red alder

Alnus rubra

Member of alders (genus Alnus)
birch family (family Betulaceae)
dicots (class Magnoliopsida)
other colors in flowering plants

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CalPhotos
leaf rolled under

• leaf margin doubly serrate [large teeth with uneven edges]
• leaf edge tightly rolled under [hard to see since it’s just a mm or two at the edge]

Toxicity of alder tree (Alnus spp.):
1 – Skin contact with these plants can cause symptoms ranging from redness, itching, and rash to painful blisters like skin burns.

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Chris’s observations: 6 (5 are research grade)

Locations:

• Murray Ranch SP: 5
• Wilder Ranch SP

Months:

• Jun.: 1
• Jul.: 2
• Aug.: 3

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Taxon info: iNaturalist – Calflora – CalPhotos – Jepson eFlora – FNA

Bay Area species: iNaturalist – Calflora