abc ...
When naturally-occurring, plants of alluvial soils; otherwise, escaped from cultivation or introduced.  Flowers July to September.  Native.  Varieties include var. helianthoides and var. scabra..

Perennial.  Colony-forming from rhizomes.  Typical height is from 4 to 5 feet.

Inflorescences are   

Flower heads are radiate.  Ray florets are yellow, pistillate and fertile.  Disc florets are yellow, bisexual and fertile.

Basal leaves

 

.

Similar species:  Helianthus decapetalus.

 

.

 

 

.


Images and text copyright  botphoto.com  and Arieh Tal, 1990 to 2016.  All rights reserved.  ( Terms of use )
.