Roadside Plants, N. Am. Natives in Red
I passed by the flowers for years, not knowing what many of them were called.  Note that some are native, many are not, and a few are seriously invasive.

Plantain
White Clover
Field Clover
Crimson Clover
Cherokee Rose
Blue Eyed Grass
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Dewberries
Lady Lupine
Chickasaw Plum
Lyre Leaf Sage
Wisteria
Sourdock (Sorrel)
Wild Radish
Verbena
Fleabane
Mexican Evening Primrose
Corn Salad
Slender Vervain
Coreopsis
Phlox drummondi
Pineland Indigo
Amsonia
Helianthemum
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Rain Lily
Elderberry
Peppergrass
Maple
Bradford Pear
Carolina Jessamine
Bluets
Oxalis
Crow Poison
St. John's Wort
Privet
Mikania
Primrose Willow
Blanketflower
Scrub Pawpaw
Sandhill Milkweed
Prickly Pear
Rudbeckia
Brazilian Vervain
Orange Milkweed
Mimosa
Beardtongue
Cyperus
Buttonbush
Cattail
Gopher Apple
Hibiscus
Yucca
Titi
Redroot
Sedge
Rosy Camphorweed
Stinging Nettle
Potato Vine
Morning Glory
Palo Verde
Ironweed
Chrysopsis
Trumpet Vine
Sabatia
Lantana
Chinese Tallow
Abelia
Wild Buckwheat
Pickeralweed
Rhexia
Sida
Cypress Vine
Scarlet Creeper
Coffeeweed
Sesban
Golden Rain Tree
Soft Greeneyes
St. John's Wort
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Narrowleaf Silkgrass
Dog Fennel
Yellow Bidens
White Bidens
Rattlebox
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Goldenrod
Flattop Goldenrod
Swamp Sunflower
Sugarcane Plumegrass
Mistflower
Morning Glory
Ivy Leaf Morning Glory
Ageratum
Bluecurls
Ageratum
Seminole False Foxglove
False Foxglove
Wedelia
Wedelia
Eupatorium
Ageratum
Unidentified
Groundsel
Muhly Grass
Maryland Golden Aster
Broomsedge
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Liatris
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Coreopsis (unknwn)
Ageratum
Dandelion
Ageratum
Cotton
Ageratum
Pyracantha
Kudzu
Saw Palmetto