The broom snakeweed (Gutierrezia sarothrae) belongs to Asteraceae (the Aster family). It is an evergreen shrub that is native to much of the western half of North America, from western Canada to northern Mexico. This shrub grows in a number of arid, grassland, and mountain habitats, and up to a height of 20-100 cm. The stems are green to brown, bushy, and branch upwards from a woody base. The leaves are alternate and linear, and 5-60 mm long and 1-3 mm wide. The lower leaves are usually shed before the plant flowers. The small, yellow flower-heads bloom in clusters at the end of the stems from July to September. The cluster has 6-14 flower-heads, each with 2-8 ray flowers and 2-9 disk flowers.