Original sentence: Rhubarb belongs to genus Rheum in the family Polygonaceae.They are perennial plants growing from thick short rhizomes, and large leaves that are somewhat triangular shaped with long fleshy petioles
Edited sentence: Rhubarb is a  group of plants that belong to  the genus Rheum in the family Polygonaceae.They are perennial plants that grow from thick short rhizomes, and have large leaves that are somewhat triangular shaped with long fleshy petioles