This ninth volume describes 285 species of medicinal plants of 30 families, which are commonly used in Chinese medicine. The most important species are Alisma orientale of Alismaceae; Commelina communis of Commelinaceae; Eriocaulon buergerianum of Eriocaulaceae; Alpinia galanga, Alpinia hainanensis, Alpinia officinarum, Alpinia oxyphylla, Amomum compactum, Amomum kravanh, Amomum villosum, Amomum villosum var.