I'm pretty far from a scientist but from what I understand hemp is cannabis of any species that has been bread not for THC production but for fiber production, they want tall one main stemed plants with lots of space between the nodes. on top of that the plants are choped when the bds are just starting, before the fibers start hardening.
as for the different species of cannabis, alot of people deny them even existing. one of the main things that makes a species a species is that they cannot breed with eachother. they later changed this to they cannot reproduce and produce fertile offspring, sine tigers and lions can have babies and so can horses and mules.
from what I've read the only thing making cannabis sativa different from inidica is its growth pattern such as leaf structure plant size, flowering time and branch sructure. and how long they live.
this is just from what I've read I'm not 100% sure, but dont think anyone really is :P
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