(1) If the parentage is known, a bare _formula_ consisting of the names of the parents, in alphabetical order, connected with a multiplication sign, _e.g._ _Lewisia cotyledon_ x _rediviva_. (2) A name in Latin form (corresponding to a non-hybrid specific epithet), preceded by a multiplication sign, _e.g._ _Viburnum_ x _bodnantense_. (3) A vernacular phrase containing the word "hybrid," "cross," "grex" (Latin for flock or group), or other similar word, making evident the collective nature of the phrase, _e.g._ _Lilium_ 'Bellingham Hybrids.' Why do we have to have these three different forms for the second part of the full name, and when, to put it briefly, should we use which? I must admit that practice on this particular point is as yet by no means fixed, and no doubt it will be modified considerably during the next few years, as more horticulturists try to apply the Code to the groups in which they are interested. In order to understand the alternatives available, it will be helpful, I think, to consider first the _third part_ of the full name, as the use of this, and of the second part, are very closely connected. The third part, as I have said, is a cultivar-name of a particular form of the hybrid concerned, and, in the first place, it is extremely important to realize that _every cultivated hybrid that is considered worth naming at all should receive a cultivar-name from the outset of its "career," even_ _if, at the time, only one form is known, or is considered worth naming._ To take an actual example, at the time when the new hybrid _Viburnum_ x _bodnantense_ was described in the _Botanical Magazine_, only one form, or clone, of it had been "put into circulation," and yet that single clone was given a cultivar-name, 'Dawn.' The object of doing this was to be able, in the future, to refer by name to this particular clone and so avoid confusion with any later, and possibly inferior, forms of the same cross that might be produced. In the absence of the name 'Dawn,' less desirable clones could legitimately be passed off under the collective name _V_. x _bodnantense_ without the acquirer realising that he was not getting the original and superior form.