This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
Family, Mustard. Color, pale yellow. Flowers, small, in close spikes, the lower forming pods, while the upper are still in bud. Leaves, deeply cut into narrow segments, the middle onethe largest, the upper ones sessile, the lower on short petioles. The incised parts often turn backward. Pods, long, pointed, firm and thick, closely lying against the stem. May to November.
Naturalized from Europe, used for the table. In waste places, often a weed, everywhere except far North. 2 to 3 feet high.
 
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