Mescaline is obtained from
Mescaline is a psychedelic drug. It is also known as 3,4,5-trimethoxyphenethylamine. It is a naturally occurring hallucinogenic drug obtained from spineless cactus Lophophora williamsi. It is synthesised from tyrosine in this cactus plant. It is used for the treatment of depression and alcoholism. Its effects include euphoria, dream like state, laughter and pupil dilation. So, the correct answer is 'Lophophora'.