Allamanda cathartica, Golden Trumpet
A stamp issued by Tanzania in 1994
I have only seen this plant once, in the Botanical Garden at Lucca.
However, I have stamps featuring the same plant from Cuba and Singapore.
Allamanda cathartica is mentioned in
SOME CLIMBING PLANTS FOR THE MIDI, FRANCE
By Members of the Languedoc Branch
THE MEDITERRANEAN GARDEN number 56 April 2009