Blue/purple Flowers
| Dogbane Family (Apocynaceae) | ||||
 Periwinkle Vinca minor |
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| Aster Family (Asteraceae) | ||||
 Chicory Cichorium intybus |
 Robin-plantain Erigeron pulchellus |
 Large-leaved Aster Eurybia macrophylla |
 Rough-leaved Aster Eurybia radula |
 Showy Aster Eurybia spectabilis |
 Stiff Aster Ionactis linariifolia |
 Bog Aster Oclemena nemoralis |
 Heart-leaved Aster Symphyotrichum cordifolium |
 Bushy Aster Symphyotrichum dumosum |
 Smooth Aster Symphyotrichum laeve |
 Lowrie's Aster Symphyotrichum lowrieanum |
 New England Aster Symphyotrichum novae-angliae |
 New York Aster Symphyotrichum novi-belgii |
 Late Purple Aster Symphyotrichum patens |
 Purple-stemmed Aster Symphyotrichum puniceum |
 Wavy-leaved Aster Symphyotrichum undulatum |
 New York Ironweed Vernonia noveboracensis |
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| Borage Family (Boraginaceae) | ||||
 Wild Comfrey Cynoglossum virginianum |
 Viper's Bugloss Echium vulgare |
 Virginia Waterleaf Hydrophyllum virginianum |
 True Forget-me-not Myosotis scorpioides |
 Blue Scorpion-grass Myosotis stricta |
| Bellflower Family (Campanulaceae) | ||||
 Marsh Bellflower Campanula aparinoides |
 Harebell Campanula rotundifolia |
 Water Lobelia Lobelia dortmanna |
 Indian-tobacco Lobelia inflata |
 Brook Lobelia Lobelia kalmii |
 Great Lobelia Lobelia siphilitica |
 Spiked Lobelia Lobelia spicata |
 Venus's Looking-glass Triodanis perfoliata |
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| Spiderwort Family (Commelinaceae) | ||||
 Asiatic Dayflower Commelina communis |
 Virginia Spiderwort Tradescantia virginiana |
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| Morning glory Family (Convolvulaceae) | ||||
 Common Morning Glory Ipomoea purpurea |
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| Pea Family (Fabaceae) | ||||
 False Indigo Amorpha fruticosa |
 Blue False Indigo Baptisia australis |
 Wild Blue Lupine Lupinus perennis |
 Common Lupine Lupinus polyphyllus |
 Cow Vetch Vicia cracca |
 Slender Vetch Vicia tetrasperma |
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| Gentian Family (Gentianaceae) | ||||
 Fringe-tipped Closed Gentian Gentiana andrewsii |
 Bottle Gentian Gentiana clausa |
 Stiff Gentian Gentianella quinquefolia |
 Greater Fringed Gentian Gentianopsis crinita |
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| Iris Family (Iridaceae) | ||||
 Slender Blueflag Iris prismatica |
 Larger Blueflag Iris versicolor |
 Stout Blue-eyed Grass Sisyrinchium angustifolium |
 Eastern Blue-eyed Grass Sisyrinchium atlanticum |
 Mountain Blue-eyed Grass Sisyrinchium montanum |
| Mint Family (Lamiaceae) | ||||
 Purple Giant Hyssop Agastache scrophulariifolia |
 Bugle Ajuga reptans |
 Hairy Wood-mint Blephilia hirsuta |
 Ground-ivy Glechoma hederacea |
 American Pennyroyal Hedeoma pulegioides |
 Wild Mint Mentha arvensis |
 Selfheal Prunella vulgaris |
 Narrow-leaved Mountain-mint Pycnanthemum tenuifolium |
 Basil Mountain-mint Pycnanthemum ×clinopodioides |
 Lyre-leaved Sage Salvia lyrata |
 Common Skullcap Scutellaria galericulata |
 Hyssop Skullcap Scutellaria integrifolia |
 Mad-dog Skullcap Scutellaria lateriflora |
 Smaller Skullcap Scutellaria parvula |
 Fluxweed Trichostema brachiatum |
 Bluecurls Trichostema dichotomum |
 Narrow-leaved Bluecurls Trichostema setaceum |
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| False pimpernel Family (Linderniaceae) | ||||
 False Pimpernel Lindernia dubia |
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| Broomrape Family (Orobanchaceae) | ||||
 One-flowered Cancer Root Orobanche uniflora |
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| Lopseed Family (Phrymaceae) | ||||
 Winged Monkey Flower Mimulus alatus |
 Monkey Flower Mimulus ringens |
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| Plantain Family (Plantaginaceae) | ||||
 Dwarf Snapdragon Chaenorhinum minus |
 Blue Toadflax Nuttallanthus canadensis |
 Long-sepaled Beardtongue Penstemon calycosus |
 Hairy Beardtongue Penstemon hirsutus |
 American Brooklime Veronica americana |
 Water Speedwell Veronica anagallis-aquatica |
 Corn Speedwell Veronica arvensis |
 Bird's-eye Speedwell Veronica chamaedrys |
 Common Speedwell Veronica officinalis |
 Marsh Speedwell Veronica scutellata |
| Leadwort Family (Plumbaginaceae) | ||||
 Sea Lavender Limonium carolinianum |
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| Phlox Family (Polemoniaceae) | ||||
 Wild Blue Phlox Phlox divaricata |
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| Pickerelweed Family (Pontederiaceae) | ||||
 Pickerelweed Pontederia cordata |
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| Buttercup Family (Ranunculaceae) | ||||
 Round-lobed Hepatica Anemone americana |
 Purple Clematis Clematis occidentalis |
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| Bedstraw Family (Rubiaceae) | ||||
 Bluets Houstonia caerulea |
 Long-leaved Bluet Houstonia longifolia |
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| Nightshade Family (Solanaceae) | ||||
 Horse-nettle Solanum carolinense |
 Nightshade Solanum dulcamara |
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| Vervain Family (Verbenaceae) | ||||
 Blue Vervain Verbena hastata |
 Narrow-leaved Vervain Verbena simplex |
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| Violet Family (Violaceae) | ||||
 Hook-spurred Violet Viola adunca |
 Coast Violet Viola brittoniana |
 Marsh Blue Violet Viola cucullata |
 Dog Violet Viola labradorica |
 Early Blue Violet Viola palmata |
 Birdfoot Violet Viola pedata |
 Long-spurred Violet Viola rostrata |
 Arrow-leaved Violet Viola sagittata |
 Great-spurred Violet Viola selkirkii |
 Common Blue Violet Viola sororia |