Alnus rubra


Mém. Acad. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 2: 162. 1833

Common names: Red alder Oregon alder
EndemicSelected by author to be illustratedWeedy
Synonyms: Alnus oregona Nuttall Alnus rubra var. pinnatisecta Starker
Treatment appears in FNA Volume 3.
Click plate for higher resolution version.
Illustrator: John Myers
Trees, to 28 m; trunks often several, crowns narrow or pyramidal. Bark gray, smooth, darkening and breaking into shallow rectangular plates in age; lenticels inconspicuous. Winter buds stipitate, ellipsoid, 6–10 mm, apex rounded, long; stalks 2–8 mm; scales 2–3, outer 2 equal and valvate, usually heavily resin-coated. Leaf blade ovate to elliptic, 6–16 × 3–11 cm, leathery, base broadly cuneate to rounded, margins strongly revolute, deeply doubly serrate or crenate, with distinctly larger secondary teeth, apex acute to obtuse; surfaces abaxially glabrous to sparsely pubescent. Inflorescences formed season before flowering and exposed during winter; staminate catkins in 1 or more clusters of 2–6, 3.5–14 cm; sistillate catkins in 1 or more clusters of 3–8. Flowering before new growth in spring. Infructescences ovoid to nearly globose, 1–3.5 × 0.6–1.5 cm; peduncles 1–10 mm. Samaras ovate or elliptic, wings much narrower than body, irregularly elliptic to obovate, leathery. 2n = 28.

Phenology: Flowering early spring.
Habitat: Stream banks, moist flood plains, lake shores, wet slopes, and sandy, open coasts
Elevation: 0–300 m


V3 6-distribution-map.gif

B.C., Yukon, Alaska, Calif., Idaho, Oreg., Wash.


Alnus rubra is the largest alder in North America north of Mexico; it often forms extensive stands along streams and on low-lying flood plains in the Pacific Northwest. The strongly revolute margins of its leaf blades make it easily distinguished from all of the other alders in the flora. It is an important commercial tree; the wood is used to make inexpensive furniture, small wooden items, and paper pulp.

Native Americans used various parts of plants of Alnus rubra medicinally as a purgative, an emetic, for aching bones, headaches, coughs, biliousness, stomach problems, scrofula sores, tuberculosis, asthma, and eczema, and as a general panacea (D. E. Moerman 1986).



Lower Taxa

No lower taxa listed.

Facts about "Alnus rubra"
AuthorJohn J. Furlow +
AuthorityBongard +
Common nameRed alder + and Oregon alder +
DistributionB.C. +, Yukon +, Alaska +, Calif. +, Idaho +, Oreg. + and Wash. +
Elevation0–300 m +
HabitatStream banks, moist flood plains, lake shores, wet slopes, and sandy, open coasts +
IllustratorJohn Myers +
PhenologyFlowering early spring. +
Publication titleMém. Acad. Sci. St.-Pétersbourg, Sér. +
Publication year1833 +
ReferenceNone +
Source xml grained fna xml/V3/V3 6.xml +
Special statusEndemic +, Selected by author to be illustrated + and Weedy +
SynonymsAlnus oregona + and Alnus rubra var. pinnatisecta +
Taxon familyBetulaceae +
Taxon nameAlnus rubra +
Taxon parentAlnus +
Taxon rankspecies +
VolumeVolume 3 +