Peritoma serrulata (Previously Cleome serrulata) 

Rocky Mountain Bee Plant 

• Annual
• Average to Dry Soils
• Full Sun 
• Up to 48” tall, 12” to 18” spacing
• Summer to Early Fall Blooms
• Thrives in Meadow and Dry Meadow Ecosystems and will grow in containers
• Native to North America, from Manitoba west, but not to Ontario

Still new to my gardens grown from seeds sourced from Prairie Moon Nursery.

https://www.prairiemoon.com/cleome-serrulata-rocky-mountain-bee-plant-prairie-moon-nursery.html 

Also known as Spider Flower, this is the wild version of a familiar garden annual that grows to roughly 4' in height and 12" wide.

Please check out the Prairie Moon listing at the link above for more details.

Photos by USFWS Mountain-Prairie, USDI Bureau of Land Management and Andrey Zharkikh via Wikimedia Commons