Given the task definition and input, reply with output. In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

There are three species : " Cannabis sativa " , " Cannabis indica " , and " Cannabis ruderalis " .

Three species may be recognized : " Cannabis sativa " , " Cannabis indica " , and " Cannabis ruderalis " ; " C. ruderalis " may be included within " C. sativa " ; all three may be treated as subspecies of a single species , " C. sativa " ; or " C. sativa " may be accepted as a single undivided species .