Larkspur (Delphinium sp.), death camas (Zigadenus elegans), and wild lupine (Lupinus sp.) are found here and nowhere else in the prairies.    From Wordnik.com.  [Northern mixed grasslands] Reference

A Zigadenus flower.    From Wordnik.com.  [Baby Chatterbox] Reference

We find in wet and boggy situations Saggitaria, Aletris, Tofieldia, Zigadenus, Lachnanthes, Pleea, Xyris, and the very rare spoon-flower, Xanthosma saggitifolia, Schott.    From Wordnik.com.  [North Carolina and its Resources.] Reference