Alabama (AL) Camelia (Camellia japonica) Longleaf Pine (Pinus palustris)
Alaska (AK) Forget-Me-Not (Myosotis alpestris) Sitka Spruce (Picea sitchensis)
Arizona (AZ) Saguaro Cactus Blossom (Carnegia gigantea) Yellow Palo Verde (Parkinsonia microphyllum)
Arkansas (AR) Apple Blossom (Pyrus coronaria) Loblolly Pine (Pinus taeda)
California (CA) California Poppy (Eschscholzia californica) Coast Redwood (Sequoia sempervirens)
Colorado (CO) Rocky Mountain Columbine (Aquilegia caerulea) Blue Spruce (Picea pungens)
Connecticut (CT) Mountain Laurel (Kalmia latifolia) White Oak (Quercus alba)
Delaware (DE) Peach Blossom (Prunus persica) American Holly (Ilex opaca)
Florida (FL) Orange Blossom (Citrus sinensis) Cabbage Palmetto (Sabal palmetto)
Georgia (GA) Cherokee Rose (Rosa laevigata) Live Oak (Quercus virginiana)
Hawaii (HI) Pua Aloalo (Hibiscus brackenridgei) Candlenut Tree (Aleurites moluccana)
Idaho (ID) Syringa Mock Orange (Philadelphus lewisii) Western White Pine (Pinus monticola)
Illinois (IL) Purple Violet (genus Viola) White Oak (Quercus alba)
Indiana (IN) Peony (Paeonia lactiflora) Tulip Poplar (Liriodendron tulipifera)
Iowa (IA) Wild Prairie Rose (Rosa arkansana) Oak (genus Quercus)
Kansas (KS) Sunflower (Helianthus annuus) Eastern Cottonwood (Populus deltoides)
Kentucky (KY) Goldenrod (Solidago altissima) Tulip Poplar (Liriodendron tulipifera)
Louisiana (LA) Southern Magnolia (Magnolia grandiflora) Bald Cypress (Taxodium distichum)
Maine (ME) Eastern White Pine Tassel and Cone (Pinus strobus) Eastern White Pine (Pinus strobus)
Maryland (MD) Black-eyed Susan (Rudbeckia hirta) White Oak (Quercus alba)
Massachusetts (MA) Mayflower (Epigaea repens) American Elm (Ulmus americana)
Michigan (MI) Apple Blossom ( Pyrus coronaria ) Eastern White Pine (Pinus strobus)
Minnesota (MN) Pink and White Ladyslipper (Cypripedium reginae) Red Pine (Pinus resinosa)
Mississippi (MS) Southern Magnolia (Magnolia grandiflora) Southern Magnolia (Magnolia grandiflora)
Missouri (MO) Hawthorn (genus Crataegus) Flowering dogwood (Cornus florida)
Montana (MT) Bitterroot (Lewisia rediviva) Ponderosa Pine (Pinus ponderosa)
Nebraska (NE) Goldenrod (Solidago gigantea) Eastern Cottonwood (Populus deltoides)
Nevada (NV) Sagebrush (Artemisia tridentata) Singleleaf Pinyon Pine (Pinus monophylla)
New Hampshire (NH) Purple Lilac (Syringa vulgaris) Paper Birch (Betula papyrifera)
New Jersey (NJ) Violet (Viola sororia) Northern Red Oak (Quercus rubra)
New Mexico (NM) Yucca (Yucca glauca) Pinyon pine (Pinus edulis)
New York (NY) Rose (genus Rosa) Sugar Maple (Acer saccharum)
North Carolina (NC) Flowering dogwood (Cornus florida) Longleaf Pine ( Pinus palustris )
North Dakota (ND) Wild Prairie Rose (Rosa arkansana) American Elm (Ulmus americana)
Ohio (OH) Scarlet Carnation (Dianthus caryophyllus) Ohio Buckeye (Aesculus glabra)
Oklahoma (OK) Mistletoe (Phoradendron leucarpum) Eastern Redbud (Cercis canadensis)
Oregon (OR) Oregon Grape (Berberis aquifolium) Douglas-fir (Pseudotsuga menziesii)
Pennsylvania (PA) Mountain Laurel (Kalmia latifolia) Eastern Hemlock (Tsuga canadensis)
Rhode Island (RI) Violet (Viola sororia) Red Maple (Acer rubrum)
South Carolina (SC) Yellow Jessamine (Gelsemium sempervirens) Cabbage Palmetto (Sabal palmetto)
South Dakota (SD) American Pasque Flower (Anemone patens var. multifida) Black Hills Spruce (Picea glauca)
Tennessee (TN) Iris (Iris germanica) Tulip Poplar (Liriodendron tulipifera)
Texas (TX) Texas Bluebonnet (genus Lupinus) Pecan (Carya illinoinensis)
Utah (UT) Sego Lily (genus Calochortus) Blue Spruce (Picea pungens)
Vermont (VT) Red Clover (Trifolium pratense) Sugar Maple (Acer saccharum)
Virginia (VA) Flowering dogwood (Cornus florida) Flowering dogwood (Cornus florida)
Washington (WA) Coast Rhododendron (Rhododendron macrophyllum) Western Hemlock (Tsuga heterophylla)
West Virginia (WV) Rhododendron (Rhododendron maximum) Sugar Maple (Acer saccharum)
Wisconsin (WI) Violet (Viola sororia) Sugar Maple (Acer saccharum)
Wyoming (WY) Indian Paintbrush (Castilleja linariifolia) Plains cottonwood (Populus deltoides subsp. monilifera)
I notice that your listing doesn’t include DC (the District of Columbia). While technically not a state, the US Arboretum includes their Tree: scarlet oak [Quercus coccinea] and Flower American Beauty rose [Rosa ‘American Beauty’] on their page:
http://www.usna.usda.gov/Gardens/collections/statetreeflower.html
Being a resident of the Federal city, I like to see it’s inclusion. 😉