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First report of fasciation in Pitcher's Thistle, Cirsium pitcheri (Asteraceae)

January 1, 2013

We document the first reported occurrence of fasciation in the federally threatened Pitcher’s thistle, Cirsium pitcheri (Asteraceae). In 2013, we discovered two adult plants of Pitcher’s thistle out of a total of 176 plants at West Beach, near Miller, Indiana, USA, that exhibited both normal and fasciated growth. Unlike plants with normal growth, a portion of the upper stems of these plants was flattened, and some flower heads were elongated into a fan-like shape. Each plant had one large fasciated terminal seed head and several less severely fasciated ancillary heads. The fasciated terminal head on one of the plants found produced an estimated 1153 seeds, whereas normal terminal heads typically produced 80 ± 9 viable seeds. The cause of this fasciation is unclear, but may be due to infection with phytoplasma

Publication Year 2013
Title First report of fasciation in Pitcher's Thistle, Cirsium pitcheri (Asteraceae)
Authors Noel B. Pavlovic, Megan K Korte, Kathryn McEachern, Ralph Grundel
Publication Type Article
Publication Subtype Journal Article
Series Title The Michigan Botanist
Index ID 70162099
Record Source USGS Publications Warehouse
USGS Organization Great Lakes Science Center