Tonkin,. Province de Thai Nguyen, Vietnam, Asia-Tropical
Specimen annotated by K.E. Rogers (1968) as "holotype" but protologue designates Balansa 443 as the type collection (holotype: L). This collection is surely a paratype, (mis?) cited in protologue as "1746" but number on label appears to be 4746; locality on label matches locality cited.
"This is neither the holotype nor the paratype of I. tonkinensis."