YELLOW FOXTAIL, Setaria lutescens (Weigel) Hubb. 1, entire plant; 2, seeds. Annual, reproducing by seeds. Stems erect, 1 to 2 feet (30 to 60 cm) tail. Leaves flat, often having a spiral twist, with many long hairs on the upper surface near the base. Panicle dense, erect. Spikelets with 5 or more bristles. Seed about 1/12 inch (2 mm) long, mostly yellowish but some dark brown. Found in all places except woods. A serious weed. Also commonly known as pigeon grass.