Compilation
Equisetum robustum

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Name

Identification
Equisetum robustum A. Braun ex Engelm. [family EQUISETACEAE ] (stored under name); Verified by Not on sheet, Equisetum hyemale L. [family EQUISETACEAE ] Verified by A.A. Eaton,
Related name
  • Equisetum robustum
  • Equisetum hyemale

Flora

Entry for Equisetum hyemale subsp. affine (Engelmann) Calder & Roy L. Taylor [family EQUISETACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 2,
Names
Equisetum hyemale subsp. affine (Engelmann) Calder & Roy L. Taylor [family EQUISETACEAE], Canad. J. Bot., 43: 1387. 1965
Equisetum robustum A.Braun var. affine Engelmann [family EQUISETACEAE], Amer. J. Sci. Arts, 46: 88. 1844
Equisetum hyemale var. affine (Engelmann) A.A. Eaton [family EQUISETACEAE]
Equisetum hyemale var. californicum J.Milde [family EQUISETACEAE]
Equisetum hyemale var. pseudohyemale (Farwell) C.V. Morton [family EQUISETACEAE]
Equisetum hyemale var. robustum (A.Braun) A.A. Eaton [family EQUISETACEAE]
Equisetum prealtum Rafinesque [family EQUISETACEAE]
Treatment Author(s)
Richard L. Hauke
Information
Aerial stems persisting more than a year, unbranched, 18--220 cm; lines of stomates single; ridges 14--50. Sheaths when mature dark-girdled, brown to gray above girdle, squarish in face view, 4.5--17 × 3.5--18 mm; teeth 14--50, articulate and promptly shed or persistent. Cone apex pointed; spores green, spheric. 2 n =216.
Phenology
Cones maturing in summer, old stems sometimes developing branches with cones in spring
Altitude range
0--3000 m
Distribution
all other statesMexicoCentral America in Guatemala.USA Alaska including the Aleutian IslandsCanada Alta.Canada B.C.Canada Man.Canada N.B.Canada Nfld.Canada N.W.T.Canada N.S.Canada Ont.Canada P.E.I.Canada Que.Canada Sask.Canada Yukon
Discussion
In southern and central to western regions plants tend to be taller and have more persistent teeth ( Equisetum robustum , E . prealtum ); in the Far West they often have bituberculate ridges ( E . hyemale var. californicum ). Equisetum hyemale subsp. hyemale is found in Europe and Asia to northwestern China in Xinjiang.

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