Equisetum telmateia subsp. braunii
Nova Hedwigia 30: 434. 1978.
Aerial stems dimorphic; vegetative stems green, branched, 30–100 (–200) cm; hollow center 2/3–3/4 stem diam. Sheaths squarish in face view, 7–18 × 5–13 mm; teeth green proximally and dark distally, 14–30 (–36), 3–12 mm. Branches in regular whorls, ascending to spreading, solid; ridges 4–5, furrowed; valleys rounded; 1st internode of each branch shorter than subtending stem sheath; sheath teeth attenuate. Fertile stems brown, lacking stomates, unbranched, shorter (17–45 cm) than vegetative stems, with larger (15–40 mm) sheaths, fleshy, ephemeral.
Habitat: Coastal marshes, stream banks, ditches, and other wet places
Elevation: 0–1000 m
Distribution
B.C., Alaska, Calif., Oreg., Wash.
Discussion
Equisetum telmateia subsp. telmateia, from Europe, northern Africa, and the Middle East, differs primarily in having main aerial stem with white internodes, lacking both green tissue and stomates but having green, whorled branches.
Selected References
None.