Venus fly-trap

Venus fly trap a white-flowered swamp flower of the sundew family, native to the Carolinas, having leaves with two hinged blades that snap shut to trap insects. 

Fig. 30.—Venus fly-traps, Dioncea muscipula, growing in field near Wilmington, N. C, Photograph by Charles Palmer.)...

It is not particularly effective since it can only form two bonds, while iron utilizes six. At the other extreme is ferrachrome, an absolutely beautiful molecule, which is like a Venus Fly Trap with three hydroxamlc acid groups - one in the back of each of three arms. Once iron goes in, it is held in place very tightly by six bonds. Ferrachrome is one of the most effective iron chelators in nature. 

Any plant that supplements its supply of nitrates in conditions of nitrate deficiency by digesting small animals, especially insects. Such plants are adapted in various ways to attract and trap the insects and produce proteolytic enzymes to digest them. Venus fly trap (Dionaea), for example, has spiny-mar-gined hinged leaves that snap shut on an alighting insect. Sundews (Drosera) trap and... 

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