pope's head
/ˈpəʊps hɛd/noun
Chiefly Caribbean. Any of several melon cacti (genus Melocactus), which bear their flowers on a woolly terminal structure; especially M. intortus, a native of the West Indies (also called Turk's cap, Turk's head).
Origin
Late 17th century; earliest use found in Lionel Wafer (d. 1705), surgeon and buccaneer. From the genitive of pope + head.