The Jepson Manual: Higher Plants of California

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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

Names are linked to treatments from the Manual


Key to ARTEMISIA

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

  1. Herbs, base sometimes woody; axillary leaf clusters generally 0
 
    2. Leaves generally entire, < 5 mm wide, anise- or tarragon-scented
A. dracunculus
    2' Some leaves lobed, generally > 5 mm wide; odor, if any, not anise- or tarragon-scented
 
      3. Rhizome present
 
4' Leaves generally 1–8 cm wide, ± glabrous above, glabrous or hairy below; stems 3–25 dm
 
  5. Lowest leaves 2-pinnately divided, lateral lobes acute; leaves generally glabrous above, tomentose (or becoming glabrous) below; strongly lemon-scented; subalpine to alpine
A. michauxiana
  5' Leaves entire to pinnately lobed, lateral lobes obtuse to acute, green and glabrous above, densely tomentose below; ± scented (not lemony); coastal and inland valleys
 
    6. Involucre bell-shaped, 2–4 mm diam; phyllaries gray-hairy, ovate; flowers > 15; leaves green to gray-green above
A. douglasiana
    6' Involucre narrow, < 2 mm diam; phyllaries yellowish, glabrous to sparsely hairy, oblong to ± ovate; flowers < 15; leaves dark green above
A. suksdorfii
      4. Leaves generally < 1 cm wide, densely gray-hairy (or becoming ± glabrous above); stems generally < 8 dm
A. ludoviciana
        7. Inflorescence open; leaves generally 1–2 cm
subsp. albula
        7' Inflorescence narrow; leaves generally 2–11 cm
 
          8. Leaves entire to toothed or shallowly lobed
subsp. ludoviciana
          8' Leaves deeply 1–2-divided into narrow lobes
 
            9. Involucre 4–5 mm, 4–7 mm diam; leaves white-tomentose
subsp. candicans
            9' Involucre 2.5–3.5 mm, 2–3.5 mm diam; leaves upper surface often green
subsp. incompta
      3' Rhizome 0
 
        10. Stem glabrous, simple, basal leaves 0
 
          11. Perennial; stem wand-like, > 8 dm; leaves coarsely lobed; receptacle chaffy — s South Coast, Peninsular Ranges
A. palmeri
          11' Annual or biennial; stem erect, < 8 dm; leaves finely divided; receptacle naked
 
            12. Heads nodding; annual, aromatic; leaves 2–3-pinnately divided
A. annua
            12' Heads erect; biennial, unscented; leaves 2-pinnately divided
A. biennis
        10' Stem hairy, branched from base, from basal leaf cluster
 
          13. Leaves densely hairy; phyllaries densely gray-hairy, margins widely scarious; coastal
A. pycnocephala
          13' Leaves glabrous or ± hairy; phyllaries sparsely hairy, margins dark or scarious; montane
 
            14. Biennial or perennial herb from taproot; inflorescence narrow, spike-like, phyllary margins scarious
A. campestris subsp. borealis
            14' Perennial from branched caudex; inflorescence open, phyllary margins black
A. norvegica subsp. saxatilis
  1' Subshrubs or shrubs; axillary leaf clusters present
 
    15. Plant spiny, compact (hairy); inflorescence short, heads ± hidden by leaves; leaves palmately 3–5-divided; flower spring/early summer
A. spinescens
    15' Plant unarmed, compact to tall; inflorescence long, stalked, generally ± exceeding leaves, heads not hidden; leaf lobes 0–5; flowering late summer/autumn
 
      16. Leaves generally > 2 cm, linear, often ± thread-like or lobes < 3 mm wide, generally > 1 cm
 
        17. Plant 6–18 dm; leaf segments generally < 1 mm wide, margins curled under; mainland, some Channel Islands
A. californica
        17' Plant generally < 6 dm; leaf segments 1–3 mm wide, flat; s Channel Islands
A. nesiotica
      16' Leaves generally < 2 cm, oblong or wedge-shaped, generally > 3 mm wide, entire to shallowly 3-lobed at tip, lobes < 1 cm
 
        18. Heads nodding; leaves not clustered, entire or teeth 3, sharply pointed — White and Inyo Mountains, Mojave Desert
A. bigelovii
        18' Heads erect; leaves often in axillary clusters, entire or teeth 3, rounded to acute
 
          19. Leaves generally linear, entire, winter-deciduous; heads generally > 5 mm wide
A. cana subsp. bolanderi
          19' Leaves generally wedge-shaped, 3-toothed, persistent in winter; heads generally < 5 mm wide
 
            20. Plant generally < 4 dm; inflorescence narrow, generally < 3 cm wide
 
              21. Shrub with evident trunk at base
A. tridentata subsp. wyomingensis
              21' Shrub branched at base, trunk not evident
 
                22. Leaves of flower-stems entire; heads < 3 mm diam, solitary on slender peduncle; phyllaries shiny-resinous, straw-colored
A. nova
                22' Leaves of flower-stems lobed; heads generally > 3 mm diam, sessile, 2–4 per cluster; phyllaries gray-hairy
A. arbuscula
                  23. Leaves of flower-stem shallowly lobed; heads 3–4 mm diam
subsp. arbuscula
                  23' Leaves of flower-stem deeply lobed; heads 2–3 mm diam
subsp. thermopola
            20' Plant generally > 4 dm; inflorescence > 3 cm wide
 
              24. Plant sticky-resinous; heads > 3 mm diam; meadows, c&s High Sierra Nevada, San Gabriel Mountains, San Bernardino Mountains
A. rothrockii
              24' Plant not sticky; heads generally < 3 mm diam (4.5–6 mm in A. spiciformis); widespread in mtns, dry valleys
 
                25. Leaves entire to irregularly 3–6-lobed, partly deciduous; plant sprouting from roots; high mtn meadows
A. spiciformis
                25' Leaves generally regularly 3-lobed, wedge-shaped, evergreen; plant not root-sprouting; widespread
A. tridentata
                  26. Inflorescence narrow, branches generally erect
subsp. vaseyana
                  26' Inflorescence wide, branches erect to spreading or drooping
 
                    27. Inflorescence branches drooping; fruit hairy
subsp. parishii
                    27' Inflorescence branches erect to spreading; fruit glandular
subsp. tridentata


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