Abstract
Abstract Taxonomists describe panicles of green and yellow foxtail (Setaria viridis (L.) and S. glauca (L.) Beauv., respectively) as dense, contracted, narrow and cylindrical. However, a 6-y survey near Hays, Kansas documented inflorescences of green and yellow foxtail that were divided into two to four or more elongated segments. Those panicles were forked or digitate rather than a single compact cylinder. Anomalous panicles were always found on plants having several normal heads. Branched morphology was infrequent (<1 head in 10,000), but was observed in 1993 and 1995–1998. Before 1998 Kansas collections of foxtail specimens with abnormal panicles were limited to a 1600 × 3200 m area in central Ellis County. Observations during 1998 increased the known geographic distribution in Kansas to a 3200 × 3600 m area. Seed collected from branched panicles of both species and grown in greenhouse conditions did not produce plants with any aberrant inflorescences. Occurrence of deviant green or yellow foxtail pani...
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