sentence: In the secondary heads of Echinops and Pycnosurus ( both Asteraceae ; Cla ß en-Bockhoff , 2016 ) , the compound umbels of Apiaceae ( Cla ß en-Bockhoff and Bull-Here ñ u , 2013 , unpublished data ) and the secondary heads of some Eriocaulaceae ( St ü tzel and Trov ó , 2013 ) , floral organs are only formed after a second step of fractionation.It should not be concealed that the inflorescences of some Urticaceae ( Dorstenia ) and Moraceae ( Elatostema sessilis , Procris frutescens ) show a high developmental similarity to Ricinus ( Bernbeck , 1932 ) .