Thepaperswhichonthissubjectprecededandcontributedto’FormsofFlowers’werethefollowing:——
\"OnthetwoFormsorDimorphicConditionintheSpeciesofPrimula，andontheirremarkableSexualRelations。\"Linn。Soc。Journal，1862。）
\"OntheExistenceofTwoForms，andontheirReciprocalSexualRelations，inseveralSpeciesoftheGenusLinum。\"Linn。Soc。Journal，1863。
\"OntheSexualRelationsoftheThreeFormsofLythrumsalicaria，\"Ibid。
1864。