Petrophyton (Paperback)

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. High Quality Content by WIKIPEDIA articles Petrophyton (orth. var. Petrophytum) is a small genus of plants in the rose family known as the rock spiraeas or rockmats. These are low mat-forming shrubs which send up erect stems bearing spike inflorescences of flowers. The brushy flowers are white and have many stamens and hairy, thready pistils. Rockmats are native to western North America. The Rosaceae or rose family is a large family of flowering plants, with about 2830 species in 95 genera. The name is derived from the type genus Rosa. Among the largest genera are Alchemilla (270), Sorbus (260), Crataegus (260), Cotoneaster(260), and Rubus (250). The largest genus by far is Prunus (plums, cherries, peaches, apricots and almonds) with about 430 species. However, all of these numbers should be seen as underestimates - much taxonomic work is left to be done here.