Does anyone have some guidance to offer on using #hashtags with #BinomialNomenclature? What should I prefer: a single hashtag of #GenusSpecies, two separate hashtags for #Genus and #species, or something else?

Continuing down this path, what should I consider when writing a hashtag indicating a selected form like Rhododendron davidsonianum 'Ruth Lyons' or indicating the epitaph refers to a hybrid such as Rhododendron 'Unique'?