Cannabis ruderalis is a low-THC species of Cannabis which is native to Central and Eastern Europe and Russia. It is widely debated as to whether or not ruderalis is a sub-species of Cannabis sativa. Many scholars accept Cannabis ruderalis as its own species due to its unique traits and phenotypes which distinguish it from Cannabis indica and Cannabis sativa.
Source: Cannabis ruderalis - Wikipedia
hfn editors note: cannabis ruderalis is also used extensively in cross breeding.
Ogre comes to mind among others: OGRE is the largest Auto-Flowering strain from our U.S. breeding partner, SGS. It is a sativa-dominant cross of Secret Citrus x Durban Skunk. OGRE shows a unique accelerated growth pattern not seen in Auto-Flowering strains, this allows OGRE to get very large, averaging 1m+ tall and wide. With a prolific branching system OGRE produces very large yields with oversized aromatic buds. The amount of growth and yields produced in so little time makes OGRE one of the fastest high yielding plants in the world.