Calla, Wild
Canada Thistle
Cardinal Flower
Carpetweed
Catchfly, Sleepy
Catnip
Cattail, Common
Cedar, Ground
Celandine 
Celandine Poppy (F)
Chamomile, Wild
Cherry, Choke
Cherry, Pin or Bird
Chicory
Chickweed, Common
Chickweed, Mouse-ear
Cinquefoil, Common
Cinquefoil, Rough-fruited
Cinquefoil, Silvery
Cinquefoil, Shrubby
Cleavers
Clintonia
Clover, Alsike
Clover, Hop
Clover, Least Hop
Clover, Red
Clover, White
Clover, White Sweet
Clover, Yellow Sweet
Club-moss, Wolf's Claw 
Cohosh, Black (F)
Cohosh, Blue (F)
Coltsfoot
Columbine, Wild
Compass-plant
Cuckoo-flower
Corydalis, Golden (F)
Corydalis, Pale
Crabapple, Common
Cranesbill, Bicknell's
Cranberry, Highbush
Cress, Bitter
Crowfoot, Hooked
Crowfoot, Small-flowered
Cucumber, Wild 
Culver's Root
Cup Plant (F)
Daisy, Oxeye
Dames Rocket
Dandelion, Common
Deptford Pink
Dewberry
Dock, Curled
Dogbane, Clasping-leaved
Dogbane, Spreading
Dogtooth Violet
Dogwood, Panicled
Dogwood, Red-osier
Dogwood, Round-leaved
Dragonhead, American
Dutchman's Breeches
Elder, Common
Elder, Red-berried
Enchanter's Nightshade
Feverfew (F)
Fireweed
Flax, Garden (F)
Fleabane, Daisy
Fleabane, Philadelphia
Ferns
– Bracken fern
– Cinnamon fern
– Common polypody fern
– Interrupted fern
– Lady fern
– Maidenhair fern
– Marginal wood fern
– Marsh fern
– Ostrich fern
– Royal fern
– Sensitive fern
Foamflower
Four-o'clock, Wild
Forget-me-not, Smaller
Forget-me-not, True
Fragrant Water Lily
Frogbit, European
Galinsoga
Gentian, Closed
Gill-over-the-ground 
Ginger, Wild (F)
Goatsbeard, Yellow
Goldenrod, Blue-stemmed
Goldenrod, Canada
Goldenrod, Early
Goldenrod, Lance-leaved
Goldenrod, Rough-stemmed
Goldenrod, Tall 
Goldenrod, Zigzag
Goldthread 
Gooseberry, Prickly 
Goosefoot, Maple-leaved
Grape, Riverbank
Grasses & Sedges
– Awl-fruited sedge 
– Bladder sedge
– Common reed
– Common rush
– Crawford's sedge 
– Fox sedge 
– Fringed sedge
– Hop sedge 
– Porcupine sedge
– Wool grass sedge
Gromwell, Corn
Ground-cherry, Clammy
Ground-cherry, White