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.

Habitat: Lakeshores, riverbanks.

Distribution

• Generated Map
• Legacy Map

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.