yo salbahe, philippine landrace probably came from the spaniards when they colonized it... apparently, the spaniards at that time used hemp ropes for their ships etc so they brought and planted seeds in most or if not all their colonies.
Taking into consideration the fact, that the oldest traces of cannabis cultivation can be traced to Taiwan, and the huge chinese impact on the whole area for millenia, the origin is certainly South East Asia, Probably China.