Inter-generic hybrids are formally identified with a cross symbol prefixing their name. This symbol looks like a small letter �x�. Before the advent of UNICODE, this symbol was not present in most computer fonts, thus the common practice was to substitute the cross symbol for with the lower case letter �x�. This convention allows for easy entry of these names and has been adopted by The Compleat Botanica.

Note that the first letter of a species names is always capitalized (this is automatically done for you by the software). In the case of inter-generic hybrids the �x� is not considered to be the first letter.