Linnaeus made one of the earliest collections that survives. Find some plant vouchers that Linnaeus made.
Joseph Rock was a famous botanist in Hawai`i (and an early faculty member at the University of Hawai`i). The Botany Department's herbarium has been named after him, too. Find some of his voucher specimens.
Harold St. John (after whom the building is named) was an avid plant collector for many, many years. Find something of his.
Hints and Suggestions
Look at a type voucher at the Clifford Herbarium by searching for Panicum (a grass)
Look in the Sloane Herbarium for Theobroma (chocolate, the first specimen to reach Europe)
Check the Bishop Museum for specimens related to Joseph by entering "rockii".