View source for Sorbus americana

{{Treatment/ID
|accepted_name=Sorbus americana
|accepted_authority=Marshall
|publications={{Treatment/Publication
|title=Arbust. Amer.,
|place=145. 1785
|year=1785
}}
|common_names=American mountain ash;sorbier d’Amérique
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}{{Treatment/ID/Special_status
|code=F
|label=Selected by author to be illustrated
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Pyrus americana
|authority=(Marshall) Sprengel
}}
|hierarchy=Rosaceae;Rosaceae subfam. Amygdaloideae;Rosaceae tribe Gillenieae;Sorbus;Sorbus subg. Sorbus;Sorbus sect. Commixtae;Sorbus americana
|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 americana]]</div></div>
|volume=Volume 9
|mention_page=page 434, 435, 441
|treatment_page=page 439
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Shrubs </b>or trees, 40–100 dm. <b>Stems</b> 1–4+; bark gray to bronze; winter buds green to purple, shiny, ovoid to conic, 7–20 mm, glutinous, glabrous or hairy along scale margins and at apex, hairs primarily rufous. <b>Leaves</b> pinnately compound; stipules early deciduous, rufous-ciliate, margins sometimes glandular; blade paler abaxially, dull green to yellowish green adaxially, leaflets 11–17, opposite, lanceolate to oblong-lanceolate, 5–10 × 1–2.5 cm, l/w ratio 3.4–5, margins serrulate to serrate, at least in apical 1/2 and often almost to base, apex acuminate to long acuminate, surfaces glabrous or glabrate at flowering, some hairs occasionally persisting abaxially along midvein; leaflet axils and petiole bases glabrous or with rufous and/or whitish hairs adaxially. <b>Panicles</b> 125–400+-flowered, flat-topped or rounded, 6–15 cm diam.; peduncles glabrous or sparsely villous. <b>Pedicels</b> glabrous or sparsely villous. <b>Flowers</b> 5–7.5(–8.5) mm diam.; hypanthium glabrous, hypanthium plus sepals 2–2.5 mm; sepals 0.5–1 mm, margins entire, often with a few thick glands; petals white, orbiculate to obovate, (2–)2.5–3.5(–4) mm; stamens 14–20; carpels 1/2 adnate to hypanthium, apex conic, styles 3 or 4, 1.5–2 mm. <b>Infructescences</b> glabrous or sparsely villous. <b>Pomes</b> bright red to orange-red, globose to subglobose, 4–7 mm diam., shiny, not glaucous; sepals inconspicuous, incurved. <b>Seeds</b> brown, yellowish when fresh or immature, ovoid to ovoid-lanceoloid, 2.5–3.3 × 1.5–2 mm, asymmetric, slightly flattened. <b>2n</b> = 34.</span><!--

-->{{Treatment/Body
|phenology=Flowering spring; fruiting fall.
|habitat=Cool, moist woods, lake and stream shores, rocky hillsides, thickets
|elevation=0–1300 m
|distribution=St. Pierre and Miquelon;N.B.;Nfld. and Labr. (Nfld.);N.S.;Ont.;P.E.I.;Que.;Conn.;Ga.;Ill.;Maine;Md.;Mass.;Mich.;Minn.;N.H.;N.J.;N.Y.;N.C.;Pa.;R.I.;S.C.;Tenn.;Vt.;Va.;W.Va.;Wis.
|discussion=<p><i>Sorbus americana</i> reputedly flowers about one week earlier than <i>S. decora</i>. Some authors have described <i>S. americana</i> as having generally thinner leaflets relative to thicker and firmer ones for <i>S. decora</i>; examination of herbarium specimens appears to support this, though the authors made no systematic study of blade thickness. No confirmed putative hybrids with <i>S. decora</i> are reported, although hybridization may occur. The hybrid ×Sorbaronia jackii Rehder [<i>Aronia</i> ×prunifolia (Marshall) Rehder × <i>S. americana</i>; synonym <i>Pyrus</i> ×jackii (Rehder) Fernald] has been reported from New Brunswick as a fastigiate shrub 20 dm tall with leaves intermediate in appearance between the putative parents. Garden hybrids involving <i>S. americana</i> are occasionally cultivated in North America; none has been reported as escaped. These include: <i>Sorbus</i> ×splendida Hedlund (a hybrid with <i>S. aucuparia</i>), S. ×plantierensis Simon-Louis ex C. K. Schneider (with S. aria), ×Sorbaronia monstrosa (Zabel) C. K. Schneider (with <i>A. arbutifolia</i>), and ×Sorbaronia sorbifolia (Poiret) C. K. Schneider (with <i>A. melanocarpa</i>); synonyms of ×Sorbaronia sorbifolia include A. sargentii (Dippel) Zabel, A. watsoniana M. Roemer, and <i>Pyrus</i> ×mixta Fernald.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Sorbus americana
|author=
|authority=Marshall
|rank=species
|parent rank=section
|synonyms=Pyrus americana
|basionyms=
|family=Rosaceae
|phenology=Flowering spring; fruiting fall.
|habitat=Cool, moist woods, lake and stream shores, rocky hillsides, thickets
|elevation=0–1300 m
|distribution=St. Pierre and Miquelon;N.B.;Nfld. and Labr. (Nfld.);N.S.;Ont.;P.E.I.;Que.;Conn.;Ga.;Ill.;Maine;Md.;Mass.;Mich.;Minn.;N.H.;N.J.;N.Y.;N.C.;Pa.;R.I.;S.C.;Tenn.;Vt.;Va.;W.Va.;Wis.
|reference=None
|publication title=Arbust. Amer.,
|publication year=1785
|special status=Endemic;Selected by author to be illustrated
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V9/V9_741.xml
|subfamily=Rosaceae subfam. Amygdaloideae
|tribe=Rosaceae tribe Gillenieae
|genus=Sorbus
|subgenus=Sorbus subg. Sorbus
|section=Sorbus sect. Commixtae
|species=Sorbus americana
}}<!--

-->[[Category:Treatment]][[Category:Sorbus sect. Commixtae]]