Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 40.
Hälsingland, 16/05/1732, ¶122:
It was here that I saw ‘Hepatica’ with purple flowers, very rare elsewhere, and I would like the chance to test the gardeners’ theory that states that the colour of the soil affects the colour of the flower.