Betula pumila L.
  • Mant. Pl.
  • Bog birch, dwarf birch, bouleau nain

Cite taxon page as 'WFO (2021): Betula pumila L. Published on the Internet; Accessed on: 15 Jun 2021'

General Information

Shrubs , coarse, irregular, or spreading, to 4 m. Bark dark reddish brown, smooth, close; lenticels pale, inconspicuous. Twigs without taste and odor of wintergreen, glabrous to moderately pubescent, with scattered small resinous glands, especially near nodes. Leaf blade elliptic, obovate, or nearly orbiculate (to sometimes reniform) with 2--6 pairs of lateral veins, 2.5--5(--7) × 1--5 cm, base cuneate to rounded, margins crenate to dentate, apex usually broadly acute or obtuse to rounded; surfaces abaxially glabrous or slightly pubescent to heavily velutinous or tomentose, often with scattered resinous glands. Infructescences erect, cylindric, 0.8--1.5(--2) × 0.8--1 cm, shattering with fruits in fall; scales glabrous to pubescent, lobes diverging slightly distal to middle, central lobe narrow, elongate, lateral lobes shorter and broader, extended. Samaras with wings slightly narrower than body, broadest near center, not extended beyond body apically. 2 n = 56.

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

    "Erect, branching shrub 1–4 m, with close, brown bark; lvs firm, obovate to broadly ovate or orbicular, 2–3 cm, obtuse to broadly rounded above, coarsely dentate, rounded to broadly cuneate at base, softly pubescent on both sides when young, glabrescent with age, the hairs mostly 1–2 mm; lateral veins 3–6 pairs, the veinlets conspicuously raised-reticulate; fruiting catkins 1–2 cm, on peduncles 5–10 mm; scales 2.8–5.5 mm, about as wide, the lateral lobes widely divergent, often constricted at base; frs depressed-obovate to subrotund or oblate, truncate or rounded above, 1.6–2.8 × 1.8–3.7 mm, the body half as wide as the whole fr; 2n=56. In bogs, often forming large colonies; Nf. and Que. to s. Ont. and Mich., s. to N.J., Md., c. O., and n. Ind."

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

    Other Local Names

    Bog birch, dwarf birch, bouleau nain


     Information From

    World Flora Online Data. 2017.
    • A CC0 1.0 Universal (CC0 1.0).
    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.
    • B 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.
    • C Flora of North America Association
    World Flora Online consortium
    World Flora Online Data. 2018.
    • D CC0 1.0 Universal (CC0 1.0).