Arboretum at Arizona State University Tempe, Arizona
Phoenix dactylifera (Date Palms) 300 taxa, 40+ varieties

Arnold Arboretum of Harvard University Boston, Massachusetts
Acer (Maples) 133 taxa, 55 species - part of multi-site collection
Carya (Hickories, Pecans) 18 taxa, 11 species
Fagus (Beeches) 26 taxa, 8 species
Stewartia (Stewartias) 11 taxa, 7 species
Syringa (Lilacs) 201 taxa, 22 species
Tsuga (Hemlocks) 59 taxa, 7 species

Atlanta Botanical Garden Atlanta, Georgia
Acer (Maples) 82 taxa - part of multi-site collection
Sarracenia (Pitcher Plants) 78 taxa

Chicago Botanic Garden Glencoe, Illinois
Geranium (Geraniums) 102 taxa including 85 cultivars
Spiraea (Spireas) 52 taxa
Quercus (Oaks) 48 taxa - part of multi-site collection

Cornell Plantations Ithaca, New York
Acer (Maples) 98 taxa - part of multi-site collection
Quercus (Oaks) 77 taxa - part of multi-site collection

Dawes Arboretum Newark, OH
Acer (Maples) 336 taxa - part of multi-site collection

Denver Botanic Gardens Denver, Colorado
Quercus (Oaks) 61 taxa -part of multi-site collection

Fairchild Tropical Botanic Garden Coral Gables, Florida
Arecaceae (Palm Family) 625 taxa, 2006 accessions
Cycadopsida (Cycads) 150 taxa

Fullerton Arboretum (California State University) Fullerton, California
Citrus (Citrus) 36 accessions, 20 taxa

Ganna Walska Lotusland Santa Barbara, California
Cycadopsida (Cycads) 169 taxa, 3 families, 10 genera

Green Spring Gardens Alexandria, Virginia
Hamamelis (Witch Hazels) 35 taxa

Henry Foundation for Botanical Research Gladwyne, Pennsylvania
Magnolia (US Native Magnolias) 15 taxa

Highstead Arboretum Redding, Connecticut
Kalmia (Mountain Laurels) 78 taxa, 3 species, 69 cultivars, 4 forms, 2 hybrids

Holden Arboretum Kirtland, Ohio
Quercus (Oaks) 64 taxa - part of multi-site collection

Hoyt Arboretum Portland, Oregon
Acer (Maples) 67 taxa - part of multi-site collection

Huntington Botanical Gardens San Marino, California
Camellia (Camellias) 40 species, 1200 cultivars

Landis Arboretum Esperance, New York
Quercus of the Northeast U.S. (Oaks) 14 taxa - part of multi-site collection

Mendocino Coast Botanical Gardens Fort Bragg, California
Heaths and Heathers Provisional Status

Montgomery Botanical Center Miami, Florida
Arecaceae (Palm Family) 358 taxa
Cycadales (Cycad Order) 222 taxa

Montreal Botanical Garden/Jardin botanique de Montreal Montreal, Quebec, Canada
Rosa (Roses) 1097 taxa

The Morton Arboretum Lisle, Illinois
Acer (Maples) 67 taxa - part of multi-site collection
Malus (Crabapples) 185 taxa
Quercus (Oaks) 67 taxa - part of multi-site collection
Ulmus (Elms) 73 taxa

Morris Arboretum of the University of Pennsylvania Philadelphia, Pennsylvania
Abies (Firs) 35 taxa, including cultivars
Acer (Maples) 82 taxa - part of multi-site collection
Quercus (Oaks) 58 taxa - part of multi-site collection

Mount Auburn Cemetery Cambridge, Massachusetts
Quercus (Oaks) 25 taxa - part of multi-site collection

Mt. Cuba Center Greenville, Delaware
Hexastylis (Wild Gingers) 39 taxa, including 10 species
Trillium (Trilliums) 84 taxa

New York Botanical Garden Bronx, New York
Acer (Maples) 114 taxa - part of multi-site collection
Quercus (Oaks) 46 taxa - part of multi-site collection

Norfolk Botanical Garden Norfolk, Virginia
Camellia (Camellias) 525 taxa
Hydrangaceae (Hydrangea Family) 190 taxa

North Carolina Arboretum Asheville, North Carolina
Rhododendron (US Native Deciduous Azaleas) 16 species

Polly Hill Arboretum Martha's Vineyard, Massachusetts
Stewartia (Stewartias) 19 taxa

Quarryhill Botanical Garden Glen Ellen, California
Acer (Maples) 48 taxa - part of multi-site collection

Rancho Santa Ana Botanic Garden Claremont, California
Quercus (Oaks) 27 taxa - part of multi-site collection

Rhododendron Species Botanical Garden Federal Way, Washington
Rhododendron subsect. fortunea (Rhododendrons) 300 accessions, 24 taxa including 8 cultivars

San Francisco Botanical Garden at Strybing Arboretum San Francisco, California
Mesoamerican Cloud Forest 331 species in 182 genera representing 83 families, primarily from tropical mountains of southern Mexico and Central America

Santa Barbara Botanical Garden Santa Barbara, California
Dudleya (Dudleyas) 52 taxa

Scott Arboretum of Swarthmore College Swarthmore, Pennsylvania
Ilex (Hollies) 312 taxa
Magnolia (Magnolias) 138 taxa
Quercus (Oaks) 52 taxa - part of multi-site collection

Toledo Botanical Garden Toledo, Ohio
Hosta (Hostas) 2500 accessions, 43 species, 357 cultivars

Tyler Arboretum Media, Pennsylvania
Rhododendron (Rhododendrons) 529 taxa

UC Davis Arboretum Davis, California
Quercus (Oaks) 71 taxa - part of multi-site collection

University of British Columbia Botanical Garden Vancouver, British Columbia, Canada
Acer (Maples) 116 taxa - part of multi-site collection

Univ of California Botanical Garden Berkeley, California
Quercus (Oaks) 71 taxa

US National Arboretum Washington, DC
Buxus (Boxwood) 137 species and cultivars

University of Washington Botanic Gardens Seattle, Washington
Acer (Maples) 209 taxa - part of multi-site collection
Ilex (Hollies) 47 species
Quercus (Oaks) 86 taxa - part of multi-site collection