Setaria parviflora
yellow bristlegrass, knotroot foxtail

Native to Florida

This common small grass might first be noticed by its shortish bristly inflorescences at the tops of several stems above erect leaves. Yellow bristlegrass may occur as a single plant or as a significant colony. It may be short, less than 1 ft., or up to 2 ft. tall.


It is common nearly throughout Florida (Wunderlin, 1998). There are about 32 species of Setaria in the U.S.; about 1/3 of them are non-native plants. Except for the north central states, this species is native throughout the U.S. (Kartesz, 1999).

Yellow bristlegrass is a grass. stems erect or leaning, 14-28 in. tall; leaf blades flat, mostly erect, to 2 ft. long; inflorescence cylindrical, bristly, to 3 in. long, to 3/4 in. wide, on stem tips; 4 to 7 long bristles stick out from around each spikelet

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