Ranunculus ficaria (fig buttercup)

Coprinus ellisii
Coprinus lagopus
Coprinus megaspermus
Coprinus niveus
Coprinus picaceus
Coprinus plicatilis
Coprinus saccharinus
Coptis trifolia (threeleaf goldthread)
Coral Sea Islands
Corallorhiza odontorhiza (autumn coralroot)
Corallorhiza striata (hooded coralroot)
Corallorhiza striata var. striata (hooded coralroot)
Corallorhiza trifida
Corallorhiza trifida (yellow coralroot)
Corallorhiza wisteriana (spring coralroot)
Coreopsis grandiflora (largeflower tickseed)
Coreopsis lanceolata (lanceleaf tickseed)
Coreopsis pubescens (star tickseed)
Coreopsis rosea (pink tickseed)
Coreopsis tinctoria var. tinctoria (golden tickseed)
Coreopsis verticillata (whorled tickseed)
Coriandrum sativum
Corispermum americanum var. rydbergii (American bugseed)
Cornus alba
Cornus amomum (silky dogwood)
Cornus canadensis (bunchberry dogwood)
Cornus drummondii (roughleaf dogwood)
Cornus foemina (stiff dogwood)
Cornus mas

Image of Ranunculus ficaria (fig buttercup) 1
USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 2: 117.