'pin clover' definitions:

European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage [syn: redstem storksbill, alfilaria, alfileria, filaree, filaria, clocks, pin grass, pin clover, Erodium cicutarium]