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US National Arboretum
Permanent reference collection of over 800,000 specimens of dried pressed plants for scientific studies in agriculture, horticulture, botany, medicine, and other related fields. Contains plants from around the world, with a special emphasis on cultivated plants. Especially well represented groups include azaleas, cherries , daffodils, daylilies, hollies, oaks, viburnums, and willows.