These would would be an example of different forms or varieties. These are sometimes abbreviated cv. Examples are variegations, growth forms, foliage or flower color, etc. Continued reproduction may require the same crossing technique as rarely do seed produced from a mature plant created by hybridization or from a cultivar reproduce the same desired characteristic. Hybrid crosses are readily done among plants of the same species and rarely between plants of different genera.
Latinized names have genders which are expressed in the last syllable.
The species, an adjective, must agree with the gender of the noun genus. If the cultivar is named after someone or a place which is normally capitalized, the cultivar name is also capitalized. A list of some of the commonly used names When you see the botanical names of plants and related cultivars, often the Latin derived name is descriptive of their ornamental features. In addition, there are standard terminologies for branching forms, leaf types, inflorescence, etc. Often these are used in species or cultivar names to describe the unique plant characteristic.