Wilde planten in Nederland en BelgiŽ

Bosogentroost - Euphrasia nemorosa


Deutschlands Flora in Abbildungen, Jacob Sturm und Johann Georg Sturm


Bilder ur Nordens Flora, deel 1, Carl Axel Magnus Lindman (1922-1926)


Journal of botany, British and foreign, deel 36, B. Seemann, R. Morgan (1898)


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

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