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    THIS PAGE IS NO LONGER UPDATED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 EQUISETUM

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

  1. Stem regularly branched
 
    2. Basal internode of branch > subtending nodal sheath
2 E. arvense
    2' Basal internode of branch < subtending nodal sheath
 
      3. Sheath teeth 5–10
2 E. palustre
      3' Sheath teeth 14–28 on sterile stem, 20–30 on fertile stem
2 E. telmateia subsp. braunii
  1' Stem unbranched or branches scattered
 
    4. Stem brown, fleshy, lasting < 1 month irregularly in spring
 
      5. Sheath teeth 6–14 on sterile stem, 6–10 on fertile stem
2 E. arvense
      5' Sheath teeth 14–28 on sterile stem, 20–30 on fertile stem
2 E. telmateia subsp. braunii
    4' Stem green, firm, lasting > 1 month
 
      6. Sheath teeth 5–10, persistent
2 E. palustre
      6' Sheath teeth 10–50, generally deciduous
 
        7. Cone tip pointed; sheath generally with 2 dark bands, 1 at base, 1 at tip; stem perennial herb, generally scabrous
E. hyemale subsp. affine
        7' Cone tip rounded; sheath generally with 1 dark band, at tip; stem annual (or perennial herb in s), generally not scabrous
E. laevigatum


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