Difference between revisions of "Alnus alnobetula"
in J. Lamarck and A. P. de Candolle, Fl. Franç. ed. 3, 3: 304. 1805.
Basionym: Betula viridis Villars
Synonyms: Alnus alnobetula (Ehrhart) K. KochAlnus ovata (Schrank) Loddiges
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> spreading to compact, to 10 m. <b>Bark</b> smooth; lenticels scattered, conspicuous to inconspicuous, small, mostly unenlarged. <b>Winter</b> buds nearly sessile, ovoid, apex acuminate; stalks usually not over 1 mm; scales 4–6, unequal, imbricate. <b>Leaf</b> blade broadly to narrowly ovate or elliptic, 3–11 × 3–8 cm, base rounded, obtuse, or cuneate, sometimes nearly cordate, margins serrulate to coarsely doubly serrate, apex acute to rounded; surfaces abaxially glabrous to tomentose, lightly to heavily resin-coated. <b>Inflorescences</b>: staminate catkins in 1 cluster of 2–4, formed late in growing season before flowering and exposed during winter; pistillate catkins in 1 or more clusters of 2–10, formed season before blooming, enclosed in buds during winter, exposed with new growth in spring. <b>Flowering</b> with new growth in spring. <b>Infructescences</b> ovoid to ellipsoid or nearly cylindric; peduncles relatively long, thin. <b>Samaras</b> elliptic to obovate, wings wider than body, membranaceous.</span><!-- |
-->{{Treatment/Body | -->{{Treatment/Body | ||
| − | |distribution=Southern arctic;subarctic;and n mountainous regions;North America and Asia | + | |distribution=Southern arctic;subarctic;and n mountainous regions;North America and Asia. |
|discussion=<p>Subspecies 4 (3 in the flora).</p><!-- | |discussion=<p>Subspecies 4 (3 in the flora).</p><!-- | ||
--><p>Alnus viridis is distinctive among the alders in its essentially sessile buds with several imbricate scales and in its relatively long, thin, infructescence peduncles. Like the birches, only the staminate catkins are exposed during the winter prior to blooming.</p> | --><p>Alnus viridis is distinctive among the alders in its essentially sessile buds with several imbricate scales and in its relatively long, thin, infructescence peduncles. Like the birches, only the staminate catkins are exposed during the winter prior to blooming.</p> | ||
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|basionyms=Betula viridis | |basionyms=Betula viridis | ||
|family=Betulaceae | |family=Betulaceae | ||
| − | |distribution=Southern arctic;subarctic;and n mountainous regions;North America and Asia | + | |distribution=Southern arctic;subarctic;and n mountainous regions;North America and Asia. |
|reference=None | |reference=None | ||
|publication title=in J. Lamarck and A. P. de Candolle, Fl. Franç. ed. | |publication title=in J. Lamarck and A. P. de Candolle, Fl. Franç. ed. | ||
|publication year=1805 | |publication year=1805 | ||
|special status= | |special status= | ||
| − | |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_755.xml |
|subfamily=Betulaceae subfam. Betuloideae | |subfamily=Betulaceae subfam. Betuloideae | ||
|genus=Alnus | |genus=Alnus | ||
|species=Alnus viridis | |species=Alnus viridis | ||
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-->[[Category:Treatment]][[Category:Alnus]] | -->[[Category:Treatment]][[Category:Alnus]] | ||
Revision as of 14:49, 27 July 2019
Shrubs, spreading to compact, to 10 m. Bark smooth; lenticels scattered, conspicuous to inconspicuous, small, mostly unenlarged. Winter buds nearly sessile, ovoid, apex acuminate; stalks usually not over 1 mm; scales 4–6, unequal, imbricate. Leaf blade broadly to narrowly ovate or elliptic, 3–11 × 3–8 cm, base rounded, obtuse, or cuneate, sometimes nearly cordate, margins serrulate to coarsely doubly serrate, apex acute to rounded; surfaces abaxially glabrous to tomentose, lightly to heavily resin-coated. Inflorescences: staminate catkins in 1 cluster of 2–4, formed late in growing season before flowering and exposed during winter; pistillate catkins in 1 or more clusters of 2–10, formed season before blooming, enclosed in buds during winter, exposed with new growth in spring. Flowering with new growth in spring. Infructescences ovoid to ellipsoid or nearly cylindric; peduncles relatively long, thin. Samaras elliptic to obovate, wings wider than body, membranaceous.
Distribution
Southern arctic, subarctic, and n mountainous regions, North America and Asia.
Discussion
Subspecies 4 (3 in the flora).
Alnus viridis is distinctive among the alders in its essentially sessile buds with several imbricate scales and in its relatively long, thin, infructescence peduncles. Like the birches, only the staminate catkins are exposed during the winter prior to blooming.
Selected References
None.
Lower Taxa
Key
| 1 | Leaf blade coarsely doubly serrate, thin, light or yellowish green, glabrous to sparsely pubescent; mountainous nw United States, Alaska, and Canada. | Alnus viridis subsp. sinuata |
| 1 | Leaf blade serrulate to finely and densely serrate or doubly serrate, firm, dark green, sometimes abaxially sparsely to densely pubescent. | > 2 |
| 2 | Leaf blade broadly to narrowly ovate or elliptic, margins serrulate or finely serrate, apex obtuse to acute; e United States, n Canada, Alaska, and s Greenland. | Alnus viridis subsp. crispa |
| 2 | Leaf blade broadly ovate, margins sharply and densely doubly serrate, apex acute to short-acuminate; w coastal North America, adjacent subarctic Asia. | Alnus viridis subsp. fruticosa |