familyBetulaceae
subfamilyBetulaceae subfam. Betuloideae
genusAlnus
speciesAlnus incana
subspeciesAlnus incana subsp. rugosa
Difference between revisions of "Alnus incana subsp. rugosa"
Cornell Univ. Agric. Exp. Sta. Mem. 291: 8. 1949.
Common names: Speckled alder tag alder swamp alder aulne blanchâtre
EndemicWeedy
Basionym: Betula alnus var. rugosa Du Roi
Synonyms: Alnus glauca MichauxAlnus incana var. americana RegelAlnus rugosa var. americana (Regel) FernaldAlnus rugosa var. rugosa (Fernald) FernaldAlnus rugosa var. tomophylla unknown
Treatment appears in FNA Volume 3.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Shrubs,</b> open, spreading, to 9 m. <b>Bark</b> dark grayish to reddish brown, smooth; lenticels whitish, prominent, horizontal. <b>Winter</b> buds parallel to twig, ellipsoid, 3–7 mm, apex acute or obtuse; stalks 2–4 mm. <b>Leaf</b> 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. <b>Inflorescences</b>: staminate catkins in 1 or more clusters of 2–4, 2–7 cm; pistillate catkins in 1 or more clusters of 2–6. <b>Infructescences</b> ovoid, 1–1.7 × 0.8–1.2 cm; peduncles 1–5 mm. <b>2n</b> = 28.</span><!-- |
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|publication year=1949 | |publication year=1949 | ||
|special status=Endemic;Weedy | |special status=Endemic;Weedy | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna- | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V3/V3_149.xml |
|subfamily=Betulaceae subfam. Betuloideae | |subfamily=Betulaceae subfam. Betuloideae | ||
|genus=Alnus | |genus=Alnus | ||
|species=Alnus incana | |species=Alnus incana | ||
|subspecies=Alnus incana subsp. rugosa | |subspecies=Alnus incana subsp. rugosa | ||
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Revision as of 13:34, 27 July 2019
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.
Habitat: Stream banks, lake shores, bogs, swamps, margins of wet fields, swales, and roadsides, often forming dense thickets
Elevation: 0–800 m
Distribution
St. Pierre and Miquelon, Man., N.B., Nfld., N.S., Ont., P.E.I., Que., Sask., Conn., Ill., Ind., Iowa, Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.Dak., Ohio, Pa., R.I., Vt., Va., W.Va., Wis.
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.
Selected References
None.
Lower Taxa
None.