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Montana Field Guide

Montana Field Guides

Horsetail (Hybrid) - Equisetum x ferrissii

Native Species

Global Rank: GNA
State Rank: SNA

Agency Status
MNPS Threat Rank:

External Links

General Description
Plants 20-180 cm; stems unbranched, sheaths dark-girdled with age; teeth 14-32 per sheath, articulate and shed or persistent. Cone apex pointed; spores white and misshapen (Hauke, 1993 in Flora N. Amer., Vol. 2).

Species Range

Range Comments
Across much of North America, mostly south of Canada and mostly absent from southeastern US (Haute, 1993, in Flora N. Amer., Vol. 2).

Observations in Montana Natural Heritage Program Database
Number of Observations: 6

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Moist areas including shorelines, riverbanks, roadsides and prairies (Haute, 1993, in Flora N. Amer., Vol. 2).

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Citation for data on this website:
Horsetail (Hybrid) — Equisetum x ferrissii.  Montana Field Guide.  .  Retrieved on , from