The infertility which may be observed in various dimorphic and trimorphic plants, when they are illegitimately fertilised, that is by pollen taken from stamens not corresponding in height with the pistil, differs much in degree, up to absolute and utter sterility; just in the same manner as occurs in crossing distinct species.
Hainbat landare dimorfo eta trimorfotan ikus daitekeen antzutasuna, landareok ezlegetasunez ernalarazten direnean, hau da, pistiloari ez dagokion altueratik harturiko polenaz, maila ezberdinekoa da, erabateko antzutasun absoluturaino irits daitekeelarik, espezie ezberdinak gurutzatzean gertatzen den bezalaxe.