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Asteraceae

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Verbesina helianthoides Michx.

Gordon C. Tucker
Verbesina L.

Gordon C. Tucker
Verbesina occidentalis (L.) Walter

Wayne Longbottom
Vernonia gigantea Trel., Branner & Coville

Matthew Brooks
Vernonia gigantea Trel., Branner & Coville

Hiram F. Thut
Vernonia gigantea Trel., Branner & Coville

Gordon C. Tucker
Vernonia gigantea Trel., Branner & Coville

Gordon C. Tucker
Vernonia gigantea Trel., Branner & Coville

Gordon C. Tucker
Vernonia gigantea Trel., Branner & Coville

Gordon C. Tucker
Vernonia gigantea Trel., Branner & Coville

Gordon C. Tucker
Vernonia gigantea Trel., Branner & Coville

Jennifer Ward
Vernonia missurica Raf.

Bart Moore
Vernonia missurica Raf.

N. L. Owens
Vernonia missurica Raf.

Gordon C. Tucker
Vernonia noveboracensis (L.) Michx.

Gordon C. Tucker
Vernonia noveboracensis (L.) Michx.

Tad M. Zebryk
Vittadinia gracilis (Hook. f.) N.T. Burb.

K. D. Hill
Xanthium strumarium L.

Eileen Adler
Xanthium strumarium L.

Jason Cunningham
Xanthium strumarium L.

Hiram F. Thut
Xanthium strumarium L.

Gordon C. Tucker
Xanthium strumarium L.

Gordon C. Tucker
Xanthium strumarium L.

Gordon C. Tucker and Aquatic Plants Class
Youngia japonica DC.

Gordon C. Tucker