22 sek.
Lophophora williamsii (Lemaire ex Salm-Dyck) J. M. Coulter
The plants are blue-green, usually with well-defined ribs and furrows. The tufts of hair are usually equally spaced on the ribs. The flowers are pinkish or rarely whitish. L. williamsii occurs in the full range of the genus except in Querétaro state, Mexico.
The mescaline content in dried L. williamsii can reach 6%.
Synonyms
Echinocactus williamsii Lemaire ex Salm-Dyck 1845
Lophophora lewinii (K. Schumann) Rusby 1894
Lophophora echinata Croizat 1944
Lophophora fricii Habermann 1974, L. williamsii var. fricii (Habermann) Grym 1997, L. diffusa subsp. fricii (Habermann) Halda 1997
Lophophora jourdaniana Habermann 1975 One curious and under-reported observation is that these cacti have thigmotactic anthers. This means that as its anthers are touched they curl over, depositing their pollen. This movement can be seen by gently poking the anthers of an open Lophophora flower. Thus one of the slowest growing plants in the world makes one of the fastest plant movements!
Her fra.
http://en.wikipedia.org/wiki/Lophophora