Arizona alder Betulaceae Alnus oblongifolia Torr. Listen to the Latin symbol: ALOB2 Other Fact Sheets
Leaf: Alternate, simple, ovate to oblong, V-shaped base, 2 to 3 1/2 inches long, doubly serrate, dark green above, paler with a few scattered hairs below particularly in leaf axils.
Flower: Species is monoecious; males are yellow-green elongated, catkins about 2 to 3 inches long, in hanging clusters; females are very small (1/4 inch) reddish green appearing in early spring.
Fruit: Cone-like, woody, 1/2 inch long, green but turning reddish brown when ripe, contains numerous small winged seeds, ripen in early fall and persist through the winter.
Twig: Slender, yellow brown with fine fuzz when young; buds are stalked, red and long up to 1/2 inch.
Bark: Gray-brown and smooth with numerous short lenticels when young, later developing rectangular, flat narrow plates a bit scaly.
Form: An upright medium sized tree with a narrow crown reaching up to 70 feet in height.

Looks like: red alder - white alder - European black alder - Italian alder
leaf flower fruit twig bark form1 map
Additional Range Information:
Alnus oblongifolia is native to North America.
Range may be expanded by planting.
See states reporting Arizona alder.
External Links:
USDA Plants Database
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Photos and text by: John Seiler,
Edward Jensen, Alex Niemiera,
and John Peterson
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