Equisetum laevigatum

A. Braun

Amer. J. Sci. Arts 46: 87. 1844.

Common names: Smooth scouring rush
Basionym: Equisetum funstonii A.A. Eaton E. kansanum J.H. Schaffner
Treatment appears in FNA Volume 2.

Aerial stems lasting less than a year, occasionally overwintering in the southwestern United States, usually unbranched, 20–150 cm; lines of stomates single; ridges 10–32. Sheaths green, elongate, 7–15 × 3–9 mm; teeth 10–32, articulate and usually shed early, leaving dark rim on sheath. Cone apex rounded to apiculate with blunt tip; spores green, spheric. 2n =216.


Phenology: Cones maturing in spring–early summer.
Habitat: Moist prairies, riverbanks, roadsides
Elevation: 1530–3500 m

Distribution

V2 20-distribution-map.gif

Alta., B.C., Man., Ont., Que., Sask., Ariz., Ark., Calif., Colo., Idaho, Ill., Ind., Iowa, Kans., Mich., Minn., Mo., Mont., Nebr., Nev., N.Mex., N.Dak., Ohio, Okla., Oreg., S.Dak., Tex., Utah, Wash., Wis., Wyo., n Mexico including Baja California

Discussion

Schaffner named this species Equisetum kansanum because he applied the name E. laevigatum to what we now know is the hybrid E. × ferrissii. The coarser-stemmed, occasionally persistent forms in the southwestern United States have been called Equisetum funstonii.

Selected References

None.

Lower Taxa

None.
... more about "Equisetum laevigatum"
Richard L. Hauke +
A. Braun +
Equisetum funstonii +
Smooth scouring rush +
rounded +
0.3 cm3 mm <br />0.003 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Alta. +, B.C. +, Man. +, Ont. +, Que. +, Sask. +, Ariz. +, Ark. +, Calif. +, Colo. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.Mex. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, S.Dak. +, Tex. +, Utah +, Wash. +, Wis. +, Wyo. +  and n Mexico including Baja California +
1530–3500 m +
male +  and unisexual +
smaller than female +
Moist prairies, riverbanks, roadsides +
distinct +
Cones maturing in spring–early summer. +
Amer. J. Sci. Arts +
10 +  and 32 +
elongate +
spheric +
overwintering +  and lasting +
20 cm200 mm <br />0.2 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
in bands +  and scattered +
Equisetum laevigatum +
Equisetum subg. Equisetum +
species +