This sixth volume describes 226 species of 32 families of medicinal plants, which are commonly used in Chinese medicine. The most important species are Aquilaria sinensis and Daphne genkwa of Thymelaeaceae; Benincasa hispida, Siraitia grosvenorii, Trichosanthes kirilowii and Trichosanthes rosthornii of Cucurbitaceae; Camellia sinensis of Theaceae; Cleistocalyx operculatus, Eugenia caryophyllata and Rhodomyrtus tomentosa of Myrtaceae; Osbeckia chinensis of Melastomataceae; Quisqualis indica and Terminalia chebula of Combretaceae; Hypericum japonicum of Hypericaceae; Microcos paniculata of Tiliaceae; Hibiscus mutabilis of Malvaceae; Croton crassifolius, C. lachnocarpus, C. tiglium, Euphorbia humifusa, E. lathyris, E. pekinensis, Phyllanthus emblica and Sauropus spatulifolius of Euphorbiaceae.