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    THIS PAGE IS NO LONGER UPDATED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 EUPHORBIA

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

  1. Involucre with petal-like appendages on glands; stipules present, gland-like, minute
 
    2. Leaves opposite, margin finely toothed; annual; seed with a knob at tip
E. exstipulata var. exstipulata
    2' Leaves alternate, margin entire; woody; seed without a knob
E. misera
  1' Involucre without petal-like appendages on glands; stipules 0
 
    3. Inflorescences few–many in cyme-like clusters at branch tips; involucre glands 1–3, cup-shaped
 
      4. Leaves alternate below, opposite above; involucre, fruit glabrous; seed ovoid
E. dentata
      4' Leaves alternate throughout; involucre, fruit hairy; seed flattened
E. eriantha
    3' Inflorescence clusters umbel-like below, cyme-like above; involucre glands 4, ± flat
 
      5. Leaves opposite, 4-ranked; fruit > 8 mm
E. lathyris
      5' Leaves alternate; fruit < 6 mm
 
        6. Leaf margin finely toothed; gland margin entire or truncate
 
          7. Perennial; seed surface smooth or dotted
 
            8. Stem hairy; fruit tubercled
E. oblongata
            8' Stem glabrous; fruit smooth
E. serrata
          7' Annual; seed surface sculptured, net-like
 
            9. Fruit smooth — disturbed, waste places
E. helioscopia
            9' Fruit tubercled
E. spathulata
        6' Leaf margin entire; gland horned or scalloped
 
          10. Leaves linear, sometimes oblanceolate; seed surface smooth
E. esula
          10' Leaves obovate to ovate or elliptic; seed surface dotted or sculpture net-like
 
            11. Seed dotted; fruit 2-keeled on lobes — waste places, gardens
E. peplus
            11' Seed sculpture low, net-like; fruit lobes smooth
 
              12. Annual (rarely biennial); gland horns thin, > gland width
E. crenulata
              12' Perennial; gland horns thick, < gland width or 0
 
                13. Gland hornless, margin scalloped
E. incisa
                13' Gland 2-horned, margin entire to shallowly scalloped
E. palmeri


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