Query of herbarium records for elevation and location of
species-rich plant families
For herbarium data, we queried the Global Biodiversity Information
Facility; Naturalis Biodiversity
Center; and a Mt Kinabalu regional dataset. We defined species-rich
families as ≥75 species with two or more herbarium records, making an
exception for Podocarpaceae as the sole Gymnosperm. We defined species
occurrence by biogeographic regions within Malesia, based on van Welzenet al. , 2011, with Sundaland representing Sumatra, Malay
Peninsula, and Borneo; Wallacea as Java, Sulawesi, Maluku, the Lesser
Sunda Isles, and the Philippines; and Sahul as New Guinea, excluding the
Bismarck Archipelago or Australia. Alternate biogeographic delineations
were also examined (e.g. affiliation for Java, Palawan, Bali), producing
comparable results (see Supporting information).