Common trees in montane second growth forests; vegetatively unique in South- and Middle-America by the doubly toothed leaf margin (with teeth over secondary vein endings slightly larger). Characterized by the close together straight ascending secondary veins with rigidly parallel tertiary veins perpendicular to the secondaries. Perhaps only one species in South America: Alnus acuminata
Distribution
Alnus with 3 species; plus 30 in the USA and Old World
Leaf characters
alternate, simple; with doubly toothed leaf margin
Stipules
absent
Glands
absent
Hairs
present
Distribution maps
(online von http://www.mobot.org/MOBOT/research/APweb/ . Dort zitiert wie unter jedem Diagramm vermerkt):
