Equisetum ×mackaii

(Newman) Brichan

Phytologist 1: 369. 1843 (Nov. 1842.

Basionym: Equisetum hyemale var. mackaii Newman Phytologist 1: 305. 1843 (Sept. 1842)
Synonyms: Equisetum hyemale subsp. trachyodon A.Braun Equisetum ×trachyodon Schleicher ex F. Weber & D. Mohr Equisetum variegatum var. jesupii A.A. Eaton
Treatment appears in FNA Volume 2.
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Aerial stems persisting more than a year, unbranched, 20–86 cm; lines of stomates single; ridges 7–16. Sheaths black or black-girdled and white distally, appressed, elongate, 3.5–8 × 2–5.5 mm; teeth 7–16, centers dark, margins white, prominent, not articulate, tip usually brown, long, filiform. Cone apex pointed; spores white, misshapen.


Phenology: Cones maturing in late summer, but misshapen spores not shed.
Habitat: Lakeshores, riverbanks, marshes
Elevation: 0–500 m

Distribution

V2 531-distribution-map.gif

Greenland, B.C., N.B., Nfld. and Labr. (Nfld.), Ont., Que., Sask., Conn., Ill., Ind., Maine, Mich., Minn., Mont., N.H., N.J., N.Y., Ohio, Oreg., Vt., Wis., n Europe

Discussion

The hybrid between Equisetum hyemale and E. variegatum, E. × mackaii, is often mistaken for small forms of E. hyemale. I have not seen specimens for the reports from Connecticut and New Hampshire.

Selected References

None.

Lower Taxa

None.
... more about "Equisetum ×mackaii"
Richard L. Hauke +
(Newman) Brichan +
Equisetum hyemale var. mackaii +
rounded +
0.3 cm3 mm <br />0.003 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Greenland +, B.C. +, N.B. +, Nfld. and Labr. (Nfld.) +, Ont. +, Que. +, Sask. +, Conn. +, Ill. +, Ind. +, Maine +, Mich. +, Minn. +, Mont. +, N.H. +, N.J. +, N.Y. +, Ohio +, Oreg. +, Vt. +, Wis. +  and n Europe +
0–500 m +
male +  and unisexual +
smaller than female +
Lakeshores, riverbanks, marshes +
not articulate +
distinct +
Cones maturing in late summer, but misshapen spores not shed. +
Phytologist +
7 +  and 16 +
3.5mm;8mm +
elongate +
2mm;5.5mm +
persisting +
20 cm200 mm <br />0.2 m <br /> (86 cm860 mm <br />0.86 m <br />) +
in bands +  and scattered +
Equisetum hyemale subsp. trachyodon +, Equisetum ×trachyodon +  and Equisetum variegatum var. jesupii +
Equisetum ×mackaii +
Equisetum subg. Equisetum +
species +
filiform +