  |
Alnus crispa (Green Alder) - http://www.borealforest.org/shrubs/shrub2.htm
Describes physical characteristics and habitat. Provides photo of branch with fruit and flowers. |
| |
Alnus maritima (Seaside Alder) - http://plants.usda.gov/java/profile?symbol=ALMA7
Images, plant synonyms, range map, scientific classification, and wetland indicator status. |
 |
Alnus nepalensis - http://www.botany.hawaii.edu/faculty/carr/images/aln_nep_mid.jpg
Photograph of flowering parts. |
| |
Alnus incana ssp. rugosa - http://www.fw.vt.edu/dendro/dendrology/syllabus/factsheet.cfm?ID=370
Description and range of the speckled alder, with photographs of twig, bark, leaves, catkins, cones and form. |
| |
Alnus cordata - http://ip30.eti.uva.nl/bis/flora.php?selected=beschrijving&menuentry=soorten&id=1772
Photograph, diagnostic features, habitat and distribution of Italian alder. |