yellow `perennial rocket` flowers - sisymbrium strictissimum

altissimum arboretum bloom blossom botanical botany brassicaceae bunch cheirinia cluster crucifera cuisine east europe european flora flower gallen garden green head herb juncea leaf meadow medicine mustard natural nature norta perennial petal plant rauke rocket saint sisymbrium spice steife strictissima strictissimum swiss switzerland top wildflower yellow