Mustard

edible as cooked greens.
boil older plants in two changes of water to reduce bitterness.
varieties in Alberta are True mustards (Brassica spp.), Wintercresses (Barbarea spp.), Tansy mustards (Descurainia spp.) and Tumble-mustards (Sisymbrium spp.).
grows in open, disturbed areas in plains, foothills, and montane regions.

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