The grass Tuctoria mucronata, which is known by several common names including prickly spiralgrass, Solano grass, and Crampton's tuctoria, is a federally listed endangered plant species endemic to two counties in northern California. It is a small annual, with stems growing decumbent against the ground to a maximum length of 12 cm, and turning upward at the tips. The leaves are 2-4 cm long, and secrete a sticky, aromatic juice. In the spring, the grass bears a small inflorescence 1.5-6 cm long, with numerous crowded spikelets.