In retirement he returned to Indonesia with Betty, teaching at Gadjah Mada University in Jakarta and Andalas University in West Sumatra, again on local salaries.
The herbarium specimen A.Primaldhi & M.Hambali DivNep052 is the designated holotype, and is deposited at the herbarium of Andalas University (ANDA), near Pandang, West Sumatra.
Both are deposited at the Herbarium of Andalas University in Padang, West Sumatra and appear to represent N. sumatrana.
Andalas University historian, Prof. Gusti Asnan suggests that rendang began to spread across the region when Minangkabau merchants and migrant workers began to trade and migrate to Malacca in the 16th century.
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