Plumeria

Plumeria is related to the Oleander, Nerium oleander, and both possess poisonous, milky sap, rather similar to that of Euphorbia.
Plumeria flowers are most fragrant at night in order to lure sphinx moths to pollinate them. The flowers have no nectar, and simply dupe their pollinators. The moths inadvertently pollinate them by transferring pollen from flower to flower in their fruitless search for nectar.