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Caltha leptosepala
http://www.botany.hawaii.edu/faculty/carr/images/cal_lep.jpg
image
Caltha leptosepala spp. howellii (Marshmarigold)
http://www.cwnp.org/photopgs/cdoc/caleptosepala.html
Image and brief description of this plant.
Caltha palustris
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=CAPA5
Yellow Marsh Marigold.
Caltha palustris - Marsh Marigold
http://www.ces.ncsu.edu/depts/hort/consumer/poison/Calthpa.htm
Image, description, and toxicity.