Such characters are not of course of specific value, but they are, as Asa Gray has remarked in commenting on this memoir, such as generally enter into specific definitions.
Ezaugarri hauek, jakina, ez dute espezie-baliorik; baina, Asa Gray-k txosten honen iruzkina egitean ohartarazi duen legez, horiek espezieen definizioan eskuarki sartzen direnen modukoak dira.