Ranunculus hispidus (bristly buttercup)

Cakile edentula (American searocket)
Calamagrostis canadensis (bluejoint)
Calamagrostis coarctata (arctic reedgrass)
Calamagrostis pickeringii (Pickering's reedgrass)
Calamagrostis porteri (Porter's reedgrass)
Calamagrostis stricta ssp. inexpansa (northern reedgrass)
Calamagrostis stricta ssp. stricta var. stricta (slimstem re
Calamintha menthifolia
Calamovilfa brevipilis (pine barren sandreed)
Calamovilfa longifolia (prairie sandreed)
Calendula officinalis
Calla palustris (water arum)
Callicarpa bodinieri var. giraldii
Callirhoe alcaeoides (light poppymallow)
Callisia graminea (grassleaf roseling)
Callitriche hermaphroditica (northern water-starwort)
Callitriche heterophylla (twoheaded water-starwort)
Callitriche palustris (vernal water-starwort)
Callitriche terrestris (terrestrial water-starwort)
Calluna vulgaris
Calochortus gunnisonii (Gunnison's mariposa lily)
Calochortus nuttallii (sego lily)
Caltha natans (floating marsh marigold)
Caltha palustris
Calylophus serrulatus (yellow sundrops)
Calypso bulbosa var. americana (fairy slipper)
Calystegia sepium
Calystegia sepium ssp. angulata (hedge false bindweed)
Calystegia sepium ssp. sepium (hedge false bindweed)

Image of Ranunculus hispidus (bristly 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: 113.