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USDA Seed Plates   (JPG files) These 1930's era illustrations are just as useful today.
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Hillman, F. H. and Helen H. Henry.  1935.  Photographs of Drawings of Seeds; The more important forage-plant seeds and incidental seeds commonly found with them.  Division of Seed Investigations, Bureau of Plant Industry, United States Department of Agriculture, Washington D.C.. Revised 1935.

(Scientific name index in progress - thanks for your patience!)
USDA Plate 1   Poaceae
USDA Plate 2   Poaceae
USDA Plate 3   Poaceae
USDA Plate 4   Cyperaceae, Juncaceae, Alliaceae, Urticaceae, Polygonaceae
USDA Plate 5   Polygonaceae, Chenopodiaceae, Amaranthaceae, Caryophyllaceae
USDA Plate 6   Caryophyllaceae, Ranunculaceae, Papaveraceae, Brassicaceae
USDA Plate 7   Brassicaceae
USDA Plate 8   Resedaceae, Rosaceae, Fabaceae
USDA Plate 9   Fabaceae
USDA Plate 10  Fabaceae, Oxalidaceae, Linaceae, Geraniaceae, Euphorbiaceae, Malvaceae, Clusiaceae
USDA Plate 11  Violaceae, Lythraceae, Onagraceae, Apiaceae, Primulaceae, Convolvulaceae, Cuscutaceae, Boraginaceae
USDA Plate 12   Boraginaceae, Verbenaceae, Lamiaceae
USDA Plate 13   Lamiaceae, Solanaceae, Scrophulariaceae, Plantaginaceae, Rubiaceae
USDA Plate 14   Valerianaceae, Dipsacaceae, Campanulaceae, Asteraceae
USDA Plate 15   Asteraceae

USDA Plate Vicia  Comparison of Vicia villosa and Vicia dasycarpa