@article {180, title = {Diagnostic evidence from DELTA and clustering programs, and an INTKEY package for interactive, illustrated identification and information retrieval}, journal = {Can J Botany}, volume = {75}, year = {1997}, pages = {1527-55}, author = {Aiken, S. G. and Dallwitz, M. J. and McJannet, C. L. and Consaul, L.} }