Stanleya viridiflora is a species of flowering plant in the family Brassicaceae known as green princesplume[2] and green-flowered prince's plume.

It is native to the western United States, where it occurs in sagebrush and plateau habitat, often on rocky calcareous, sandstone, clay, shale, or volcanic soils.

It is a perennial herb producing a stout erect stem which may exceed a meter in maximum height.

The leaves have lance-shaped or oblong blades which have smooth or toothed edges or may be divided into a few lobes.

Each flower bud is enclosed in long, thick sepals which open to reveal yellow or whitish petals each measuring up to 2 centimeters in length.