Releasing rare plant locality data

[Michael.Chamberland]

Herbarium collections contain precise locality data for rare plant
species.  I am curious what sorts of policies herbaria have
established for dealing with requests by the general public to
access these specimens and/or this locality data.  In particular
what appoach should be taken if the plants in question are species
know to be desirable to collectors, such as species of Calypso,
Cypripedium, Sarracenia, Nepenthes, Pediocactus, Sclerocactus,
Lophophora, or Cannabis?  How is this dealt with when herbarium
databases are available over the internet?

Michael Chamberland
Beal-Darlington Herbarium
Michigan State University