@book {2873, title = {Taxonomy of Vascular Plants}, year = {1951}, publisher = {Macmillan}, organization = {Macmillan}, address = {New York}, keywords = {CLASSIFICATION, TAXONOMY}, author = {Lawrence} } @article {2104, title = {Dillon S.L. (2007)}, journal = {Plant Systematics and Evolution}, volume = {268}, year = {2007}, pages = {29-43}, keywords = {EVOLUTION, Sarga, Sorghum, Sorghum; Sarga; Vacoparis, SYSTEMATICS, Vacoparis}, author = {Dillon, S.L., and Lawrence and Henry, R.J., and Price,H.J.} }