Helianthus maximilianii

Narrow-leaved Sunflower

Southeast of Sedley
30-August-2002

I have found that neither flora easily distinguishes between Helianthus and Rudbeckia (Rudbeckia hirta is Black-eyed Susan) in their keys.  However, they do note that the receptacles of Rudbeckia are more conic.

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Maximilianii Characteristics
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disk yellow or light brown

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receptacle convex or low conical

 

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Helianthus Characteristics
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receptacle flat or convex, not conic or columnar

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receptacle with chaffy scales between the florets

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flower heads with both tubular and ray florets

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rays conspicuous

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ray florets yellow