Iris versicolor

Iris versicolor

Blue Flag, Harlequin Blueflag, Larger Blueflag, Northern Blue Flag

Iris pseudacorus

Iris pseudacorus

Pale Yellow Iris, Yellow Flag

Iris foetidissima

Iris foetidissima

Gladdon, Gladwin Iris, Roast Beef Plant, Stinking Iris

Iris crocea

Iris crocea

German Iris, Golden Flag

Iris magnifica

Iris magnifica f. caerulea

var. f. caerulea

Blue Juno Iris

Iris bloudowii

Iris bloudowii

Yellow Mongolian Iris

Iris magnifica

Iris magnifica

Juno Iris

Iris sibirica

Iris sibirica

Siberian Iris

Clerodendrum trichotomum

Clerodendrum trichotomum

Glory Bower, Harlequin Glorybower

Abies balsamea

Abies balsamea 'Improved' New Hampshire Blue

'Improved' New Hampshire Blue

Blundell Blue Balsam Fir, New Hampshire Blue

Eucalyptus globulus

Eucalyptus globulus

Blue Gum, Tasmanian Bluegum

Sabal minor

Sabal minor

Dwarf Palmetto

Baptisia australis

Baptisia australis

Blue False Indigo, Blue Wild Indigo, Horse Fly Weed, Indigo Weed, Rattlebush, Rattleweed

Brahea armata

Brahea armata

Blue Fan Palm, Blue Hesper Palm, Mexican blue palm, Palma Blanca, Sweet Brahea

Ipomoea tricolor

Ipomoea tricolor Heavenly Blue

'Heavenly Blue'

Heavenly Blue Morning Glory

Lobelia siphilitica

Lobelia siphilitica

Blue Cardinal Flower, Great Blue Lobelia

Ageratum houstonianum

Ageratum houstonianum dwarf Blue Mink

'Blue Mink'

Flossflower, Garden Ageratum

Centaurea montana

Centaurea montana Mountain Blue

'Mountain Blue'

Mountain Bluet, Perennial Cornflower

Crataegus brachyacantha

Crataegus brachyacantha

Blue Haw, Blue Hawthorn, Blueberry Hawthorn

Hosta ventricosa

Hosta ventricosa

Blue Hosta, Blue Plantain Lily, Hosta

Liriope muscari

Liriope muscari db

Big Blue Lilyturf, Lilyturf

Lupinus polyphyllus

Lupinus polyphyllus

Big-leaved Lupine, Bigleaf Lupine, Blue Bonnet, Blue-pod Lupine, Bog Lupine, Common Lupine , Garden Lupine, Large-leaved Lupine, Lupin, Meadow Lupine

Picea pungens

Picea pungens Glauca NM Carson

var. glauca NM Carson

Blue Spruce, Colorado Blue Spruce

Verbena hastata

Verbena hastata

American Vervain, Blue Vervain, False Vervain, Indian Hyssop, Swamp Verbena, Swamp Vervain, Vervain, Wild Hyssop

Viola sororia

Viola sororia

Butterfly Violet, Common Blue Violet

Aconitum napellus

Aconitum napellus

Monk's Hood, Monk's-hood , Venus' Chariot

Aquilegia caerulea

Aquilegia caerulea

Colorado Blue Columbine, Colorado Columbine, Rocky Mountain Columbine

Carpinus caroliniana

Carpinus caroliniana

American Hornbeam, Blue Beech, Hornbeam, Ironwood, Muscle-beech, Musclewood, Smooth-barked Ironwood, Water Beech

Cichorium intybus

Cichorium intybus

Chicory

Eryngium planum

Eryngium planum

Blue Eryngo, Flat Sea Holly, Flat-leaved Eryngium

Festuca ovina

Festuca ovina glauca

var. glauca

Blue Fescue

Jacaranda mimosifolia

Jacaranda mimosifolia

Black Poui, Blue Jacaranda, Green Ebony Tree, Jacaranda, The Fern Tree

Knautia arvensis

Knautia arvensis

Blue Buttons, Field Scabiosa, Field Scabious

Lobelia siphilitica

Lobelia siphilitica Alba

var. Alba

Great White Blue Lobelia, White Cardinal Flower, White Lobelia

Picea pungens

Picea pungens Glauca AZ Kaibab

var. glauca AZ Kaibab

Blue Spruce

Picea pungens

Picea pungens Glauca CO Rio Grande

var. glauca CO Rio Grande

Blue Spruce

Picea pungens

Picea pungens Glauca CO San Isabel

var. glauca CO San Isabel

Blue Spruce

Picea pungens

Picea pungens Glauca CO San Juan

var. glauca CO San Juan

Blue Spruce

Picea pungens

Picea pungens var. Glauca NM Santa Fe

var. glauca NM Santa Fe

Blue Spruce

Poa palustris

Poa palustris

Fowl Bluegrass, Swamp Meadow-grass

Poa pratensis

Poa pratensis

Kentucky Blue-grass , Kentucky Bluegrass, Smooth Meadow-Grass

Solanum dulcamara

Solanum dulcamara

Bittersweet Nightshade, Climbing Nightshade, Deadly Nightshade, Nightshade