Blue Flax (Linum lewisii) is one of the most ethereally beautiful wildflowers of the American West — a slender, graceful plant whose sky-blue, five-petaled flowers open each morning to catch the early light, then flutter to the ground by afternoon like tiny blue butterflies, only to be replaced by a fresh crop the following dawn. Named by the great botanist Frederick Pursh in honor of Meriwether Lewis, who collected it during the Lewis and Clark Expedition of 1806, this delicate wildflower carries a legacy of exploration woven into its scientific name and remains one of the most beloved symbols of the western landscape.
• Named by Frederick Pursh in honor of Meriwether Lewis, who collected the type specimen during the Lewis and Clark Expedition in 1806
• Each flower opens in the morning and drops its petals by afternoon — a single plant may produce 50 to 100 flowers over its blooming season, but each lasts only one day
• The sky-blue petals are among the purest and most delicate blue colors in the plant kingdom
• The genus name Linum is the ancient Latin name for flax, used for linen production since the Stone Age
• Also called "Prairie Flax" and "Western Blue Flax"
• The species epithet "lewisii" permanently honors Meriwether Lewis's contribution to American botanical exploration
• Found from Alaska and western Canada southward through the western United States to Baja California and northern Mexico
• Extends eastward across the Great Plains to the Great Lakes region and western Ontario
• Most abundant in the Rocky Mountain states, the Intermountain West, and the Great Plains
• Grows in dry prairies, mountain meadows, open woodlands, sagebrush steppe, and alpine ridges
• Found at elevations from 300 to 3,500 m — one of the most elevationally wide-ranging wildflowers in the West
• First described by Pursh in 1818 as Linum lewisii
• The genus Linum contains approximately 180 to 200 species worldwide, distributed on all continents
Roots:
• Woody taproot, deep and branching
Stem:
• Erect, slender, wiry, branched above
• Green, hairless, with a bluish waxy bloom
Leaves:
• Alternate, linear to narrowly lanceolate, 1 to 3 cm long and 1 to 3 mm wide
• Greyish-green, hairless, with a single prominent vein
• Sessile, crowded along the stem
Flower:
• Loose, terminal clusters (cymes) of 5 to 15 flowers
• Each flower 1.5 to 2.5 cm across
• 5 petals, sky-blue to pale blue, delicate and crinkled
• Petals drop by early afternoon — each flower lasts only one morning
• 5 stamens with blue filaments and yellow anthers
• Blooms May through August
Fruit:
• Globe-shaped capsule, 5 to 8 mm in diameter
• 10 compartments, each containing 1 flat, brown seed
• Found in prairies, mountain meadows, sagebrush steppe, open ponderosa pine forests, and alpine ridges
• Prefers full sun and well-drained, dry, gravelly or sandy soils
• Each flower opens in early morning and drops its petals by afternoon — an adaptation that prevents moisture loss during the heat of the day
• Pollinated by small bees, flies, and occasionally butterflies
• The sheer number of flowers produced over the season (50 to 100 per plant) ensures adequate seed set despite the ephemeral nature of each bloom
• Extremely drought-tolerant due to the deep taproot
• Associates with Indian ricegrass, penstemons, and buckwheats in dry western plant communities
• An important component of wildflower seed mixes for prairie restoration
• Provides nectar for native bees and small butterflies
• Sow seeds directly in fall or early spring — requires light for germination, so do not cover deeply
• Best in full sun and well-drained, sandy or gravelly soil
• Very drought-tolerant once established — avoid overwatering
• Tolerates poor, rocky soils and does not require fertilization
• Plants are relatively short-lived (2 to 5 years) but self-seed freely to maintain a population
• Space plants 20 to 30 cm apart
• Excellent for rock gardens, xeric landscapes, meadow plantings, and erosion control on slopes
• The fleeting, one-day flowers create a magical, ever-changing display throughout summer
• Hardy to USDA Zone 3
Anecdote
Blue Flax is inextricably linked to one of the most famous scientific expeditions in American history. On July 1, 1806, near the present-day border of Montana and Idaho, Meriwether Lewis collected a specimen of this plant — a small, blue-flowered wildflower growing on a dry hillside. When the expedition returned, Lewis sent his specimens to the botanist Frederick Pursh, who recognized it as a new species and named it Linum lewisii in Lewis's honor. The pressed specimen that Lewis collected that day still exists in the Academy of Natural Sciences in Philadelphia — over 220 years old, its sky-blue petals faded to a pale brown, but still bearing Lewis's own handwritten label. It remains one of the most historically significant plant specimens in North American botany, a tangible link between the wild flora of the American West and the explorers who first documented it.
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