text: When the ritual of somayajna is held today in South India by the traditional Srautas called Somayajis, the plant used is the somalatha (Sanskrit: soma creeper, Sarcostemma acidum) which is procured as a leafless vine.
  Since the late 18th century, when Abraham Hyacinthe Anquetil-Duperron and others made portions of the Avesta available to western scholars, several scholars have sought a representative botanical equivalent of the haoma as described in the texts and as used in living Zoroastrian practice. In the late 19th century, the highly conservative Zoroastrians of Yazd (Iran) were found to use ephedra, which was locally known as hum or homa and which they exported to the Indian Zoroastrians.
  During the colonial British era scholarship, cannabis was proposed as the soma candidate by Jogesh Chandra Ray, The Soma Plant (1939) and by B. L. Mukherjee (1921).
  In the late 1960s, several studies attempted to establish soma as a psychoactive substance. A number of proposals were made, including one in 1968 by the American banker R. Gordon Wasson, an amateur ethnomycologist, who asserted that soma was an inebriant but not cannabis, and suggested fly-agaric mushroom, Amanita muscaria, as the likely candidate. Since its introduction in 1968, this theory has gained both detractors and followers in the anthropological literature. Wasson and his co-author, Wendy Doniger O'Flaherty, drew parallels between Vedic descriptions and reports of Siberian uses of the fly-agaric in shamanic ritual.