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Reference.org
Alder
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<p>Alders are <a href="/facts/Tree/HVVn3srN">trees</a> of the genus <i>Alnus</i> in the birch family <a href="/facts/Betulaceae/Q1G1xg7G">Betulaceae</a>. The genus includes about 35 species of <a href="/facts/Monoecious/Up20kQT3">monoecious</a> trees and <a href="/facts/Shrub/X1gKVxL5">shrubs</a>, a few reaching a large size, distributed throughout the <a href="/facts/Temperate_climate/6WPypCzC">north temperate zone</a> with a few species extending into <a href="/facts/Central_America/CXKgTuxC">Central America</a>, as well as the northern and southern <a href="/facts/Andes/a4wlgG3e">Andes</a>. </p>