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.

Distribution

V2 45-distribution-map.gif

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

Discussion

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

Selected References

None.

Lower Taxa

None.
... more about "Equisetum ×nelsonii"
Richard L. Hauke +
(A. A. Eaton) J. H. Schaffner +
Equisetum variegatum var. nelsonii +
rounded +
0.3 cm3 mm <br />0.003 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Ont. +, Que. +, Ill. +, Ind. +, Mich. +, Minn. +, Mont. +, N.Y. +, Oreg. +, Wis. +  and Wyo. +
male +  and unisexual +
smaller than female +
Lakeshores, riverbanks. +
white +  and brown +
distinct +
Cones maturing in early summer, but spores not shed. +
Amer. Fern J. +
6 +  and 14 +
3.5mm;7.5mm +
elongate +
persisting +
in bands +  and scattered +
Equisetum ×nelsonii +
Equisetum subg. Equisetum +
species +
filiform +