Equisetum laevigatum A. Braun - Smooth Horsetail


 

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Equisetum laevigatum - (image 1 of 4)

 

Taxonomy

Family: Equisetaceae

 

Synonymous with E. kansanum. As a variety of E. hyemale it would be considered var. intermedium A.A. Eaton.

Habitat

Open wet places.

Associates

 

Distribution

Southern Ontario, western NY, OH, WV, IL, OK, and TX, west from Southern British Columbia to Baja CA.

Morphology

Fertile and sterile stems alike, produced annually, to 1 m, with mostly 16-32 smooth or inconspicuously wrinkled ridges, sometimes fewer, typically unbranched; central cavity more than half the diameter of the stem; sheaths green, 7-15 mm, typically black at the apex only, or with the lower ones sometimes black at the base or throughout; teeth of the sheath dark, scarious-margined, soon deciduous. Strobilis 1-2.5 cm, short-pedunculate, typically blunt or sometimes inconspicuously short-apiculate.

Notes

Strobilli produced in June

Wetland indicator: Facultative Wetland

The stomata of this species occur in two lines in each furrow, whereas those of E. fluviatile occur in a single line. Can hybridize with E. hyemale and E. variegatum.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

 

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 


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 Michael Hough 2010