Hackelia diffusa is a species of flowering plant in the family Boraginaceae known by the common name spreading stickseed.

[1] The plant grows east of the Cascades in British Columbia, Washington and Oregon.

[2] Its habitats include rocky cliffs, talus slopes, and shrub steppe.

[3] Hackelia diffusa is a perennial herb from 2 to 7 dm tall.

[2] It has an inflorescence of false-racemes with numerous white flowers that have a yellow center.