, Crimea, Albania, Portugal, Jordan, Iraq, Iran, Madeira, the Canary Islands, the Transcaucasus, Saudi Arabia (Asir), Bahrain, Qatar, Pakistan, and northwest India. It features highly in classical Hebrew and Greek literature, owing principally to its cultivation for its plant fiber, linen, but also for its edible seeds and culinary foliage.