Monoecious flowers; Male catkins (brownish-yellow, form in clusters of 2-5, 2-4" long); Female catkins (bright red flowers, clusters of 2-5, 1/4" long); Blooms in March-April
Foliage Notes:
Alternate, simple, 2 to 4" long, 1 1/4 to 2 1/2" wide. ovate or obovate with fine teeth along margin
Stem Notes:
Brown stems
Fruit Notes:
Dark Brown (woody, cone-like catkins ripen in fall and persist into the winter)
Closely related to Alnus rugosa, differing chiefly in its leaves, which are usually broadest above the middle and have the margins set with fine, nearly regular teeth. Multi-stemmed habit and tends to sucker.