Extracts from crepe jasmine, Tabernaemontana divaricata, have long been used in traditional medicine, but how this particular compound alleviates pain remains a puzzle.

Fritz Muller also states that a species of Bignonia and Tabernaemontana echinata are both sterile with their own pollen in their native country of Brazil.

Fritz Muller tried both kinds of self-fertilisation in the case of Bignonia, Tabernaemontana and Abutilon, likewise with no difference in the result.