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Asteraceae

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Parthenium integrifolium L.

Gordon C. Tucker
Parthenium integrifolium L.

Gordon C. Tucker
Parthenium integrifolium L.

Jennifer Ward
Parthenium integrifolium L.

Jennifer Ward
Petasites frigidus (L.) Fr.

William James Cody
Petasites palmatus (Aiton) A. Gray

Jan Looman
Picris angustifolia subsp. angustifolia DC.

R. G. Coveny
Pluchea camphorata (L.) Dc.

Gordon C. Tucker
Polymnia canadensis L.

Loy R. Phillippe and William C. Handel
Prenanthes alba L.

Gordon C. Tucker and Daniel M. Tucker
Prenanthes altissima Pall.

Hiram F. Thut
Prenanthes aspera Michx.

N. L. Owens
Prenanthes crepidinea Michx.

Loy R. Phillippe
Prenanthes trifoliolata (Cass.) Fernald

Tad M. Zebryk
Pyrrhopappus carolinianus DC.

Gordon C. Tucker
Pyrrhopappus carolinianus DC.

Gordon C. Tucker
Pyrrhopappus carolinianus DC.

Gordon C. Tucker
Ratibida pinnata Barnhart

Brian Garrard
Ratibida pinnata Barnhart

Gordon C. Tucker
Ratibida pinnata Barnhart

Gordon C. Tucker
Ratibida pinnata Barnhart

Gordon C. Tucker
Ratibida pinnata Barnhart

Gordon C. Tucker
Ratibida pinnata Barnhart

Gordon C. Tucker
Rudbeckia amplexicaulis Vahl

Gordon C. Tucker
Rudbeckia fulgida var. sullivantii (C.L.Boynton & Beadle) Cronquist

Jason Haas