Flora of North America species comparison

green proximally, black distally, elliptic in face view, 1–2.5 × 0.75–1.5 mm;

teeth 3, dark with white margins, not articulate to sheath.

persisting more than a year, unbranched, tortuous, 2.5–28 cm;

lines of stomates single;

ridges 6.

persisting for 1 year or less, with stomates on surfaces scattered or in bands on each side of valleys.

in regular whorls, except for unbranched forms of Equisetum fluviatile and E. palustre and brown fertile stems of dimorphic species.

apex pointed;

spores green, spheric.

rounded at apex.

=216.