Wilde planten in Nederland en België

Addisonia, deel 2 (1917)

Flore médicale des Antilles, deel 7, M.E. Descourtilz (1829)

Water-color sketches of American plants, especially New England, Helen Sharp (1888-1910)

Flowers of the field and forest, I. Sprague, A.B. Hervey,(1880)

A guide to wild flowers, A. Lounsberry, E. Rowan (1899)

Das Pflanzenreich, Alismataceae, H.G.A. Engler , deel 15 (1903)