Equisetum ×nelsonii

(A. A. Eaton) J. H. Schaffner

Amer. Fern J. 16: 46. 1926.

Basionym: Equisetum variegatum var. nelsonii A.A. Eaton Fern Bull. 12: 41. 1904
Treatment appears in FNA Volume 2. Treatment on page 84.

Aerial stems persisting less than a year or only the proximal part overwintering, unbranched, 20–60 cm; lines of stomates single; ridges 6–14. Sheaths green, elongate, 3.5–7.5 × 2–4 mm; teeth 6–14, centers brown and margins white, prominent, tip usually brown, long, filiform. Cone apex pointed; spores white, misshapen.

Phenology: Cones maturing in early summer, but spores not shed.
Habitat: Lakeshores, riverbanks.


V2 45-distribution-map.gif

Ont., Que., Ill., Ind., Mich., Minn., Mont., N.Y., Oreg., Wis., Wyo.


Equisetum × nelsonii, the hybrid between E. laevigatum and E. variegatum, is often mistaken for small forms of E. × ferrissii.

Selected References


Lower Taxa

... more about "Equisetum ×nelsonii"
Richard L. Hauke +
(A. A. Eaton) J. H. Schaffner +
Equisetum variegatum var. nelsonii +
Ont. +, Que. +, Ill. +, Ind. +, Mich. +, Minn. +, Mont. +, N.Y. +, Oreg. +, Wis. +  and Wyo. +
Lakeshores, riverbanks. +
Cones maturing in early summer, but spores not shed. +
Amer. Fern J. +
Equisetum ×nelsonii +
Equisetum subg. Equisetum +
species +