Volume 19 of the illustrations series encompasses 20 plantfamilies， among them： Rubiaceae， the madder family， with Coffeaarabica， the coffee tree， Gardenia jasminoides， the beautifulgardenia， Cinchona pubescens， source of quinine， and many othernotable species; Acanthaceae， with species of horticultural andmedicinal value， e.g.， Barleria cristata; Plantaginaceae， includingPlantago arenaria， cultivated for its medicinal seeds;Campanulaceae， known for its garden plants with often blue，bell-shaped flowers， among the most striking， Campanula glomerata，the clustered bellflower， and Lobelia chinensis， one of thefundamental herbs of Chinese medicine; Adoxaceae， containing thegenus Viburnum， with its berries and flowers; Caprifoliaceae，including the genus Lonicera， the honeysuckle; Dipsacaceae， theteasel family; Valerianaceae， whose garlands of fragrant Valerianathe great Chinese poet of the third and fourth centuries BC ChuYuan described in his autobiographical poem "Li Sao"; Annonaceae，the custard apple family; and Berberidaceae， the barberry family，with its decorative， edible berries.
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