Hackelia mundula is a species of flowering plant in the borage family known by the common name pink stickseed.

This is a lush, hairy perennial herb growing to maximum heights between 40 and 80 centimeters.

It produces an array of erect stems with oval- or lance-shaped leaves most abundant around the bases, growing up to 22 centimeters long.

The upper stems are mostly leafless and hold cyme inflorescences of flowers.

The fruit is a small nutlet covered in thin, hairlike prickles.