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Linum sulcatum  Riddell
Riley County, Kansas
Height: 10-32 inches
Family: Linaceae - Flax Family
Flowering Period:   May, June, July
Stems: Erect, branched above middle, rigid, pale green, glabrous, longitudinally grooved.
Leaves: Alternate, simple, sessile, linear to narrowly lanceolate, 1/2 to 1 inch long, less than 1/8 inch wide, glabrous, small glands usually at bases; margins entire; tips sharp-pointed; upper leaves reduced.
Inflorescences: Panicles, terminal.
Flowers: About 1/2 inch wide; sepals 5, lanceolate; margins glandular-toothed; tips pointed; petals 5, less than 1/2 inch long, pale yellow, pubescent inside at bases; stamens 5.
Fruits: Capsules, spherical to egg-shaped, 10-segmented; seeds 1 per segment, small, elliptic, reddish brown.
Habitat: Dry sandy soils of prairies and open woodlands.
Distribution: East 4/5 of Kansas.
Toxicity: All parts of flax can be toxic, but the leaves and seeds are especially so. Sheep are particularly susceptible.
Comments: The petals often last only a day, and even a slight disturbance can sometimes cause them to fall. A single plant will usually produce only 1-2 flowers a day.

Grooved flax inflorescence and sepals
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