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Order Gentianales

The Gentianales is an order of 6 families and around 5500 species of flowering plants including the Apocynaceae (periwinkle family), Gentianaceae (gentian family) Loganiaceae (strychnine family), Oleaceae (olive family) Rubiaceae (gardenia, coffee and quinine family).
 
Leaves of Gentianales are opposite and internal phloem is within the wood (but not in Rubiaceae). Many species contain alkaloids, some of which are very toxic and others widely used in beverages or as medicinal drugs. Most of the succulent species are found within the Apocynaceae, including the Asclepiadaceae which generally have a milky sap containing latex and vaious alkaloids. 		 

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