Helianthus giganteus L.
Family: Asteraceae
giant sunflower,  more...
[Helianthus alienus E.Watson,  more]
Helianthus giganteus image
Merel R. Black  
Etymology: Helianthus: derived from two Greek words helios, "sun," and anthos, "flower," in reference to the sunflower's supposed tendency to always turn toward the sun
Plants: erect, perennial, 3'-10' tall forb; stems usually with spreading hairs but sometimes hairless, often purplish
Leaves: opposite on the lower stem, upper alternate, flat, narrow, at least 3 times as long as wide, upper surface rough, lower with long hairsleaf drawing
Flowers: head 1 3/4"- 3 1/4" wide with 10-20 yellow rays, yellow disks, hairy bracts (phyllaries) long and loose; inflorescence in loose clusters of several to many heads on stalks less than 4" long; blooms July-Oct.
Habitat: moist; forests, swamps
Helianthus giganteus image
Merel R. Black  
Helianthus giganteus image
Merel R. Black  
Helianthus giganteus image
Janice Stiefel  
Helianthus giganteus image
Matthew L. Wagner  
Helianthus giganteus image
Matthew L. Wagner  
Helianthus giganteus image
Janice Stiefel  
Helianthus giganteus image
Helianthus giganteus image
Kenneth J. Sytsma  
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Christopher Noll  
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Robert Bierman  
Helianthus giganteus image
Matthew L. Wagner  
Helianthus giganteus image
Merel R. Black  
Helianthus giganteus image
Merel R. Black  
Helianthus giganteus image
Matthew L. Wagner  
Helianthus giganteus image
Matthew L. Wagner  
Helianthus giganteus image
Helianthus giganteus image
Caroline A. Creevey  
Helianthus giganteus image
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Aaron_Carlson  
Helianthus giganteus image
Aaron Carlson  
Helianthus giganteus image
Helianthus giganteus image
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Helianthus giganteus image
Helianthus giganteus image
Aaron Carlson  
Helianthus giganteus image
Helianthus giganteus image
Helianthus giganteus image
Helianthus giganteus image
Helianthus giganteus image
Aaron_Carlson  
Helianthus giganteus image
Aaron Carlson  
Helianthus giganteus image
Helianthus giganteus image
Helianthus giganteus image
Helianthus giganteus image
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