What is the resinous form of marijuana?

There are 3 species of cannabis. Cannabis Sativa, Cannabis Indica, and Cannabis Ruderalis. Smokable marijuana today is the result of years of cross breeding ideal traits between generations of indica and sativa strains. Sativa produces a more of a head high, and Indica producing the body high. Most pot going around is a healthy mixture of the two, but it really all depend on if you want to be all sleepy and stoney or all clear headed and creative.