I will finish this section on the naming of hybrids with one or two additional points on the correct method of writing their names. Here are the full names of three cultivated hybrids:-- _Rubus_ (_rusticanus inermis_ X _thyrsiger_) 'Merton Thornless.' _Camellia_ X _Williamsii_ 'Donation.' Rose (Hybrid Tea) 'Richmond.' The following points should be noted:-- (_a_) If a formula or a vernacular designation is used as a second part name, it should be placed in brackets between the generic name and the cultivar-name. (_b_) If a Latin name is used as a second part name, and the hybrid is between plants belonging to the same genus, a multiplication sign should be placed between it and the generic name. (_c_) The third part cultivar-name follows directly on the second part name and is placed in single quotes, as for cultivar-names of non-hybrids. In many contexts it would not be necessary to write the second part name at all, but if it is omitted, the cultivar-name, strictly speaking, should be preceded by a multiplication sign, thus: _Camellia_ X 'Donation,' but it would be no great crime to omit it, except perhaps in technical publications. 3. What Is the "Correct" Name for a Cultivar? It is a painfully familiar fact that many cultivars are known by more than one name, and that many cultivar-names have been applied to more than one cultivar--although the position is not so bad as it is in the case of botanical names! This multiplication of names is the inevitable result of many people naming many plants over a period of many years. It is a situation which we must accept and do our best to mitigate. The Code has a number of necessarily rather complicated provisions aiming at selecting the correct name for any cultivar. These provisions are important mainly to the comparatively few horticulturists and botanists who take on the unenviable job of sorting out the nomenclature of cultivated plants, though the results of their labours affect us all. The rules are set out fully in the Code, and here I will attempt only to pick out one or two of the more important. The Code lays down two basic principles; though, as we shall see, these may be modified if undesirable name-changing can be avoided thereby. (_a_) No name can be used if it does not conform to the various rules laid down in the Code (including proper publication of the name, with a description). (_b_) If there are two or more names that conform with the Code, then the _earliest_ name is the correct one; this is known technically as the principle of priority.