Equisetum sylvaticum L.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Equisetaceae
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Scientific Name
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Description
Species Description - Stems annual, dimorphic, the sterile ones 3–7 dm, 1.5–3 mm thick, mostly 10–18-ridged, each ridge with 2 rows of sharp hooked spinules, the stomates in 2 bands in the furrows, the central cavity larger than the vallecular ones and most more than half the diameter of the stem, the sheaths 1–2 cm, basally green, distally brown, with persistent, irregularly connate brown teeth; branches regularly whorled, solid, 4–5-angled, commonly again branched; the first internode commonly longer than the associated sheath of the main stem; fertile stems subprecocious, at first simple and pale, later producing whorls of green, mostly compound branches and often themselves becoming green; cones long-peduncled, 1.5–3 cm, deciduous, not apiculate. Cool moist woods; circumboreal, in Amer. s. to Md., W.Va., Ky., and Io.
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Common Names
woodland-horsetail