Hedysarum alpinum var. americanum Michx. ex Pursh | Smithsonian Institution
Flixweed, herb-Sophia or tansy mustard, Descurainia sophia. Le sisimbre parviflore, Sisymbrium sophia. Copperplate engraving printed in three colours by Pierre Bulliard from his Herbier de la France, ou collection complete des plantes
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The National Museum of Natural History in Paris: one of the largest herbaria in the world