Streptanthus morrisonii is an uncommon species of flowering plant in the mustard family known by the common name Morrison's jewelflower.

In general, it is a biennial herb producing a hairless, waxy stem up to 1.2 to 1.5 meters in maximum height, often branching at the tip.

The basal leaves have fleshy, lance-shaped blades 3 to 5 centimeters long borne on petioles.

Leaves higher on the stem are variable in shape and become smaller toward the top of the plant.

Threats to this species include boron toxicity from the steam of nearby geothermal power plants.