Alnus maritima (Marshall) Muhl. ex Nutt.
  • N. Amer. Sylv.
  • Seaside alder, brook alder

Cite taxon page as 'WFO (2021): Alnus maritima (Marshall) Muhl. ex Nutt. Published on the Internet; Accessed on: 07 Dec 2021'

General Information

Shrubs or trees , to 10 m; crowns narrow. Bark light gray, smooth; lenticels small, inconspicuous. Winter buds stipitate, ovoid to ellipsoid, 2.5--5 mm, apex rounded; stalks 1--3 mm; scales 2--3, subequal, often poorly developed, heavily resin-coated. Leaf blade narrowly elliptic, oblong, or narrowly obovate, 4.5--9 × 2--5 cm, leathery, base acute to cuneate, margins flat, teeth low, single, relatively distant, apex acute, obtuse, or rounded; surfaces abaxially mostly glabrous, resin-coated when young. Inflorescences: catkins formed during same season as flowering; staminate catkins in 1 terminal cluster of 2--4, 2--6 cm; pistillate catkins solitary in leaf axils proximal to staminate catkins. Flowering in late summer or early fall. Infructescences ovoid, 1.2--2.8 × 1.2--2.2 cm; peduncles 5--10 mm. Samaras elliptic, wings reduced to narrow, leathery ridges. 2 n = 28.

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

    "Tall shrub or small tree; lvs oblong to obovate, obtuse to short-acuminate, serrate with low, distant, ascending or incurved teeth, broadly cuneate at base, dull green and glabrous beneath; principal lateral veins mostly 5–8 on a side, mostly curved- ascending, often not reaching the margins; fruiting catkins evidently pedunculate, not leafy-bracteate, relatively large, 1.5–3 cm long, often 1.5 cm thick, with very broad scales; fr ovate to obovate, 3–4 mm, 2/3 as wide; catkins in anthesis in late summer or fall (unique among our spp.); 2n=28. Edges of ponds and small streams, often in standing water; Delmarva peninsula; disjunct in s.c. Okla., where said to have been intr. from Delmarva by relocated Indians. (A. metaporina)"

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

    Other Local Names

    Seaside alder, brook alder


     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
    International Union for Conservation of Nature
    IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
    • F All Rights Reserved
    International Union for Conservation of Nature v.3
    IUCN 2019. The IUCN Red List of Threatened Species. Version 2019-1.
    • G See IUCN Terms and conditions of use