A system of plant taxonomy, the Takhtajan system of plant classification was published by Armen Takhtajan, in several versions from the 1950's onwards. It is usually compared to the Cronquist system. Key publications:

• A. Takhtajan (in Russian, 1966). A system and phylogeny of the flowering plants. 
• A. Takhtajan (1969, transl. from Russian by C. Jeffrey). Flowering plants: origin and dispersal. 
• A. Takhtajan (1980). "Outline of the classification of flowering plants (Magnoliophya)". Botanical Review 46: 225–359. doi:10.1007/BF02861558. 

External links:

Takhtajan system at CSDL, Texas. Also at the Norton Brown Herbarium, Maryland (with an extensive listing of synonyms, both nomenclatural and taxonomic, for each name in the system): 1, 2, 3