Wild lupine, Lupinus perennis
 
Wild lupine is an iconic part of the black oak savanna ecosystem and a host plant for many butterflies, including the extirpated Karner blue butterfly.
 
Ecology:
The beautiful light blue pea-shaped flowers bloom early and therefore support the establishment of the yearly new to begin bumble bee colonies. Sundial lupines provide excellent pollen but no nectar and, therefore, don't support butterflies. You can observe a wide variety of bees that can access its pollen.
 
Wild lupine is a host plant for the painted lady, some sulphur and some duskywing butterflies.
 
Growing conditions:
In the wild, sundial lupines grow in open, lightly wooded areas like oak savannas, pine barren and sand prairies. These ecosystems have dry, very poor, and mostly acidic soil. 
In the garden, sundial lupins need full sun, very good drainage and average to dry sandy, gravely or loamy soil.
 
Good to know:
Sundial lupins have only 7 to 11 leaflets. There is a lot of confusion in the nursery trade since there is also a wild lupine that is native to western Canada. Besides wild lupine, it is also called bigleaf lupine, Lupinus polyphyllus Lindl. You can determine this species because it has 11 to 17 leaflets and is overall bigger.