Jepson Flora Project: Jepson Interchange    
 

The Jepson Manual: Higher Plants of California

    THIS PAGE IS NO LONGER UPDATED
    AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

Names are linked to treatments from the Manual


Key to ALNUS

N.B.: couplets are linked, e.g., 1. is linked to 1'.

  1. Fresh leaf thin, ± translucent, bright green on both surfaces, hairs on lower restricted to or denser in major vein axils; montane shrub
A. viridis subsp. sinuata
  1' Fresh leaf thick, opaque, dull green on both surfaces, hairs on lower, if present, not restricted to or denser in major vein axils; coastal or lowland tree or montane shrub
 
    2. Leaf margin tightly rolled under; coastal tree
A. rubra
    2' Leaf margin generally ± flat; lowland tree or montane shrub
 
      3. Leaf midrib, major veins on upper surface generally indented; montane shrub, 1200–2400 m
A. incana subsp. tenuifolia
      3' Leaf midrib, major veins on upper surface generally not indented; generally lowland tree, 100–2400 m
A. rhombifolia


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