For instance, Mr. H.C. Watson has marked for me in the well-sifted London catalogue of Plants (4th edition) sixty-three plants which are therein ranked as species, but which he considers as so closely allied to other species as to be of doubtful value:
H.C. Watson jaunak ongi oinarrituriko London Catalogue of plants-en (4. edizioa) 63 landare seinalatu dizkit, espezietzat sailkaturik agertzen direnak, baina berak beste landare batzuen antz-antzekotzat dauzka, eta horregatik dudazko baliokoak dira;