RT Journal Article SR Electronic T1 Conservation of Species by Protective Marking JF Native Plants Journal JO NATIVE PLANTS JOURNAL FD University of Wisconsin Press SP 98 OP 99 VO 3 IS 2 A1 Corbin, James Edward YR 2002 UL http://npj.uwpress.org/content/3/2/98.abstract AB A variety of marking systems including steel ribbons, dyes, and silicon chips are being used to deter illegal harvesting of medicinal plants.