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).