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In page Rutaceae:

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Most species are trees or shrubs, a few are herbs (the type genus Ruta, Boenninghausenia, and Dictamnus), frequently aromatic with glands on the leaves, sometimes with thorns. The leaves are usually opposed and compound and without stipules. Pellucid glands, a type of oil gland, are found in the leaves responsible for the aromatic smell of the family's members; traditionally they have been the primary synapomorphic characteristic to identify the Rutaceae.[citation needed]