multi-site University of California Botanical Garden at Berkeley Cycads; multi-site Ferns; 360 taxa, with 500+ accessions Magnolia; multi-site Quercus; multi-site Cheekwood Botanical Garden Cornus; 61 taxa Chicago Botanic Garden Geranium; 102 taxa Quercus; 48 taxa Spiraea; 52 taxa Cornell Plantations Acer; multi-site Quercus; multi-site Donald E. Davis Arboretum Quercus; multi-site University of California Davis Arboretum Quercus; multi-site Dawes Arboretum Acer; multi-site Aesculus; 59 taxa Hamamelis; 75 taxa Metasequoia; 9 taxa, with 47 accessions of documented wild-origin, 8 cultivars Denver Botanic Gardens Alpine Plants of the World; 223 taxa Quercus; multi-site Desert Botanical Garden Agavaceae; 346 taxa Cactaceae; 1319 taxa The Arboretum at Flagstaff Penstemon (provisional) - Colorado Plateau, Arizona species; 37 taxa University of Florida- North Florida Research and Education Center Magnolia; multi-site Fort Worth Botanic Garden Begonia; 1001 taxa Fullerton Arboretum (California State University) Citrus; 36 accessions, representing 20 taxa Ganna Walska Lotusland Cycads; multi-site Green Spring Gardens Park Hamamelis; 80 taxa, including all 4 spp Henry Foundation for Botanical Research Magnolia; multi-site Highstead Arboretum Kalmia; 82 taxa, including 3 spp, 76 cultivars, 4 forms, 2 hybrids Holden Arboretum Quercus; multi-site Hoyt Arboretum Acer; multi-site Magnolia; multi-site The Huntington Botanical Gardens Camellia; 1240 taxa, including 40 spp, 1200 cultivars Huntsville Botanical Garden Trillium; 66 taxa, including 28 spp Idaho Botanical Garden Penstemon - Western US (provisional); 33 taxa Jenkins Arboretum Kalmia; 48 taxa Rhododendron; 1861 taxa Jensen-Olson Arboretum Primula; 65 taxa George Landis Arboretum Quercus of the Northeast U.S.; 14 taxa, 9 spp Springs Preserve Mojave Desert Cacti and Succulents; 28 taxa Longwood Gardens Nymphaea; 97 taxa Matthaei Botanical Gardens and Nichols Arboretum Paeonia; 317 taxa, with 467 plants Mendocino Coast Botanical Gardens Heath and Heather; 134 taxa Minnesota Landscape Arboretum Grasses; 184 taxa Pinus; 60 taxa Missouri Botanical Garden Quercus; multi-site Montgomery Botanical Center Arecaceae; 356 taxa Cycads; multi-site Montreal Botanical Garden Rosa; 1097 taxa, including 115 spp Moore Farms Botanical Garden Magnolia; multi-site Morris Arboretum of the University of Pennsylvania Abies; 35 taxa, including cultivars Acer; multi-site Quercus; multi-site Morton Arboretum Acer; multi-site Magnolia; multi-site Malus; 185 taxa, 9 out of 10 known species, plus cultivars Quercus; multi-site Tilia; 45 taxa Ulmus; 78 taxa, 35 spp, 43 hybrids and cultivars Mount Auburn Cemetery Quercus; multi-site Mt. Cuba Center Hexastylis; 39 taxa, including 10 spp Trillium; 84 taxa Naples Botanical Garden Plumeria; 585 taxa New England Wild Flower Society Trillium; 28 taxa New York Botanical Garden Acer; multi-site