Subclass Magnoliidae Takhtajan 1966

The Magnoliidae consists of 8 orders, 39 families and about 12 000 species of primitive trees, shrubs or woody climbers confined in primary rainforests. The flowers of Magnoli-dae are often large, and made up of an indefinite number of free carpels, stamens, petals and sepals. The orders Magnoliales, Laurales and Ranunculales make up more than two-thirds of the species of Mag-noliidae. The chemical weapons used here are isoquinoline alkaloids which bind to protein receptors of neurones and impede or promote neurotransmission. Besides, isoquinolines are amphiphile and penetrate bacteria wherein are inactivated enzymes and

DNA. The ability of alkaloids to bind to cellular receptors often explains the medicinal and toxic properties of plants and their pharmaceutical interest.

Continue reading here: Order Magnoliales Bromhead 1838

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