Alnus incana (L.) Moench
  • Methodus

Cite taxon page as 'WFO (2020): Alnus incana (L.) Moench. Published on the Internet; Accessed on: 24 Sep 2020'

General Information

Trees and shrubs , to 25 m; crowns open. Bark light to dark gray, reddish, or brown, smooth, or in age broken into irregular plates; lenticels present or absent, conspicuous, enlarged or unexpanded. Winter buds stipitate, ellipsoid, 4--7 mm, apex rounded to nearly acute; stalk 1--3 mm; scales 2--3, equal, valvate, resin-coated. Leaf blade narrowly ovate to elliptic, base cuneate to narrowly rounded, margins doubly serrate, with distinctly larger secondary teeth, apex acute or short-acuminate to obtuse. Inflorescences formed season before flowering and exposed during winter. Flowering before new growth in spring. Infructescences ovoid to nearly cylindric; peduncles relatively short and stout. Samaras elliptic to obovate, wings narrower than body, irregular in shape.

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

    "Tall colonial shrub or small tree; winter buds evidently stalked, with 2–3 equal scales; lvs oval, elliptic, or ovate, broadest near or below the middle, obtuse to short- acuminate, sharply and irregularly double-serrate or almost lobulate, broadly obtuse to rounded at base, with mostly 8–14 principal veins on a side, soon becoming pale and glaucous beneath, ± pubescent, especially on the veins, not glutinous; staminate catkins mature before the lvs begin to open; anthers virtually sessile; fruiting catkins mostly sessile or only short-pedunculate, crowded in small, naked infls, 1–1.5(2) cm, seldom much over 1 cm thick; frs 2–3.5 mm, narrowly coriaceous-winged or merely thin-margined; 2n=28. Wet soil; circumboreal, s. to Md., W.Va., Ill., and the w. cordillera. E. Amer. pls, as here described, are var. americana Regel (A. rugosa; A. incana ssp. rugosa)"

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



     Information From

    World Flora Online Data. 2017.
    • A CC0 1.0 Universal (CC0 1.0).
    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
    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.
    • C Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    World Flora Online consortium
    World Flora Online Data. 2018.
    • D CC0 1.0 Universal (CC0 1.0).
    Global Tree Search
    BGCI. 2018. GlobalTreeSearch online database. Botanic Gardens Conservation International. Richmond, U.K. Available at Accessed on 30/11/2018.
    • E Botanic Gardens Conservation International