One of the mysteries of the English language finally explained.
1Any of various plants having straight, slender, especially hollow or unbranched stems, especially field horsetail (Equisetum arvense), and (US) (more fully "Indian pipeweed") a North American desert plant having erect leafless stems which are swollen near the top, Eriogonum inflatum (family Polygonaceae).
2Pipe tobacco; (also) the prepared leaves of any plant used as a substance to be smoked in a pipe.
Early 18th century (in an earlier sense). From pipe + weed.
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