Bupleurum longifolium

A pleasantly architectural plant with upright stems piercing a succession of single leaves topped with a small constellation of flowers, marked by a star-like collection of sepals in which the several inconspicuous-but-charming flowers lie. The overall effect is very sunny and would go great in a meadow-esque setting with fellow Apiaceae members or the like. Not to mention this is one cool customer, hardy down to -35 Fahrenheit, making it cold tolerant anywhere in the continental US!