Subclass Rosidaetakhtajan 1966

The subclass Rosidae is a large group which consists of 18 orders, 114 families, and about 58000 species of trees, shrubs, herbs and climbers thought to have originated from the subclass Magnoliidae in the early Upper Cretaceous period (Appendix I). The chemical weapons used by Rosidae, especially the primitive ones, are hydrolyzable tannins inherited from Magnoliidae. Other noticeable secondary metabolites of Rosidae are cyanogen glycosides, triterpenes, alkaloids and iridoids.The leaves of Rosidae are pinnate, serrate, and stipulate. The flowers include a definite number of sepals and petals which are free and inserted in a nectary disc from which several stamens develop, initiating a centripetal sequence. The ovary in Rosidae comprises of 2 to several locules, containing 1 or 2 ovules per locule. Countless plant species from the Rosidae prove to be useful agricultural and pharmaceutical products. The order Rosales is the most archaic order of Rosidae and is a common ancestor to all other orders in this subclass.

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