Stock Photo: Purple and yellow pansy or three-colored violet, Viola tricolor. Handcolored copperplate engraving from a botanical illustration by James Sowerby from William Woodville and Sir William Jackson Hooker's "Medical Botany" 1832. The tireless Sowerby (1757-1822) drew over 2,500 plants for Smith's mammoth "English Botany" (1790-1814) and 440 mushrooms for "Coloured Figures of English Fungi " (1797) among many other works.