Such a funny word for what amounts to a "local cultivar". "Native" is not a proper way to describe these, as in most cases, the species is not "native" to the area.
However, a landrace is simply a species which has been adapted to the local environment. This can be accomplished via open pollination methods, where selections are made for the best plant(s) year after year.
A good example of landraces in tomatoes comes from Joseph Lofthouse, who has been selecting for his mountain environment for years now and has developed some impressive genetics that outperform just about any hybrid he has tried to grow!
However, a landrace is simply a species which has been adapted to the local environment. This can be accomplished via open pollination methods, where selections are made for the best plant(s) year after year.
A good example of landraces in tomatoes comes from Joseph Lofthouse, who has been selecting for his mountain environment for years now and has developed some impressive genetics that outperform just about any hybrid he has tried to grow!