Gumweed (Grindelia squarrosa
) is an erect annual, biennial or short-live perennial flowering herb that is a member of the sunflower family (Asteraceae). It is native to western and southwestern North America. G. squarrosa
has alternate leaves with gland-dotted, toothed edges and gummy appearance. It produces numerous yellow flowers. G. squarrosa
utilizes a deep taproot and an extensive shallow root system.
is able to absorb high levels of selenium in certain soils, which can cause selenium toxicity
. Most horses avoid the plant, however if there is little else to eat horses may consume the plant from hunger.