Lophophora williamsii var. diffusa (Croizat) Rowley 1979
Lophophora diffusa var. koehresii Riha 1996,
Lophophora williamsii var. koehresii (Riha) Grym 1997
Lophophora diffusa subsp. viridescens Halda 1997,
Lophophora viridescens (Halda) Halda 1997
Lophophora diffusa var. fricii Halda 1997
Lophophora diffusa var. kubesai Halda, Kupcak et Malina
Lophophora diffusa var. swobodaiana Halda, Kupcak et Malina
Lophophora ziegleri Werdermann
Lophophora ziegleriana Soulaire
Lophophora diffusa, commonly known as false peyote, is a species of plant in the Cactaceae family and one of the only two species in the Lophophoragenus. It is endemic to Mexico in the outskirts of Querétaro. This species contains zero to trace amounts of mescaline; pellotine is the principal alkaloid. The species name diffusa refers to the flat tubercles that are outspread without the plant having prominent ribs.
The plants are yellow-green, usually lacking well-defined ribs and furrows. The podaria are rarely elevated, but are broad and flat. The tufts of hair are usually spread unequally on the prominent podaria. The flowers are commonly whitish to yellowish-white.