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 ISOCOMA

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

  1. Phyllaries oblong, tips blunt to rounded, green < 1/4 total length of phyllary, often swollen and wart-like
I. acradenia
    2. Leaves conspicuously reduced upward, grading into bracts below heads, these grading into phyllaries; flowers 10–17
var. bracteosa
    2' Leaves uniform throughout, or only slightly reduced upward, not grading into bracts below heads; flowers 6–14
 
      3. Leaves narrowly oblanceolate, entire; involucres 4–5 mm
var. acradenia
      3' Leaves narrowly obovate, with long-tapering base, to obovate, with 4–6 teeth per side; involucres 5–7 mm
var. eremophila
  1' Phyllaries lanceolate, tips acute to acuminate, green 1/3–1/2 total length of phyllary, flat
 
    4. Involucres 4.5–7 mm, 2.5–5 mm diam; upper stems yellow-white
I. arguta
    4' Involucres 8–10 mm, 5–8 mm diam; upper stems gray, green, tan, or red
I. menziesii
      5. Plant prostrate; leaves widely obovate with a long-tapering base, margins toothed, fleshy; exposed areas on beaches, dunes, sea-cliffs
var. sedoides
      5' Plant decumbent to erect; leaves linear, (ob)ovate or narrowly spoon-shaped, not fleshy; inland, or protected areas on coast
 
        6. Stems scabrous to tomentose; leaves generally not clustered in axils, green to gray-green, not closely spaced; stem readily visible
var. menziesii
        6' Stems glabrous to scabrous; leaves clustered, dark green, often so closely spaced that the stem is obscured
var. vernonioides


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