pThis fourth volume describes 256 species of medicinal plants from 5 families, which are commonly used in Chinese medicine. The most important species are Agrimonia pilosa, Amygdalus persica, Armeniaca mume, Armeniaca vulgaris, Armeniaca sibirica, Chaenomeles sinensis, Eriobotrya japonica of Rosaceae Chimonanthus praecox of Calycanthaceae65307Albizia julibrissin, Archidendron clypearia, Entada phaseoloides, Bauhinia championii of Mimosoideae Caesalpinia sappan, Cassia tora, Gleditsia sinensis of Caesalpiniaceae Abrus cantoniensis, Astragalus membranaceus, Astragalus membranaceus, Dalbergia odorifera, Desmodium caudatum, Desmodium styracifolium, Erythrina variegata, Euchresta japonica, Flemingia prostrata, Glycyrrhiza uralensis, Glycyrrhiza inflata, Glycyrrhiza glabra, Lablab purpureus, Sophora japonica and Spatholobus suberectus of Butterflyaceae.p In each specie, it introduces the scientific names, medicinal names, morphologies, habitats, distributions, acquisition and processing meth