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Harperella (Ptilimnium nodosum), also known as Bishop's Weed, is an annual plant from the Carrot family. It grows 6-36 inches (0.15-1 m) in height and has weak-looking stems with hollow, quill- like leaves. This delicate wildflower is aromatic (scented) and smells like Dill herb. It produces flat clusters of small white flowers at the top of the stems and blooms intermittently from May until first frost. This plant is found in rocky or gravelly shoals of clear, swift-flowing streams and along the edges of shallow, intermittently flooded ponds and wet meadows.