Gratiola heterosepala is a species of flowering plant known by the common name Boggs Lake hedgehyssop.

It is native to northern California, where it grows in mud and very shallow water, such as the edges of vernal pools.

[1] Gratiola heterosepala is a small annual herb with reddish-green stems, a few centimeters tall.

The top of the stem is occupied by an inflorescence that produces centimeter long tubular flowers.

[2] The plant is threatened by grazing, development, agriculture, recreational activities, and vernal pool loss.