The giant grass Arundo donax is a tall, perennial reed of a bamboo-like nature. A number of studies have found this plant to be a rich tryptamine source. Almost all the published reports have located these alkaloids in the flowers or in the roots of the plant. The blossoms have both DMT and the 5-methoxylated N-demethylated analogue, 5-MeO-NMT. The roots are a rhizomal system and they not only contain these active tryptamines, but bufotenine as well. The quaternary methylated salt of DMT is in the flowers, and bufotenidine and the cyclic dehydrobufotenidine are in the roots. Another report puts 5-MeO-DMT in all the plant's extracts.