Sentence:  The commonest and most conspicuous of the cacti is the "<WSD>dildoe</WSD>" (Cereus Swartzii), a columnar form growing to as much as 20 feet in height, a plant the gross physiology of which is probably very similar to that of the sahuaro (Camegiea gigantea). 
Meaning of the word marked with <WSD> tags:  A columnar cactaceous plant of the West Indies ((noshow=1)).