Streptanthus tortuosus is a biennial or short lived perennial plant in the mustard family (Brassicaceae) known by the common names shieldplant,[1] shieldleaf, and mountain jewelflower.

[2] It is native to the mountains of northern and central California, its distribution extending just into Oregon and Nevada in the United States.

In general, it is a biennial or perennial herb growing a few centimeters to over a meter tall.

[2] Flowers occur at intervals along the upper stem, and there is usually a leaflike bract below them.

Each flower has an urn-shaped calyx of sepals in shades of purple or greenish yellow with four petals emerging from the tip.