"Leaf of Sundew (Droscra rotundifolia)." — The Encyclopedia Britannica, 1893
"Leaf of Sundew, enlarged, with the tentacles on one side infected over a bit of meat placed on the…
"Glands of Sundew magnified. External aspect with drop of secretion." — The Encyclopedia Britannica,…
"Glands of Sundew magnified. Internal structure." — The Encyclopedia Britannica, 1893