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    THIS PAGE IS NO LONGER UPDATED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 RHAMNUS

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

  1. Terminal bud covered with scales; petals generally 0; style exserted (subg. Rhamnus)
 
    2. Leaves deciduous; sepals 5; fruit black, 3-stoned
R. alnifolia
    2' Leaves evergreen; sepals 4; fruit red, 2-stoned (R. crocea complex)
 
      3. Leaf blade < 15 mm, flat; branches spreading
R. crocea
      3' Leaf blade > 15 mm, lower side concave; branches generally ascending
 
        4. Leaf blade elliptic; small tree; Channel Islands
R. pirifolia
        4' Leaf blade ovate to round; shrub; mainland
 
          5. Branches stiff, twigs glabrous to densely hairy; California Floristic Province, Desert Mountains
R. ilicifolia
          5' Branches flexible, twigs densely hairy; Peninsular Ranges
R. pilosa
  1' Terminal bud not covered with scales; petals present; style including (subg. Frangula)
 
    6. Leaves thin, deciduous
 
      7. Fruit 3-stoned; leaf blade 50–150 mm, generally > 80 mm
R. purshiana
      7' Fruit 2-stoned; leaf blade 15–80 mm
R. rubra
    6' Leaves thick, generally evergreen (R. californica complex)
 
      8. Leaf blade ± glabrous on lower side
R. californica
        9. Fruit 2-stoned; blade dark green on upper side, bright green or yellow on lower
subsp. californica
        9' Fruit 3-stoned; blade ± equally yellow on both sides
subsp. occidentalis
      8' Leaf blade tomentose on lower side
R. tomentella
        10. Leaf margin entire or with blunt teeth
 
          11. Leaf blade widely elliptic; s Klamath Ranges, Inner North Coast Ranges
subsp. crassifolia
          11' Leaf blade narrowly elliptic; widespread
subsp. tomentella
        10' Leaf margin with sharp teeth
 
          12. Leaf margin dentate to dentate-serrate; c&s Sierra Nevada, Tehachapi Mountain Area, Transverse Ranges, Peninsular Ranges, San Jacinto Mountains
subsp. cuspidata
          12' Leaf margin serrate to ± entire; Desert Mountains
subsp. ursina


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