Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 45.
Medelpad, 18/05/1732, ¶152:
As I was not travelling anywhere that day, I went out to enjoy the beauties of the flora, though it was not yet very far advanced. I found ‘Viola aquat. flore albo’ [Moss Violet]. I have only seen a dried specimen before. It is very like the large ‘sylvestris’ [Marsh Violet] and I could easily have believed it was a variation of it had it not been standing immediately alongside one. It always grows by water, the odd or upper petal always shades over into blue, the other side petals are always whitish or mainly white. Apart from the above, I also found the ‘Viola acjuat’. with small purplish flowers, which is noteworthy.