The Caper Family East of the Cascade Mountains of Oregon and Washington

Hillman's Stinkweed, Hillman's Cleomella: Cleomella hillmanii var. hillmanii (Synonym: Cleomella macbrideana) - Fruits less than 7 mm long, as wide or wider than long. Leaves palmately compound, the leaflets less than 3-4 times longer than wide. Flowers yellow.

Alkali Cleomella, Twisted Cleomella: Cleomella plocasperma - Fruits less than 7 mm long, as wide or wider than long. Leaves palmately compound, the leaflets at least 5 times longer than wide. Flowers yellow.

Yellow Bee Plant: Peritoma lutea (Synonyms: Cleome lutea, Cleome lutea ssp. lutea, Cleome lutea var. lutea) - Fruits longer than 10 mm, much longer than wide. Leaves palmately compound. Plants glabrous to slightly hairy. Sepals up to 3 mm long. Flowers yellow. Fruits elongate and linear.

Golden Bee Plant, Golden Cleome, Golden Spider Flower: Peritoma platycarpa (Synonym: Cleome platycarpa) - Fruits longer than 10 mm, much longer than wide. Leaves palmately compound. Plants glandular. Sepals over 3 mm long. Fruits ovate to oblong.

Rocky Mountain Bee Plant, Rocky Mountain Bee-plant, Guaco Rocky Mountain Bee-plant, Guaco Stink Weed: Peritoma serrulata (Synonym: Cleome serrulata)

Red Whisker Clammyweed: Polanisia dodecandra ssp. dodecandra

Red Whisker Clammyweed, Large-flowered Clammyweed, Western Clammyweed: Polanisia dodecandra ssp. trachysperma (Synonym: Polanisia trachysperma)