From The Collaborative International Dictionary of English v.0.48 :
clocks \clocks\ n. 1. European weed naturalized in the southwestern U. S. and Mexico ({Erodium cicutarium), having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender pinlike fruits that stick straight up; it is often grown for forage. Syn: redstem storksbill, alfilaria, alfileria, filaree, filaria, pin grass, pin clover, Erodium cicutarium. [WordNet 1.5]