coronilla

1a capitalized :  a genus of Old World often woody herbs (family Leguminosae) having purple, pink, or yellow flowers in long-stalked axillary heads or umbels — see axseed scorpion senna b plural -s :  any plant of the genus Coronilla

2 less commonly coronillo \-nē(ˌ)(y)ō\ -s [American Spanish coronilla, coronillo, from Spanish coronilla crown of the head, diminutive of corona crown, from Latin] :  a valuable timber tree (Gleditsia amorphoides) of Argentina the bark of which yields a saponin