RIP. He was (perhaps unknowingly) a great friend of my country. The Missouri Botanical Garden (under his leadership) helped a lot to help and increase the Paraguayan Herbarium collection at the Chair of Botany of the Faculty of Chemical Sciences, National University of Asunción back in the 1990s, and perhaps this association was sustained over the years. The botanists there looked up to the MBG as the landmark and example of how botany should be done.
(Some might wonder why a chemistry school has a botany department. Well, that school taught pharmacy since the 1930s and pharmacists use plants as medicines so yes, botany was part of the core school activities right from the beginning...)