Sorbus americana Marshall
  • Arbustrum americanum: the american grove
  • American mountain ash, sorbier d’Amérique

Cite taxon page as 'WFO (2021): Sorbus americana Marshall. Published on the Internet; Accessed on: 24 Oct 2021'

General Information

Shrubs or trees, 40–100 dm. Stems 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. Leaves 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. Panicles 125–400+-flowered, flat-topped or rounded, 6–15 cm diam.; peduncles glabrous or sparsely villous. Pedicels glabrous or sparsely villous. Flowers 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. Infructescences glabrous or sparsely villous. Pomes bright red to orange-red, globose to subglobose, 4–7 mm diam., shiny, not glaucous; sepals inconspicuous, incurved. Seeds brown, yellowish when fresh or immature, ovoid to ovoid-lanceoloid, 2.5–3.3 × 1.5–2 mm, asymmetric, slightly flattened. 2n = 34.

  • Provided by: [B].Flora of North America @
    • Source: [
    • 1
    • ]. 

    "Shrub or tree to 10(–15) m; twigs glabrous or nearly so; winter-buds glutinous, with glabrous or sparsely ciliate scales; lfls lanceolate to narrowly oblong, gradually acuminate, 5–9 cm, mostly 3–5 times as long as wide, sharply serrate, paler and usually glabrous beneath; infl 6–15 cm wide; hypanthium and sep glabrous; pet obovate, 3–4 mm, narrowed to the base, equaling or longer than the stamens; fr 4–7 mm thick; 2n=34. In moist or wet soil; Nf. to Minn., s. to Pa. and n. Ill., and in the mts. to n. Ga. May, June. (Pyrus a.)"

  • Provided by: [A].New York Botanical Garden
    • Source: [
    • 2
    • ]. 

    Other Local Names

    American mountain ash, sorbier d’Amérique


     Information From

    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • A Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    Flora of North America @
    'Flora of North America @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • B Flora of North America Association
    Global Tree Search
    BGCI. 2018. GlobalTreeSearch online database. Botanic Gardens Conservation International. Richmond, U.K. Available at Accessed on 30/11/2018.
    • C Botanic Gardens Conservation International
    CC0 1.0 Universal (CC0 1.0).
    • D CC0 1.0 Universal (CC0 1.0).
    World Flora Online consortium
    World Flora Online Data. 2018.
    • E CC0 1.0 Universal (CC0 1.0).