Gentianella quinquefolia 

Stiff Gentian

• Annual, Biennial or Short-lived Perennial
• Average to slightly wet or slightly dry soils
• Full sun to partial shade
• 24” tall, 12” to 24” wide
• Lat summer to fall blooms
• Native to Ontario, Short lived, Suited to meadow ecosystems

New to me this year, grown from seeds from Prairie Moon Nursery https://www.prairiemoon.com/gentianella-quinquefolia-stiff-gentian-prairie-moon-nursery.html 

A very showy and late-blooming food source for bumblebees preparing for hibernation. Short lived but known to reseed if they like their growing conditions.

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

Photos by Masebrock and Joshua Mayer via Wikimedia Commons