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Alnus maritima (Seaside alder) | NPIN

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Alnus maritima

Seaside alder

Betulaceae (Birch Family)

USDA Symbol: ALMA7

USDA Native Status:

Small, autumn flowering tree with straight trunk and narrow, rounded crown, or a much-branched shrub. Both common and Latin species names refer to the local but not rare distribution near (but not on) the coast. The isolated occurrence in southern Oklahoma is unexplained.


From the Image Gallery

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Plant Characteristics

Duration: Perennial
Habit: Shrub , Tree
Leaf Retention: Deciduous
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Leaf Shape: Elliptic , Obovate
Leaf Venation: Pinnate
Leaf Pubescence: Glabrous
Leaf Margin: Serrate
Leaf Apex: Acute , Obtuse
Leaf Base: Cuneate
Leaf Texture: Leathery
Breeding System: Flowers Unisexual , Monoecious
Size Notes: Height to 10 M.
Leaf: Green
Size Class: 12-36 ft.

Bloom Information

Bloom Time: Jul , Aug


USA: DE , GA , MD , OK
Native Distribution: S. Delaware, E. shore of Maryland, and S. Delaware near sea level; S. Oklahoma at 700 (213 m).
Native Habitat: Wet soil bordering streams and ponds.

Growing Conditions

Water Use: High
Light Requirement: Part Shade
CaCO3 Tolerance: Low

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Mt. Cuba Center - Hockessin, DE

Recommended Species Lists

Find native plant species by state. Each list contains commercially available species suitable for gardens and planned landscapes. Once you have selected a collection, you can browse the collection or search within it using the combination search.

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Additional resources

USDA: Find Alnus maritima in USDA Plants
FNA: Find Alnus maritima in the Flora of North America (if available)
Google: Search Google for Alnus maritima


Record Modified: 2007-01-01
Research By: TWC Staff

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