Hackelia amethystina is a species of flowering plant in the borage family known by the common name amethyst stickseed. It is endemic to northern California, where it is found in meadows and forests in the North Coast Ranges and Sierra Nevada. It is a densely hairy perennial herb 40 to 80 centimeters tall. The leaves around the base of the stem may be up to 30 centimeters long and there are generally several smaller leaves along the stem. The inflorescence is an array of coils of flowers. Each flower is just over a centimeter wide with blue to pinkish lobes with white appendages at the bases. The fruit is a cluster of prickly nutlets.