Star of Bethlehem (Ornithogalum umbellatum), wood anemone (Anemone nemorosa) and sun spurge (Euphorbia helioscopia)

Leonardo da Vinci; 7 51/64 in.x 6 19/64 in.; pen, ink and red chalk on paper

Euphorbia ejusque historia naturalis et medica ...

Also published in Linné's Amoenitates academicae, v. 3, ed. 1, 1756; ed. 2, 1764; ed. 3, 1787, p. 100-131. cf. Hulth, Bibl. Linn. (1907) p. 85.