View source for Sorbus scopulina

{{Treatment/ID
|accepted_name=Sorbus scopulina
|accepted_authority=Greene
|publications={{Treatment/Publication
|title=Pittonia
|place=4: 130. 1900
|year=1900
}}
|common_names=Rocky Mountain or Cascade or Greene's mountain ashE
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Sorbus andersonii
|authority=G. N. Jones
}} {{Treatment/ID/Synonym
|name=S. angustifolia
|authority=Rydberg
}} {{Treatment/ID/Synonym
|name=S. cascadensis
|authority=G. N. Jones
}} {{Treatment/ID/Synonym
|name=S. dumosa
|authority=Greene
}} {{Treatment/ID/Synonym
|name=S. scopulina var. cascadensis
|authority=(G. N. Jones) C. L. Hitchcock
}}
|hierarchy=Rosaceae;Rosaceae subfam. Amygdaloideae;Rosaceae tribe Gillenieae;Sorbus;Sorbus subg. Sorbus;Sorbus sect. Commixtae;Sorbus scopulina
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Rosaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Rosaceae subfam. Amygdaloideae]]</div><div class="higher-taxon"><small>tribe</small>[[Rosaceae tribe Gillenieae]]</div><div class="higher-taxon"><small>genus</small>[[Sorbus]]</div><div class="higher-taxon"><small>subgenus</small>[[Sorbus subg. Sorbus]]</div><div class="higher-taxon"><small>section</small>[[Sorbus sect. Commixtae]]</div><div class="higher-taxon"><small>species</small>[[Sorbus scopulina]]</div></div>
|volume=Volume 9
|mention_page=page 435, 443, 444, 651
|treatment_page=page 442
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Shrubs,</b> 10–50(–80) dm. <b>Stems</b> 1–8; bark gray, sometimes yellowish or reddish purple, or grayish red; winter buds olive brown to red-brown, conic, 8–14 mm, shiny, slightly glutinous, glabrous or sparsely or densely whitish-villous. <b>Leaves</b> pinnately compound; stipules deciduous or persistent, hairs whitish; blade paler abaxially, shiny, green to dark green adaxially, leaflets 7–13(–15), opposite or subopposite, lanceolate, oblong, narrowly ovate, oblanceolate, or obovate, (3–)4–6.5(–8.7) × 1.5–2.7 cm, l/w ratio 2.1–4.4, margins finely serrate, apex obtuse, acute, or acuminate, surfaces glabrous, leaf and leaflet axils hairy, hairs whitish. <b>Panicles</b> 40–200+-flowered, flat-topped to rounded, 5–15 cm diam.; peduncles sparsely to densely whitish-villous. <b>Pedicels</b> sparsely to densely whitish-villous (in flower and fruit). <b>Flowers</b> 11–13 mm diam.; hypanthium nearly glabrous or densely villous, hypanthium plus sepals 3–4 mm; sepals 0.8–2.3 mm, margins lightly to densely whitish-villous, glands absent or sparse and usually inconspicuous; petals white, ovate, 4–6 mm; stamens (14–)20; carpels distinct, apex conic, styles 3 or 4, 2–2.5 mm. <b>Infructescences</b> whitish-villous, rarely glabrous with age. <b>Pomes</b> bright orange to reddish orange, globose, subglobose, broadly obovoid, or broadly elliptic, 8–12.1 × 7.5–12.8 mm, shiny, sometimes lightly glaucous; sepals inconspicuous, incurved. <b>Seeds</b> brown, narrowly ovoid, 3.8–5.4 × 1.7–2.8 mm, slightly asymmetric, slightly flattened. <b>2n</b> = 34, 68.</span><!--

-->{{Treatment/Body
|phenology=Flowering spring; fruiting fall.
|habitat=Mountain slopes, open forests, forest edges, riparian zones, lakeshores
|elevation=0–3300 m
|distribution=Alta.;B.C.;N.W.T.;Sask.;Yukon;Alaska;Ariz.;Calif.;Colo.;Idaho;Mont.;Nev.;N.Mex.;Oreg.;S.Dak.;Utah;Wash.;Wyo.
|discussion=<p><i>Sorbus scopulina</i> is variable, especially in leaflet shape, number, and indument. Plants with narrower leaflets were separated as <i>S. angustifolia</i>; plants with broader leaflets were segregated as S. andersonii and <i>S. cascadensis</i>. Densely hairy forms were named S. dumosa. All represent points on a morphologic continuum, united by their shiny leaflets, whitish indument, and western range. Sparsely hairy forms approach the more southern <i>S. californica</i> but have whitish axillary hairs and larger leaflets than that species, which has rufous axillary hairs and leaflets less than 4 cm. Most <i>S. scopulina</i> have shiny hypanthia and fruits. Occasional collections, all within the range of <i>S. sitchensis</i>, are glaucous-fruited. This may be natural variation, or it could represent introgression from <i>S. sitchensis</i>. H. A. McAllister (2005, pers. comm.) found that individuals of <i>S. scopulina</i> from cordilleran Idaho and Arizona were sexual diploids; plants from the Cascade and Coast ranges of British Columbia and Washington were tetraploid and presumably apomictic. Here, these entities are synonymized, awaiting a larger study that might correlate distinct morphologic characteristics with the ploidy levels. J. J. Aldasoro et al. (1998, 2004) noted that some European <i>Sorbus</i> species are both diploid and tetraploid, suggesting that sexual species occasionally produce spontaneous agamospermous individuals.</p><!--
--><p>The intergeneric hybrid ×Amelasorbus jackii Rehder [<i>Amelanchier alnifolia</i> (Nuttall) Nuttall ex M. Roemer × <i>Sorbus scopulina</i>] has been collected in Idaho and Oregon. Foliage of the Idaho collection is very similar to that of <i>Amelanchier</i>, with basal pinnae inconspicuous and infrequent, suggesting that this hybrid may be overlooked.</p><!--
--><p>The illegitimate later homonym <i>Sorbus</i> alaskana G. N. Jones pertains here.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Sorbus scopulina
|author=
|authority=Greene
|rank=species
|parent rank=section
|synonyms=Sorbus andersonii;S. angustifolia;S. cascadensis;S. dumosa;S. scopulina var. cascadensis
|basionyms=
|family=Rosaceae
|phenology=Flowering spring; fruiting fall.
|habitat=Mountain slopes, open forests, forest edges, riparian zones, lakeshores
|elevation=0–3300 m
|distribution=Alta.;B.C.;N.W.T.;Sask.;Yukon;Alaska;Ariz.;Calif.;Colo.;Idaho;Mont.;Nev.;N.Mex.;Oreg.;S.Dak.;Utah;Wash.;Wyo.
|reference=None
|publication title=Pittonia
|publication year=1900
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V9/V9_744.xml
|subfamily=Rosaceae subfam. Amygdaloideae
|tribe=Rosaceae tribe Gillenieae
|genus=Sorbus
|subgenus=Sorbus subg. Sorbus
|section=Sorbus sect. Commixtae
|species=Sorbus scopulina
}}<!--

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