Crested Dwarf Iris or Crested Iris 
(Iris cristata) and Vernal Iris ( I. verna)

These two irises are very similar and you may find either one in our wooded areas. 

 The "crest" refers to a raised yellow ridge on the three sepals of the Crested Iris.  Sepals are the segments of the calyx, the outer covering of the flower bud, that remain after the flower blooms.  Generally they're not very noticeable compared with the petals but in these plants it's reversed.  The blue or violet petals are less showy than the sepals.

The sepals of the Vernal Iris look similar with an orange and white blaze but without the raised crest.  Additionally, the leaves of the Vernal Iris are much slimmer almost grass-like, than the Crested.

Provided by:
Glenn P., Arboretum Volunteers
Photo by: Angela B., Arboretum Staff