Tulsi (Holy Basil) Type Comparisons

How does one disambiguate a subject so complex?  Holy Basil, a plant that is gentle and healing to body, mind and spirit should bring happiness, not confusion! The commonality of all types (species/cultivars) is that the leaves may be eaten fresh, used in cooking, or best yet picked, dried, and made into tea. Taxonomy:  Vana Tulsi (a tree basil) is Ocimum gratissimum.  The …