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.

bullet

Maximilianii Characteristics
bullet

stem conspicuously pubescent below the inflorescence with short white hairs

bullet

involucre bracts narrow, mostly with loose acuminate tips

bullet

involucre bracts covered with short white hairs, sometimes ciliate toward the base

bullet

disk yellow or light brown

bullet

receptacle convex or low conical

 

bullet

Helianthus Characteristics
bullet

receptacle flat or convex, not conic or columnar

bullet

receptacle with chaffy scales between the florets

bullet

flower heads with both tubular and ray florets

bullet

rays conspicuous

bullet

ray florets yellow