20 LAWS OF NOMENCLATURE. 



Subspecies (vel Proles, Angl. Race.) 

 Yarietas. 

 Subvarietas. 

 Variatio. 

 Subvariatio. 

 Planta. 



Art. 11. Tbe definition of each of tbese names of 

 groups may vary, in a certain degree, according to in- 

 dividual opinion and tbe state of science, but tbeir 

 relative rank, sanctioned by custom, must not be in- 

 verted. Any classification containing inversions, sucb 

 as tbe division of genera into Orders, or of species into 

 genera, is inadmissible. 



Art. 12. Tbe fertilization of one species by another 

 gives rise to a hybrid Qiyhridus) ; that of a modifi- 

 cation or subdivision of a species by another modi- 

 fication of the same species produces a half-breed 

 [mistus, mule of florists). 



Art. 13. The arrangement of species in a genus or 

 in a subdivision is made by means of typographical 

 signs, letters, or figures. Hybrids are classed after 

 one of the species from which they originate, with the 

 sign X prefixed to the generic name. 



The rank of subspecies under species is marked by 

 letters or figures; that of varieties by the series of 

 Greek letters a, yS, 7, etc. Groups below varieties and 

 half-breeds (mule of florists) are indicated by letters, 

 figures or typographical signs, according to the will of 

 the author. 



Art. 14. Modifications of cultivated species should, 

 where possible, be classed under the wild or spon- 

 taneous species from which they are derived. 



