Heart-Leaved Alexanders (Zizia aptera)
Apiaceae or Celery Family

Small erect plant, with tiny, yellow, 5-petalled flowers in dense, flat-topped clusters.  Two kinds of leaves; upper leaves divided into 3-5 toothed, egg-shaped leaflets, while basal leaves are heart-shaped.  Blooms in mid spring in open woods and on woodland edges. 

Very common on western slope of the Park, especially near the Grand Staircase.

Golden Alexanders (Z. aurea) is very similar, but the basal leaves are divided into muliple leafleats instead of being heart-shaped. Yellow pimpernel blooms in the same area about the same time.  It has flowers in much more open clusters, untoothed leaflets, and no heart-shaped leaves.