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]