Helenium amarum
© 2007 Josh
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Conoclinium coelestinum
© 2007 Josh
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Symphyotrichum drummondii
© 2007 Josh
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Tagetes lucida
© 2007 Josh
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Conoclinium greggii
© 2007 Josh
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Bidens laevis
© 2007 Josh
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Berlandiera lyrata
© 2007 Josh
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Heterotheca stenophylla
© 2007 Josh
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Berlandiera betonicifolia
© 2008 Josh
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Calyptocarpus vialis
© 2008 Josh
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Rojasianthe superba
© 2006 Eric in SF
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Rojasianthe superba
© 2006 Eric in SF
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Rojasianthe superba
© 2006 Eric in SF
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Geraea canescens and Phacelia calthifolia
© 2005 Dawn Endico
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Montanoa grandiflora
© 2005 Eric in SF
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Rudbeckia nitida
© 2005 Gertrud K.
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Liatris spicata
© 2006 Gertrud K.
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Symphyotrichum ericoides
© 2005 Gertrud K.
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Achillea millefolium
© 2005 Gertrud K.
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Psathyrotes ramosissima
© 2005 Dawn Endico
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Dahlia imperialis
© 2005 Eric in SF
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Felicia amelloides
© 2006 Gertrud K.
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Malacothrix glabrata
© 2005 Dawn Endico
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Helianthus annuus
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Urmenetea atacamensis
© 2008 Jose L. Panero
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Mutisia subulata
© 2008 Jose L. Panero
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Capitulum cross section diagram
© Jose L. Panero
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Artemisia campestris
© Mary Ellen (Mel) Harte
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Artemisia campestris
© 2006 gwarcita
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Artemisia campestris
© 2006 gwarcita
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Bidens coronata
© 2005 Anita Gould
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Espeletiopsis corymbosa
© 2006 Andreas Philipp
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Tripleurospermum perforata
© 2005 Gertrud K.
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Mutisia sp.
© 2006 Eric in SF
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Carduus nutans
© 2007 Les
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Argyrophenga antipodum and Cirsium arvense
© 2008 Jon Sullivan
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Senecio confusus
© 2007 Dinesh Valke
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Ambrosia trifida
© Ted Bodner, Southern Weed Science Society, United States
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Ambrosia trifida
© 2005 zen Sutherland
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Echinacea angustifolia
© 2003 gwarcita
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