Herb genus is a term used to describe a group of plants that share similar characteristics. The five herb genera mentioned in the crossword solutions are GEUM (4 letters), Iva (3 letters), Musa (4 letters), Sedum (5 letters) and Nerine (6 letters). GEUM is a genus of flowering plants in the rose family, native to Europe, Asia, North America and South Africa. Iva is a genus of flowering plants in the daisy family, native to North and South America. Musa is a genus of flowering plants in the banana family, native to tropical and subtropical regions of the world. Sedum is a genus of flowering plants in the stonecrop family, native to Europe, Asia, North America and South Africa. Nerine is a genus of flowering plants in the amaryllis family, native to South Africa.