Dudleya is a genus of succulent perennials, consisting of about 45 species in southwest North America and are very valuable in countries like Japan, China and Korea, selling for around $50 each, The Tribune reports.
Authorities estimate the plants' market value at more than $90,000.
Experts have replanted the plants in the areas they were removed from.
"We have seen a remarkable amount of concern over this from botanists and the public alike," said David Bess, the state Department of Fish and Wildlife Deputy Director and Chief of Law Enforcement, in a news release. "A public tip started this investigation and ultimately uncovered an international conspiracy to poach Dudleya succulents and ship them overseas for profit."