Ruderalis, the third and perhaps least known of the cannabis sativa subspecies. It is commonly refered to as feral cannabis, as it is most commonly the result of hemp plants that eventually adapted to their environment. It is autoflowering, meaning it doesn't need a change in light cycle to triger flowering. After a few weeks it will go straight from the vegetative state to the flowering state under existing light conditions (even constant, high intensity light). This means that strains that have ruderalis in their gene pool are more likely to autoflower. Most lowryder/autoflowering dwarf strains will do this with nearly 100% flowering within a few weeks of germination. However, occasionally, because they have been bred with other, light sensitive strains, not every single plant will autoflower.
Ruderalis strains, while not as smooth or as sweet as other strains, still produces a significant high, somewhere between average middies and low headies. However, due to the subspecies recent introduction into breeding, the highs can be erradic, varying drastically from plant to plant, as no consistent, autoflowering, standardized strains have been fully developed. It is a good option for causal growers, or anyone who doesn't like to wait months for their product. I wouldn't be surprised to see more autoflowering dwarves in the years to come.