Mentzelia laevicaulis is a showy wildflower native to western North America. In California it is found in most counties throughout the state. Its common names include Giant Blazing Star and Smoothstem Blazing Star. It grows a weedy-looking, branched stem which may reach a meter in height. The whitish-green stem and its lateral branches bear the occasional triangular sawtoothed leaf. At the tip of each branch blooms a spectacular yellow flower. The star-shaped flower has five narrow, pointed petals with shiny yellow surfaces, each up to 8 centimeters long. Between the petals are long, thin yellow sepals. The center of the open-faced flower is filled with a great many whiskery yellow stamens. Beneath the petals are long, curling leaves. The plant bears capsule fruits containing winged seeds. This is a widespread plant which can be found in sandy, rocky, and disturbed areas, such as roadsides.