Leonardo da Vinci, Star of Bethlehem (Ornithogalum umbellatum), wood anemone (Anemone nemorosa) and sun spurge (Euphorbia helioscopia), c.1505–10 Pen and ink with red chalk on paper, 19.8 × 16 cm
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Leonardo da Vinci, Studies of Brambles (with details), red chalk and white heightening on prepared paper, c. 1505-10
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Leonardo da Vinci, plant drawings, 1505-1510
