Compilation
Alnus rugosa

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Name

Identification
Alnus rugosa (Aiton) H.Winkl. [family BETULACEAE ] Alnus serrulata (Aiton) Willd. [family BETULACEAE ] (stored under name);
Related name
  • Alnus serrulata
  • Alnus rugosa
Common name
  • tag alder, Flora of North America Vol. 3
  • Smooth alder, Flora of North America Vol. 3
  • swamp alder, Flora of North America Vol. 3
  • hazel alder, Flora of North America Vol. 3
  • aulne blanchâtre, Flora of North America Vol. 3
  • mountain alder, Flora of North America Vol. 3
  • Thinleaf alder, Flora of North America Vol. 3
  • Speckled alder, Flora of North America Vol. 3

Flora

Entry for Alnus incana (Linnaeus) Moench subsp. rugosa (Du Roi) R. T. Clausen [family BETULACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 3,
Names
Alnus incana (Linnaeus) Moench subsp. rugosa (Du Roi) R. T. Clausen [family BETULACEAE], Cornell Univ. Agric. Exp. Sta. Mem., 291: 8. 1949
Betula alnus Linnaeus var. rugosa Du Roi [family BETULACEAE], Diss. Observ. Bot., 31. 1771
Alnus glauca Michaux [family BETULACEAE]
Alnus incana var. americana Regel [family BETULACEAE]
Alnus rugosa (Du Roi) Sprengel var. americana (Regel) Fernald [family BETULACEAE]
Alnus rugosa var. rugosa [family BETULACEAE]
Alnus rugosa var. tomophylla (Fernald) Fernald [family BETULACEAE]
Information
Shrubs, open, spreading, to 9 m. Bark dark grayish to reddish brown, smooth; lenticels whitish, prominent, horizontal. Winter buds parallel to twig, ellipsoid, 3--7 mm, apex acute or obtuse; stalks 2--4 mm. Leaf blade ovate to elliptic, 4--11 × 3--8 cm, firm, base cuneate to narrowly rounded, margins usually coarsely doubly serrate, toothed to base, apex acute or short-acuminate to slightly obtuse; surfaces abaxially often glaucous, glabrous to sparsely pubescent, often more densely so on veins, slightly to not noticeably resin-coated. Inflorescences: staminate catkins in 1 or more clusters of 2--4, 2--7 cm; pistillate catkins in 1 or more clusters of 2--6. Infructescences ovoid, 1--1.7 × 0.8--1.2 cm; peduncles 1--5 mm. 2n = 28.
Phenology
Flowering early spring
Altitude range
0--800 m
Distribution
St. Pierre and MiquelonUSA Conn.USA Ill.USA Ind.USA IowaUSA MaineUSA Md.USA Mass.USA Mich.USA Minn.USA N.H.USA N.J.USA N.Y.USA N.Dak.USA OhioUSA Pa.USA R.I.USA Vt.USA Va.USA W.Va.USA Wis.Canada Man.Canada N.B.Canada Nfld.Canada N.S.Canada Ont.Canada P.E.I.Canada Que.Canada Sask.
Discussion
Alnus incana subsp. rugosa is an important shoreline and meadow colonizer in boreal and north temperate areas of the Canadian Shield, and a weedy successional species in damp areas along roadsides throughout its range. It overlaps in range and intergrades with A. incana subsp. tenuifolia to the west (in Saskatchewan and Manitoba) and with A. serrulata to the south. It is only slightly differentiated from the more treelike European A. incana subsp. incana.

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